Split shading rendering code into its own file.
Move shading code, which makes up 1/3 of cpdf_renderstatus.cpp, into
cpdf_rendershading.cpp.
Change-Id: Idc8c5456aa3e1209630177ef210a8653b0b0f181
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61030
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/core/fpdfapi/render/BUILD.gn b/core/fpdfapi/render/BUILD.gn
index 8378de6..d7cc9b6 100644
--- a/core/fpdfapi/render/BUILD.gn
+++ b/core/fpdfapi/render/BUILD.gn
@@ -30,6 +30,8 @@
"cpdf_rendercontext.h",
"cpdf_renderoptions.cpp",
"cpdf_renderoptions.h",
+ "cpdf_rendershading.cpp",
+ "cpdf_rendershading.h",
"cpdf_renderstatus.cpp",
"cpdf_renderstatus.h",
"cpdf_scaledrenderbuffer.cpp",
diff --git a/core/fpdfapi/render/cpdf_rendershading.cpp b/core/fpdfapi/render/cpdf_rendershading.cpp
new file mode 100644
index 0000000..0ac8043
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_rendershading.cpp
@@ -0,0 +1,954 @@
+// Copyright 2019 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fpdfapi/render/cpdf_rendershading.h"
+
+#include <algorithm>
+#include <array>
+#include <cmath>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "core/fpdfapi/page/cpdf_colorspace.h"
+#include "core/fpdfapi/page/cpdf_dibbase.h"
+#include "core/fpdfapi/page/cpdf_function.h"
+#include "core/fpdfapi/page/cpdf_meshstream.h"
+#include "core/fpdfapi/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_stream.h"
+#include "core/fpdfapi/parser/fpdf_parser_utility.h"
+#include "core/fpdfapi/render/cpdf_devicebuffer.h"
+#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "core/fxcrt/fx_system.h"
+#include "core/fxge/cfx_defaultrenderdevice.h"
+#include "core/fxge/dib/cfx_dibitmap.h"
+#include "core/fxge/fx_dib.h"
+
+namespace {
+
+constexpr int kShadingSteps = 256;
+
+uint32_t CountOutputsFromFunctions(
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs) {
+ FX_SAFE_UINT32 total = 0;
+ for (const auto& func : funcs) {
+ if (func)
+ total += func->CountOutputs();
+ }
+ return total.ValueOrDefault(0);
+}
+
+uint32_t GetValidatedOutputsCount(
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS) {
+ uint32_t funcs_outputs = CountOutputsFromFunctions(funcs);
+ return funcs_outputs ? std::max(funcs_outputs, pCS->CountComponents()) : 0;
+}
+
+std::array<FX_ARGB, kShadingSteps> GetShadingSteps(
+ float t_min,
+ float t_max,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ int alpha,
+ size_t results_count) {
+ ASSERT(results_count >= CountOutputsFromFunctions(funcs));
+ ASSERT(results_count >= pCS->CountComponents());
+ std::array<FX_ARGB, kShadingSteps> shading_steps;
+ std::vector<float> result_array(results_count);
+ float diff = t_max - t_min;
+ for (int i = 0; i < kShadingSteps; ++i) {
+ float input = diff * i / kShadingSteps + t_min;
+ int offset = 0;
+ for (const auto& func : funcs) {
+ if (func) {
+ int nresults = 0;
+ if (func->Call(&input, 1, &result_array[offset], &nresults))
+ offset += nresults;
+ }
+ }
+ float R = 0.0f;
+ float G = 0.0f;
+ float B = 0.0f;
+ pCS->GetRGB(result_array.data(), &R, &G, &B);
+ shading_steps[i] =
+ FXARGB_TODIB(ArgbEncode(alpha, FXSYS_roundf(R * 255),
+ FXSYS_roundf(G * 255), FXSYS_roundf(B * 255)));
+ }
+ return shading_steps;
+}
+
+void DrawAxialShading(const RetainPtr<CFX_DIBitmap>& pBitmap,
+ const CFX_Matrix& mtObject2Bitmap,
+ const CPDF_Dictionary* pDict,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ int alpha) {
+ ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
+
+ const uint32_t total_results = GetValidatedOutputsCount(funcs, pCS);
+ if (total_results == 0)
+ return;
+
+ const CPDF_Array* pCoords = pDict->GetArrayFor("Coords");
+ if (!pCoords)
+ return;
+
+ float start_x = pCoords->GetNumberAt(0);
+ float start_y = pCoords->GetNumberAt(1);
+ float end_x = pCoords->GetNumberAt(2);
+ float end_y = pCoords->GetNumberAt(3);
+ float t_min = 0;
+ float t_max = 1.0f;
+ const CPDF_Array* pArray = pDict->GetArrayFor("Domain");
+ if (pArray) {
+ t_min = pArray->GetNumberAt(0);
+ t_max = pArray->GetNumberAt(1);
+ }
+ pArray = pDict->GetArrayFor("Extend");
+ const bool bStartExtend = pArray && pArray->GetBooleanAt(0, false);
+ const bool bEndExtend = pArray && pArray->GetBooleanAt(1, false);
+
+ int width = pBitmap->GetWidth();
+ int height = pBitmap->GetHeight();
+ float x_span = end_x - start_x;
+ float y_span = end_y - start_y;
+ float axis_len_square = (x_span * x_span) + (y_span * y_span);
+
+ std::array<FX_ARGB, kShadingSteps> shading_steps =
+ GetShadingSteps(t_min, t_max, funcs, pCS, alpha, total_results);
+
+ int pitch = pBitmap->GetPitch();
+ CFX_Matrix matrix = mtObject2Bitmap.GetInverse();
+ for (int row = 0; row < height; row++) {
+ uint32_t* dib_buf =
+ reinterpret_cast<uint32_t*>(pBitmap->GetBuffer() + row * pitch);
+ for (int column = 0; column < width; column++) {
+ CFX_PointF pos = matrix.Transform(
+ CFX_PointF(static_cast<float>(column), static_cast<float>(row)));
+ float scale =
+ (((pos.x - start_x) * x_span) + ((pos.y - start_y) * y_span)) /
+ axis_len_square;
+ int index = (int32_t)(scale * (kShadingSteps - 1));
+ if (index < 0) {
+ if (!bStartExtend)
+ continue;
+
+ index = 0;
+ } else if (index >= kShadingSteps) {
+ if (!bEndExtend)
+ continue;
+
+ index = kShadingSteps - 1;
+ }
+ dib_buf[column] = shading_steps[index];
+ }
+ }
+}
+
+void DrawRadialShading(const RetainPtr<CFX_DIBitmap>& pBitmap,
+ const CFX_Matrix& mtObject2Bitmap,
+ const CPDF_Dictionary* pDict,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ int alpha) {
+ ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
+
+ const uint32_t total_results = GetValidatedOutputsCount(funcs, pCS);
+ if (total_results == 0)
+ return;
+
+ const CPDF_Array* pCoords = pDict->GetArrayFor("Coords");
+ if (!pCoords)
+ return;
+
+ float start_x = pCoords->GetNumberAt(0);
+ float start_y = pCoords->GetNumberAt(1);
+ float start_r = pCoords->GetNumberAt(2);
+ float end_x = pCoords->GetNumberAt(3);
+ float end_y = pCoords->GetNumberAt(4);
+ float end_r = pCoords->GetNumberAt(5);
+ float t_min = 0;
+ float t_max = 1.0f;
+ const CPDF_Array* pArray = pDict->GetArrayFor("Domain");
+ if (pArray) {
+ t_min = pArray->GetNumberAt(0);
+ t_max = pArray->GetNumberAt(1);
+ }
+ pArray = pDict->GetArrayFor("Extend");
+ const bool bStartExtend = pArray && pArray->GetBooleanAt(0, false);
+ const bool bEndExtend = pArray && pArray->GetBooleanAt(1, false);
+
+ std::array<FX_ARGB, kShadingSteps> shading_steps =
+ GetShadingSteps(t_min, t_max, funcs, pCS, alpha, total_results);
+
+ const float dx = end_x - start_x;
+ const float dy = end_y - start_y;
+ const float dr = end_r - start_r;
+ const float a = dx * dx + dy * dy - dr * dr;
+ const bool a_is_float_zero = IsFloatZero(a);
+
+ int width = pBitmap->GetWidth();
+ int height = pBitmap->GetHeight();
+ int pitch = pBitmap->GetPitch();
+
+ bool bDecreasing =
+ (dr < 0 && static_cast<int>(sqrt(dx * dx + dy * dy)) < -dr);
+
+ CFX_Matrix matrix = mtObject2Bitmap.GetInverse();
+ for (int row = 0; row < height; row++) {
+ uint32_t* dib_buf =
+ reinterpret_cast<uint32_t*>(pBitmap->GetBuffer() + row * pitch);
+ for (int column = 0; column < width; column++) {
+ CFX_PointF pos = matrix.Transform(
+ CFX_PointF(static_cast<float>(column), static_cast<float>(row)));
+ float pos_dx = pos.x - start_x;
+ float pos_dy = pos.y - start_y;
+ float b = -2 * (pos_dx * dx + pos_dy * dy + start_r * dr);
+ float c = pos_dx * pos_dx + pos_dy * pos_dy - start_r * start_r;
+ float s;
+ if (IsFloatZero(b)) {
+ s = sqrt(-c / a);
+ } else if (a_is_float_zero) {
+ s = -c / b;
+ } else {
+ float b2_4ac = (b * b) - 4 * (a * c);
+ if (b2_4ac < 0)
+ continue;
+
+ float root = sqrt(b2_4ac);
+ float s1 = (-b - root) / (2 * a);
+ float s2 = (-b + root) / (2 * a);
+ if (a <= 0)
+ std::swap(s1, s2);
+ if (bDecreasing)
+ s = (s1 >= 0 || bStartExtend) ? s1 : s2;
+ else
+ s = (s2 <= 1.0f || bEndExtend) ? s2 : s1;
+
+ if (start_r + s * dr < 0)
+ continue;
+ }
+
+ int index = static_cast<int32_t>(s * (kShadingSteps - 1));
+ if (index < 0) {
+ if (!bStartExtend)
+ continue;
+ index = 0;
+ } else if (index >= kShadingSteps) {
+ if (!bEndExtend)
+ continue;
+ index = kShadingSteps - 1;
+ }
+ dib_buf[column] = shading_steps[index];
+ }
+ }
+}
+
+void DrawFuncShading(const RetainPtr<CFX_DIBitmap>& pBitmap,
+ const CFX_Matrix& mtObject2Bitmap,
+ const CPDF_Dictionary* pDict,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ int alpha) {
+ ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
+
+ const uint32_t total_results = GetValidatedOutputsCount(funcs, pCS);
+ if (total_results == 0)
+ return;
+
+ const CPDF_Array* pDomain = pDict->GetArrayFor("Domain");
+ float xmin = 0.0f;
+ float ymin = 0.0f;
+ float xmax = 1.0f;
+ float ymax = 1.0f;
+ if (pDomain) {
+ xmin = pDomain->GetNumberAt(0);
+ xmax = pDomain->GetNumberAt(1);
+ ymin = pDomain->GetNumberAt(2);
+ ymax = pDomain->GetNumberAt(3);
+ }
+ CFX_Matrix mtDomain2Target = pDict->GetMatrixFor("Matrix");
+ CFX_Matrix matrix =
+ mtObject2Bitmap.GetInverse() * mtDomain2Target.GetInverse();
+ int width = pBitmap->GetWidth();
+ int height = pBitmap->GetHeight();
+ int pitch = pBitmap->GetPitch();
+
+ ASSERT(total_results >= CountOutputsFromFunctions(funcs));
+ ASSERT(total_results >= pCS->CountComponents());
+ std::vector<float> result_array(total_results);
+ for (int row = 0; row < height; ++row) {
+ uint32_t* dib_buf = (uint32_t*)(pBitmap->GetBuffer() + row * pitch);
+ for (int column = 0; column < width; column++) {
+ CFX_PointF pos = matrix.Transform(
+ CFX_PointF(static_cast<float>(column), static_cast<float>(row)));
+ if (pos.x < xmin || pos.x > xmax || pos.y < ymin || pos.y > ymax)
+ continue;
+
+ float input[] = {pos.x, pos.y};
+ int offset = 0;
+ for (const auto& func : funcs) {
+ if (func) {
+ int nresults;
+ if (func->Call(input, 2, &result_array[offset], &nresults))
+ offset += nresults;
+ }
+ }
+
+ float R = 0.0f;
+ float G = 0.0f;
+ float B = 0.0f;
+ pCS->GetRGB(result_array.data(), &R, &G, &B);
+ dib_buf[column] = FXARGB_TODIB(ArgbEncode(
+ alpha, (int32_t)(R * 255), (int32_t)(G * 255), (int32_t)(B * 255)));
+ }
+ }
+}
+
+bool GetScanlineIntersect(int y,
+ const CFX_PointF& first,
+ const CFX_PointF& second,
+ float* x) {
+ if (first.y == second.y)
+ return false;
+
+ if (first.y < second.y) {
+ if (y < first.y || y > second.y)
+ return false;
+ } else if (y < second.y || y > first.y) {
+ return false;
+ }
+ *x = first.x + ((second.x - first.x) * (y - first.y) / (second.y - first.y));
+ return true;
+}
+
+void DrawGouraud(const RetainPtr<CFX_DIBitmap>& pBitmap,
+ int alpha,
+ CPDF_MeshVertex triangle[3]) {
+ float min_y = triangle[0].position.y;
+ float max_y = triangle[0].position.y;
+ for (int i = 1; i < 3; i++) {
+ min_y = std::min(min_y, triangle[i].position.y);
+ max_y = std::max(max_y, triangle[i].position.y);
+ }
+ if (min_y == max_y)
+ return;
+
+ int min_yi = std::max(static_cast<int>(floor(min_y)), 0);
+ int max_yi = static_cast<int>(ceil(max_y));
+
+ if (max_yi >= pBitmap->GetHeight())
+ max_yi = pBitmap->GetHeight() - 1;
+
+ for (int y = min_yi; y <= max_yi; y++) {
+ int nIntersects = 0;
+ float inter_x[3];
+ float r[3];
+ float g[3];
+ float b[3];
+ for (int i = 0; i < 3; i++) {
+ CPDF_MeshVertex& vertex1 = triangle[i];
+ CPDF_MeshVertex& vertex2 = triangle[(i + 1) % 3];
+ CFX_PointF& position1 = vertex1.position;
+ CFX_PointF& position2 = vertex2.position;
+ bool bIntersect =
+ GetScanlineIntersect(y, position1, position2, &inter_x[nIntersects]);
+ if (!bIntersect)
+ continue;
+
+ float y_dist = (y - position1.y) / (position2.y - position1.y);
+ r[nIntersects] = vertex1.r + ((vertex2.r - vertex1.r) * y_dist);
+ g[nIntersects] = vertex1.g + ((vertex2.g - vertex1.g) * y_dist);
+ b[nIntersects] = vertex1.b + ((vertex2.b - vertex1.b) * y_dist);
+ nIntersects++;
+ }
+ if (nIntersects != 2)
+ continue;
+
+ int min_x, max_x, start_index, end_index;
+ if (inter_x[0] < inter_x[1]) {
+ min_x = (int)floor(inter_x[0]);
+ max_x = (int)ceil(inter_x[1]);
+ start_index = 0;
+ end_index = 1;
+ } else {
+ min_x = (int)floor(inter_x[1]);
+ max_x = (int)ceil(inter_x[0]);
+ start_index = 1;
+ end_index = 0;
+ }
+
+ int start_x = std::max(min_x, 0);
+ int end_x = max_x;
+ if (end_x > pBitmap->GetWidth())
+ end_x = pBitmap->GetWidth();
+
+ uint8_t* dib_buf =
+ pBitmap->GetBuffer() + y * pBitmap->GetPitch() + start_x * 4;
+ float r_unit = (r[end_index] - r[start_index]) / (max_x - min_x);
+ float g_unit = (g[end_index] - g[start_index]) / (max_x - min_x);
+ float b_unit = (b[end_index] - b[start_index]) / (max_x - min_x);
+ float R = r[start_index] + (start_x - min_x) * r_unit;
+ float G = g[start_index] + (start_x - min_x) * g_unit;
+ float B = b[start_index] + (start_x - min_x) * b_unit;
+ for (int x = start_x; x < end_x; x++) {
+ R += r_unit;
+ G += g_unit;
+ B += b_unit;
+ FXARGB_SETDIB(dib_buf,
+ ArgbEncode(alpha, (int32_t)(R * 255), (int32_t)(G * 255),
+ (int32_t)(B * 255)));
+ dib_buf += 4;
+ }
+ }
+}
+
+void DrawFreeGouraudShading(
+ const RetainPtr<CFX_DIBitmap>& pBitmap,
+ const CFX_Matrix& mtObject2Bitmap,
+ const CPDF_Stream* pShadingStream,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ int alpha) {
+ ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
+
+ CPDF_MeshStream stream(kFreeFormGouraudTriangleMeshShading, funcs,
+ pShadingStream, pCS);
+ if (!stream.Load())
+ return;
+
+ CPDF_MeshVertex triangle[3];
+ memset(triangle, 0, sizeof(triangle));
+
+ while (!stream.BitStream()->IsEOF()) {
+ CPDF_MeshVertex vertex;
+ uint32_t flag;
+ if (!stream.ReadVertex(mtObject2Bitmap, &vertex, &flag))
+ return;
+
+ if (flag == 0) {
+ triangle[0] = vertex;
+ for (int j = 1; j < 3; j++) {
+ uint32_t tflag;
+ if (!stream.ReadVertex(mtObject2Bitmap, &triangle[j], &tflag))
+ return;
+ }
+ } else {
+ if (flag == 1)
+ triangle[0] = triangle[1];
+
+ triangle[1] = triangle[2];
+ triangle[2] = vertex;
+ }
+ DrawGouraud(pBitmap, alpha, triangle);
+ }
+}
+
+void DrawLatticeGouraudShading(
+ const RetainPtr<CFX_DIBitmap>& pBitmap,
+ const CFX_Matrix& mtObject2Bitmap,
+ const CPDF_Stream* pShadingStream,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ int alpha) {
+ ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
+
+ int row_verts = pShadingStream->GetDict()->GetIntegerFor("VerticesPerRow");
+ if (row_verts < 2)
+ return;
+
+ CPDF_MeshStream stream(kLatticeFormGouraudTriangleMeshShading, funcs,
+ pShadingStream, pCS);
+ if (!stream.Load())
+ return;
+
+ std::vector<CPDF_MeshVertex> vertices[2];
+ vertices[0] = stream.ReadVertexRow(mtObject2Bitmap, row_verts);
+ if (vertices[0].empty())
+ return;
+
+ int last_index = 0;
+ while (1) {
+ vertices[1 - last_index] = stream.ReadVertexRow(mtObject2Bitmap, row_verts);
+ if (vertices[1 - last_index].empty())
+ return;
+
+ CPDF_MeshVertex triangle[3];
+ for (int i = 1; i < row_verts; ++i) {
+ triangle[0] = vertices[last_index][i];
+ triangle[1] = vertices[1 - last_index][i - 1];
+ triangle[2] = vertices[last_index][i - 1];
+ DrawGouraud(pBitmap, alpha, triangle);
+ triangle[2] = vertices[1 - last_index][i];
+ DrawGouraud(pBitmap, alpha, triangle);
+ }
+ last_index = 1 - last_index;
+ }
+}
+
+struct Coon_BezierCoeff {
+ float a, b, c, d;
+ void FromPoints(float p0, float p1, float p2, float p3) {
+ a = -p0 + 3 * p1 - 3 * p2 + p3;
+ b = 3 * p0 - 6 * p1 + 3 * p2;
+ c = -3 * p0 + 3 * p1;
+ d = p0;
+ }
+ Coon_BezierCoeff first_half() {
+ Coon_BezierCoeff result;
+ result.a = a / 8;
+ result.b = b / 4;
+ result.c = c / 2;
+ result.d = d;
+ return result;
+ }
+ Coon_BezierCoeff second_half() {
+ Coon_BezierCoeff result;
+ result.a = a / 8;
+ result.b = 3 * a / 8 + b / 4;
+ result.c = 3 * a / 8 + b / 2 + c / 2;
+ result.d = a / 8 + b / 4 + c / 2 + d;
+ return result;
+ }
+ void GetPoints(float p[4]) {
+ p[0] = d;
+ p[1] = c / 3 + p[0];
+ p[2] = b / 3 - p[0] + 2 * p[1];
+ p[3] = a + p[0] - 3 * p[1] + 3 * p[2];
+ }
+ void GetPointsReverse(float p[4]) {
+ p[3] = d;
+ p[2] = c / 3 + p[3];
+ p[1] = b / 3 - p[3] + 2 * p[2];
+ p[0] = a + p[3] - 3 * p[2] + 3 * p[1];
+ }
+ void BezierInterpol(Coon_BezierCoeff& C1,
+ Coon_BezierCoeff& C2,
+ Coon_BezierCoeff& D1,
+ Coon_BezierCoeff& D2) {
+ a = (D1.a + D2.a) / 2;
+ b = (D1.b + D2.b) / 2;
+ c = (D1.c + D2.c) / 2 - (C1.a / 8 + C1.b / 4 + C1.c / 2) +
+ (C2.a / 8 + C2.b / 4) + (-C1.d + D2.d) / 2 - (C2.a + C2.b) / 2;
+ d = C1.a / 8 + C1.b / 4 + C1.c / 2 + C1.d;
+ }
+ float Distance() {
+ float dis = a + b + c;
+ return dis < 0 ? -dis : dis;
+ }
+};
+
+struct Coon_Bezier {
+ Coon_BezierCoeff x, y;
+ void FromPoints(float x0,
+ float y0,
+ float x1,
+ float y1,
+ float x2,
+ float y2,
+ float x3,
+ float y3) {
+ x.FromPoints(x0, x1, x2, x3);
+ y.FromPoints(y0, y1, y2, y3);
+ }
+
+ Coon_Bezier first_half() {
+ Coon_Bezier result;
+ result.x = x.first_half();
+ result.y = y.first_half();
+ return result;
+ }
+
+ Coon_Bezier second_half() {
+ Coon_Bezier result;
+ result.x = x.second_half();
+ result.y = y.second_half();
+ return result;
+ }
+
+ void BezierInterpol(Coon_Bezier& C1,
+ Coon_Bezier& C2,
+ Coon_Bezier& D1,
+ Coon_Bezier& D2) {
+ x.BezierInterpol(C1.x, C2.x, D1.x, D2.x);
+ y.BezierInterpol(C1.y, C2.y, D1.y, D2.y);
+ }
+
+ void GetPoints(std::vector<FX_PATHPOINT>& pPoints, size_t start_idx) {
+ float p[4];
+ int i;
+ x.GetPoints(p);
+ for (i = 0; i < 4; i++)
+ pPoints[start_idx + i].m_Point.x = p[i];
+
+ y.GetPoints(p);
+ for (i = 0; i < 4; i++)
+ pPoints[start_idx + i].m_Point.y = p[i];
+ }
+
+ void GetPointsReverse(std::vector<FX_PATHPOINT>& pPoints, size_t start_idx) {
+ float p[4];
+ int i;
+ x.GetPointsReverse(p);
+ for (i = 0; i < 4; i++)
+ pPoints[i + start_idx].m_Point.x = p[i];
+
+ y.GetPointsReverse(p);
+ for (i = 0; i < 4; i++)
+ pPoints[i + start_idx].m_Point.y = p[i];
+ }
+
+ float Distance() { return x.Distance() + y.Distance(); }
+};
+
+int Interpolate(int p1, int p2, int delta1, int delta2, bool* overflow) {
+ pdfium::base::CheckedNumeric<int> p = p2;
+ p -= p1;
+ p *= delta1;
+ p /= delta2;
+ p += p1;
+ if (!p.IsValid())
+ *overflow = true;
+ return p.ValueOrDefault(0);
+}
+
+int BiInterpolImpl(int c0,
+ int c1,
+ int c2,
+ int c3,
+ int x,
+ int y,
+ int x_scale,
+ int y_scale,
+ bool* overflow) {
+ int x1 = Interpolate(c0, c3, x, x_scale, overflow);
+ int x2 = Interpolate(c1, c2, x, x_scale, overflow);
+ return Interpolate(x1, x2, y, y_scale, overflow);
+}
+
+struct Coon_Color {
+ Coon_Color() { memset(comp, 0, sizeof(int) * 3); }
+
+ // Returns true if successful, false if overflow detected.
+ bool BiInterpol(Coon_Color colors[4],
+ int x,
+ int y,
+ int x_scale,
+ int y_scale) {
+ bool overflow = false;
+ for (int i = 0; i < 3; i++) {
+ comp[i] = BiInterpolImpl(colors[0].comp[i], colors[1].comp[i],
+ colors[2].comp[i], colors[3].comp[i], x, y,
+ x_scale, y_scale, &overflow);
+ }
+ return !overflow;
+ }
+
+ int Distance(Coon_Color& o) {
+ return std::max({abs(comp[0] - o.comp[0]), abs(comp[1] - o.comp[1]),
+ abs(comp[2] - o.comp[2])});
+ }
+
+ int comp[3];
+};
+
+#define COONCOLOR_THRESHOLD 4
+struct CPDF_PatchDrawer {
+ void Draw(int x_scale,
+ int y_scale,
+ int left,
+ int bottom,
+ Coon_Bezier C1,
+ Coon_Bezier C2,
+ Coon_Bezier D1,
+ Coon_Bezier D2) {
+ bool bSmall = C1.Distance() < 2 && C2.Distance() < 2 && D1.Distance() < 2 &&
+ D2.Distance() < 2;
+ Coon_Color div_colors[4];
+ int d_bottom = 0;
+ int d_left = 0;
+ int d_top = 0;
+ int d_right = 0;
+ if (!div_colors[0].BiInterpol(patch_colors, left, bottom, x_scale,
+ y_scale)) {
+ return;
+ }
+ if (!bSmall) {
+ if (!div_colors[1].BiInterpol(patch_colors, left, bottom + 1, x_scale,
+ y_scale)) {
+ return;
+ }
+ if (!div_colors[2].BiInterpol(patch_colors, left + 1, bottom + 1, x_scale,
+ y_scale)) {
+ return;
+ }
+ if (!div_colors[3].BiInterpol(patch_colors, left + 1, bottom, x_scale,
+ y_scale)) {
+ return;
+ }
+ d_bottom = div_colors[3].Distance(div_colors[0]);
+ d_left = div_colors[1].Distance(div_colors[0]);
+ d_top = div_colors[1].Distance(div_colors[2]);
+ d_right = div_colors[2].Distance(div_colors[3]);
+ }
+
+ if (bSmall ||
+ (d_bottom < COONCOLOR_THRESHOLD && d_left < COONCOLOR_THRESHOLD &&
+ d_top < COONCOLOR_THRESHOLD && d_right < COONCOLOR_THRESHOLD)) {
+ std::vector<FX_PATHPOINT>& pPoints = path.GetPoints();
+ C1.GetPoints(pPoints, 0);
+ D2.GetPoints(pPoints, 3);
+ C2.GetPointsReverse(pPoints, 6);
+ D1.GetPointsReverse(pPoints, 9);
+ int fillFlags = FXFILL_WINDING | FXFILL_FULLCOVER;
+ if (bNoPathSmooth)
+ fillFlags |= FXFILL_NOPATHSMOOTH;
+ pDevice->DrawPath(
+ &path, nullptr, nullptr,
+ ArgbEncode(alpha, div_colors[0].comp[0], div_colors[0].comp[1],
+ div_colors[0].comp[2]),
+ 0, fillFlags);
+ } else {
+ if (d_bottom < COONCOLOR_THRESHOLD && d_top < COONCOLOR_THRESHOLD) {
+ Coon_Bezier m1;
+ m1.BezierInterpol(D1, D2, C1, C2);
+ y_scale *= 2;
+ bottom *= 2;
+ Draw(x_scale, y_scale, left, bottom, C1, m1, D1.first_half(),
+ D2.first_half());
+ Draw(x_scale, y_scale, left, bottom + 1, m1, C2, D1.second_half(),
+ D2.second_half());
+ } else if (d_left < COONCOLOR_THRESHOLD &&
+ d_right < COONCOLOR_THRESHOLD) {
+ Coon_Bezier m2;
+ m2.BezierInterpol(C1, C2, D1, D2);
+ x_scale *= 2;
+ left *= 2;
+ Draw(x_scale, y_scale, left, bottom, C1.first_half(), C2.first_half(),
+ D1, m2);
+ Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(),
+ C2.second_half(), m2, D2);
+ } else {
+ Coon_Bezier m1, m2;
+ m1.BezierInterpol(D1, D2, C1, C2);
+ m2.BezierInterpol(C1, C2, D1, D2);
+ Coon_Bezier m1f = m1.first_half();
+ Coon_Bezier m1s = m1.second_half();
+ Coon_Bezier m2f = m2.first_half();
+ Coon_Bezier m2s = m2.second_half();
+ x_scale *= 2;
+ y_scale *= 2;
+ left *= 2;
+ bottom *= 2;
+ Draw(x_scale, y_scale, left, bottom, C1.first_half(), m1f,
+ D1.first_half(), m2f);
+ Draw(x_scale, y_scale, left, bottom + 1, m1f, C2.first_half(),
+ D1.second_half(), m2s);
+ Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(), m1s, m2f,
+ D2.first_half());
+ Draw(x_scale, y_scale, left + 1, bottom + 1, m1s, C2.second_half(), m2s,
+ D2.second_half());
+ }
+ }
+ }
+
+ int max_delta;
+ CFX_PathData path;
+ CFX_RenderDevice* pDevice;
+ int bNoPathSmooth;
+ int alpha;
+ Coon_Color patch_colors[4];
+};
+
+void DrawCoonPatchMeshes(
+ ShadingType type,
+ const RetainPtr<CFX_DIBitmap>& pBitmap,
+ const CFX_Matrix& mtObject2Bitmap,
+ const CPDF_Stream* pShadingStream,
+ const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
+ const RetainPtr<CPDF_ColorSpace>& pCS,
+ bool bNoPathSmooth,
+ int alpha) {
+ ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
+ ASSERT(type == kCoonsPatchMeshShading ||
+ type == kTensorProductPatchMeshShading);
+
+ CFX_DefaultRenderDevice device;
+ device.Attach(pBitmap, false, nullptr, false);
+ CPDF_MeshStream stream(type, funcs, pShadingStream, pCS);
+ if (!stream.Load())
+ return;
+
+ CPDF_PatchDrawer patch;
+ patch.alpha = alpha;
+ patch.pDevice = &device;
+ patch.bNoPathSmooth = bNoPathSmooth;
+
+ for (int i = 0; i < 13; i++) {
+ patch.path.AppendPoint(
+ CFX_PointF(), i == 0 ? FXPT_TYPE::MoveTo : FXPT_TYPE::BezierTo, false);
+ }
+
+ CFX_PointF coords[16];
+ int point_count = type == kTensorProductPatchMeshShading ? 16 : 12;
+ while (!stream.BitStream()->IsEOF()) {
+ if (!stream.CanReadFlag())
+ break;
+ uint32_t flag = stream.ReadFlag();
+ int iStartPoint = 0, iStartColor = 0, i = 0;
+ if (flag) {
+ iStartPoint = 4;
+ iStartColor = 2;
+ CFX_PointF tempCoords[4];
+ for (i = 0; i < 4; i++) {
+ tempCoords[i] = coords[(flag * 3 + i) % 12];
+ }
+ memcpy(coords, tempCoords, sizeof(tempCoords));
+ Coon_Color tempColors[2];
+ tempColors[0] = patch.patch_colors[flag];
+ tempColors[1] = patch.patch_colors[(flag + 1) % 4];
+ memcpy(patch.patch_colors, tempColors, sizeof(Coon_Color) * 2);
+ }
+ for (i = iStartPoint; i < point_count; i++) {
+ if (!stream.CanReadCoords())
+ break;
+ coords[i] = mtObject2Bitmap.Transform(stream.ReadCoords());
+ }
+
+ for (i = iStartColor; i < 4; i++) {
+ if (!stream.CanReadColor())
+ break;
+
+ float r;
+ float g;
+ float b;
+ std::tie(r, g, b) = stream.ReadColor();
+
+ patch.patch_colors[i].comp[0] = (int32_t)(r * 255);
+ patch.patch_colors[i].comp[1] = (int32_t)(g * 255);
+ patch.patch_colors[i].comp[2] = (int32_t)(b * 255);
+ }
+ CFX_FloatRect bbox = CFX_FloatRect::GetBBox(coords, point_count);
+ if (bbox.right <= 0 || bbox.left >= (float)pBitmap->GetWidth() ||
+ bbox.top <= 0 || bbox.bottom >= (float)pBitmap->GetHeight()) {
+ continue;
+ }
+ Coon_Bezier C1, C2, D1, D2;
+ C1.FromPoints(coords[0].x, coords[0].y, coords[11].x, coords[11].y,
+ coords[10].x, coords[10].y, coords[9].x, coords[9].y);
+ C2.FromPoints(coords[3].x, coords[3].y, coords[4].x, coords[4].y,
+ coords[5].x, coords[5].y, coords[6].x, coords[6].y);
+ D1.FromPoints(coords[0].x, coords[0].y, coords[1].x, coords[1].y,
+ coords[2].x, coords[2].y, coords[3].x, coords[3].y);
+ D2.FromPoints(coords[9].x, coords[9].y, coords[8].x, coords[8].y,
+ coords[7].x, coords[7].y, coords[6].x, coords[6].y);
+ patch.Draw(1, 1, 0, 0, C1, C2, D1, D2);
+ }
+}
+
+} // namespace
+
+// static
+void CPDF_RenderShading::Draw(CFX_RenderDevice* pDevice,
+ CPDF_RenderContext* pContext,
+ const CPDF_PageObject* pCurObj,
+ const CPDF_ShadingPattern* pPattern,
+ const CFX_Matrix& mtMatrix,
+ const FX_RECT& clip_rect,
+ int alpha,
+ const CPDF_RenderOptions& options) {
+ const auto& funcs = pPattern->GetFuncs();
+ const CPDF_Dictionary* pDict = pPattern->GetShadingObject()->GetDict();
+ RetainPtr<CPDF_ColorSpace> pColorSpace = pPattern->GetCS();
+ if (!pColorSpace)
+ return;
+
+ FX_ARGB background = 0;
+ if (!pPattern->IsShadingObject() && pDict->KeyExist("Background")) {
+ const CPDF_Array* pBackColor = pDict->GetArrayFor("Background");
+ if (pBackColor && pBackColor->size() >= pColorSpace->CountComponents()) {
+ std::vector<float> comps =
+ ReadArrayElementsToVector(pBackColor, pColorSpace->CountComponents());
+
+ float R = 0.0f;
+ float G = 0.0f;
+ float B = 0.0f;
+ pColorSpace->GetRGB(comps.data(), &R, &G, &B);
+ background = ArgbEncode(255, (int32_t)(R * 255), (int32_t)(G * 255),
+ (int32_t)(B * 255));
+ }
+ }
+ FX_RECT clip_rect_bbox = clip_rect;
+ if (pDict->KeyExist("BBox")) {
+ clip_rect_bbox.Intersect(
+ mtMatrix.TransformRect(pDict->GetRectFor("BBox")).GetOuterRect());
+ }
+ bool bAlphaMode = options.ColorModeIs(CPDF_RenderOptions::kAlpha);
+ if (pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_SHADING &&
+ pDevice->GetDeviceDriver()->DrawShading(
+ pPattern, &mtMatrix, clip_rect_bbox, alpha, bAlphaMode)) {
+ return;
+ }
+ CPDF_DeviceBuffer buffer(pContext, pDevice, clip_rect_bbox, pCurObj, 150);
+ if (!buffer.Initialize())
+ return;
+
+ CFX_Matrix FinalMatrix = mtMatrix * buffer.GetMatrix();
+ RetainPtr<CFX_DIBitmap> pBitmap = buffer.GetBitmap();
+ if (!pBitmap->GetBuffer())
+ return;
+
+ pBitmap->Clear(background);
+ switch (pPattern->GetShadingType()) {
+ case kInvalidShading:
+ case kMaxShading:
+ return;
+ case kFunctionBasedShading:
+ DrawFuncShading(pBitmap, FinalMatrix, pDict, funcs, pColorSpace, alpha);
+ break;
+ case kAxialShading:
+ DrawAxialShading(pBitmap, FinalMatrix, pDict, funcs, pColorSpace, alpha);
+ break;
+ case kRadialShading:
+ DrawRadialShading(pBitmap, FinalMatrix, pDict, funcs, pColorSpace, alpha);
+ break;
+ case kFreeFormGouraudTriangleMeshShading: {
+ // The shading object can be a stream or a dictionary. We do not handle
+ // the case of dictionary at the moment.
+ if (const CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
+ DrawFreeGouraudShading(pBitmap, FinalMatrix, pStream, funcs,
+ pColorSpace, alpha);
+ }
+ } break;
+ case kLatticeFormGouraudTriangleMeshShading: {
+ // The shading object can be a stream or a dictionary. We do not handle
+ // the case of dictionary at the moment.
+ if (const CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
+ DrawLatticeGouraudShading(pBitmap, FinalMatrix, pStream, funcs,
+ pColorSpace, alpha);
+ }
+ } break;
+ case kCoonsPatchMeshShading:
+ case kTensorProductPatchMeshShading: {
+ // The shading object can be a stream or a dictionary. We do not handle
+ // the case of dictionary at the moment.
+ if (const CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
+ DrawCoonPatchMeshes(pPattern->GetShadingType(), pBitmap, FinalMatrix,
+ pStream, funcs, pColorSpace,
+ options.GetOptions().bNoPathSmooth, alpha);
+ }
+ } break;
+ }
+ if (bAlphaMode)
+ pBitmap->LoadChannelFromAlpha(FXDIB_Red, pBitmap);
+
+ if (options.ColorModeIs(CPDF_RenderOptions::kGray))
+ pBitmap->ConvertColorScale(0, 0xffffff);
+ buffer.OutputToDevice();
+}
diff --git a/core/fpdfapi/render/cpdf_rendershading.h b/core/fpdfapi/render/cpdf_rendershading.h
new file mode 100644
index 0000000..8c0d8a4
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_rendershading.h
@@ -0,0 +1,34 @@
+// Copyright 2019 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFAPI_RENDER_CPDF_RENDERSHADING_H_
+#define CORE_FPDFAPI_RENDER_CPDF_RENDERSHADING_H_
+
+class CFX_Matrix;
+class CFX_RenderDevice;
+class CPDF_PageObject;
+class CPDF_RenderContext;
+class CPDF_RenderOptions;
+class CPDF_ShadingPattern;
+struct FX_RECT;
+
+class CPDF_RenderShading {
+ public:
+ static void Draw(CFX_RenderDevice* pDevice,
+ CPDF_RenderContext* pContext,
+ const CPDF_PageObject* pCurObj,
+ const CPDF_ShadingPattern* pPattern,
+ const CFX_Matrix& mtMatrix,
+ const FX_RECT& clip_rect,
+ int alpha,
+ const CPDF_RenderOptions& options);
+
+ CPDF_RenderShading() = delete;
+ CPDF_RenderShading(const CPDF_RenderShading&) = delete;
+ CPDF_RenderShading& operator=(const CPDF_RenderShading&) = delete;
+};
+
+#endif // CORE_FPDFAPI_RENDER_CPDF_RENDERSHADING_H_
diff --git a/core/fpdfapi/render/cpdf_renderstatus.cpp b/core/fpdfapi/render/cpdf_renderstatus.cpp
index 89b815b..217ad71 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.cpp
+++ b/core/fpdfapi/render/cpdf_renderstatus.cpp
@@ -7,7 +7,6 @@
#include "core/fpdfapi/render/cpdf_renderstatus.h"
#include <algorithm>
-#include <array>
#include <cmath>
#include <limits>
#include <memory>
@@ -20,7 +19,6 @@
#include "core/fpdfapi/font/cpdf_font.h"
#include "core/fpdfapi/font/cpdf_type3char.h"
#include "core/fpdfapi/font/cpdf_type3font.h"
-#include "core/fpdfapi/page/cpdf_dibbase.h"
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_form.h"
#include "core/fpdfapi/page/cpdf_formobject.h"
@@ -28,7 +26,6 @@
#include "core/fpdfapi/page/cpdf_graphicstates.h"
#include "core/fpdfapi/page/cpdf_image.h"
#include "core/fpdfapi/page/cpdf_imageobject.h"
-#include "core/fpdfapi/page/cpdf_meshstream.h"
#include "core/fpdfapi/page/cpdf_occontext.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
@@ -43,22 +40,20 @@
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/fpdf_parser_utility.h"
#include "core/fpdfapi/render/cpdf_charposlist.h"
-#include "core/fpdfapi/render/cpdf_devicebuffer.h"
#include "core/fpdfapi/render/cpdf_docrenderdata.h"
#include "core/fpdfapi/render/cpdf_imagerenderer.h"
#include "core/fpdfapi/render/cpdf_pagerendercache.h"
#include "core/fpdfapi/render/cpdf_rendercontext.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fpdfapi/render/cpdf_rendershading.h"
#include "core/fpdfapi/render/cpdf_scaledrenderbuffer.h"
#include "core/fpdfapi/render/cpdf_textrenderer.h"
#include "core/fpdfapi/render/cpdf_type3cache.h"
#include "core/fxcrt/autorestorer.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/fx_system.h"
-#include "core/fxcrt/maybe_owned.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/cfx_glyphbitmap.h"
-#include "core/fxge/cfx_graphstatedata.h"
#include "core/fxge/cfx_pathdata.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/fx_font.h"
@@ -77,829 +72,9 @@
namespace {
-constexpr int kShadingSteps = 256;
constexpr int kRenderMaxRecursionDepth = 64;
int g_CurrentRecursionDepth = 0;
-uint32_t CountOutputsFromFunctions(
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs) {
- FX_SAFE_UINT32 total = 0;
- for (const auto& func : funcs) {
- if (func)
- total += func->CountOutputs();
- }
- return total.ValueOrDefault(0);
-}
-
-uint32_t GetValidatedOutputsCount(
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS) {
- uint32_t funcs_outputs = CountOutputsFromFunctions(funcs);
- return funcs_outputs ? std::max(funcs_outputs, pCS->CountComponents()) : 0;
-}
-
-std::array<FX_ARGB, kShadingSteps> GetShadingSteps(
- float t_min,
- float t_max,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- int alpha,
- size_t results_count) {
- ASSERT(results_count >= CountOutputsFromFunctions(funcs));
- ASSERT(results_count >= pCS->CountComponents());
- std::array<FX_ARGB, kShadingSteps> shading_steps;
- std::vector<float> result_array(results_count);
- float diff = t_max - t_min;
- for (int i = 0; i < kShadingSteps; ++i) {
- float input = diff * i / kShadingSteps + t_min;
- int offset = 0;
- for (const auto& func : funcs) {
- if (func) {
- int nresults = 0;
- if (func->Call(&input, 1, &result_array[offset], &nresults))
- offset += nresults;
- }
- }
- float R = 0.0f;
- float G = 0.0f;
- float B = 0.0f;
- pCS->GetRGB(result_array.data(), &R, &G, &B);
- shading_steps[i] =
- FXARGB_TODIB(ArgbEncode(alpha, FXSYS_roundf(R * 255),
- FXSYS_roundf(G * 255), FXSYS_roundf(B * 255)));
- }
- return shading_steps;
-}
-
-void DrawAxialShading(const RetainPtr<CFX_DIBitmap>& pBitmap,
- const CFX_Matrix& mtObject2Bitmap,
- const CPDF_Dictionary* pDict,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- int alpha) {
- ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
-
- const uint32_t total_results = GetValidatedOutputsCount(funcs, pCS);
- if (total_results == 0)
- return;
-
- const CPDF_Array* pCoords = pDict->GetArrayFor("Coords");
- if (!pCoords)
- return;
-
- float start_x = pCoords->GetNumberAt(0);
- float start_y = pCoords->GetNumberAt(1);
- float end_x = pCoords->GetNumberAt(2);
- float end_y = pCoords->GetNumberAt(3);
- float t_min = 0;
- float t_max = 1.0f;
- const CPDF_Array* pArray = pDict->GetArrayFor("Domain");
- if (pArray) {
- t_min = pArray->GetNumberAt(0);
- t_max = pArray->GetNumberAt(1);
- }
- pArray = pDict->GetArrayFor("Extend");
- const bool bStartExtend = pArray && pArray->GetBooleanAt(0, false);
- const bool bEndExtend = pArray && pArray->GetBooleanAt(1, false);
-
- int width = pBitmap->GetWidth();
- int height = pBitmap->GetHeight();
- float x_span = end_x - start_x;
- float y_span = end_y - start_y;
- float axis_len_square = (x_span * x_span) + (y_span * y_span);
-
- std::array<FX_ARGB, kShadingSteps> shading_steps =
- GetShadingSteps(t_min, t_max, funcs, pCS, alpha, total_results);
-
- int pitch = pBitmap->GetPitch();
- CFX_Matrix matrix = mtObject2Bitmap.GetInverse();
- for (int row = 0; row < height; row++) {
- uint32_t* dib_buf =
- reinterpret_cast<uint32_t*>(pBitmap->GetBuffer() + row * pitch);
- for (int column = 0; column < width; column++) {
- CFX_PointF pos = matrix.Transform(
- CFX_PointF(static_cast<float>(column), static_cast<float>(row)));
- float scale =
- (((pos.x - start_x) * x_span) + ((pos.y - start_y) * y_span)) /
- axis_len_square;
- int index = (int32_t)(scale * (kShadingSteps - 1));
- if (index < 0) {
- if (!bStartExtend)
- continue;
-
- index = 0;
- } else if (index >= kShadingSteps) {
- if (!bEndExtend)
- continue;
-
- index = kShadingSteps - 1;
- }
- dib_buf[column] = shading_steps[index];
- }
- }
-}
-
-void DrawRadialShading(const RetainPtr<CFX_DIBitmap>& pBitmap,
- const CFX_Matrix& mtObject2Bitmap,
- const CPDF_Dictionary* pDict,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- int alpha) {
- ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
-
- const uint32_t total_results = GetValidatedOutputsCount(funcs, pCS);
- if (total_results == 0)
- return;
-
- const CPDF_Array* pCoords = pDict->GetArrayFor("Coords");
- if (!pCoords)
- return;
-
- float start_x = pCoords->GetNumberAt(0);
- float start_y = pCoords->GetNumberAt(1);
- float start_r = pCoords->GetNumberAt(2);
- float end_x = pCoords->GetNumberAt(3);
- float end_y = pCoords->GetNumberAt(4);
- float end_r = pCoords->GetNumberAt(5);
- float t_min = 0;
- float t_max = 1.0f;
- const CPDF_Array* pArray = pDict->GetArrayFor("Domain");
- if (pArray) {
- t_min = pArray->GetNumberAt(0);
- t_max = pArray->GetNumberAt(1);
- }
- pArray = pDict->GetArrayFor("Extend");
- const bool bStartExtend = pArray && pArray->GetBooleanAt(0, false);
- const bool bEndExtend = pArray && pArray->GetBooleanAt(1, false);
-
- std::array<FX_ARGB, kShadingSteps> shading_steps =
- GetShadingSteps(t_min, t_max, funcs, pCS, alpha, total_results);
-
- const float dx = end_x - start_x;
- const float dy = end_y - start_y;
- const float dr = end_r - start_r;
- const float a = dx * dx + dy * dy - dr * dr;
- const bool a_is_float_zero = IsFloatZero(a);
-
- int width = pBitmap->GetWidth();
- int height = pBitmap->GetHeight();
- int pitch = pBitmap->GetPitch();
-
- bool bDecreasing =
- (dr < 0 && static_cast<int>(sqrt(dx * dx + dy * dy)) < -dr);
-
- CFX_Matrix matrix = mtObject2Bitmap.GetInverse();
- for (int row = 0; row < height; row++) {
- uint32_t* dib_buf =
- reinterpret_cast<uint32_t*>(pBitmap->GetBuffer() + row * pitch);
- for (int column = 0; column < width; column++) {
- CFX_PointF pos = matrix.Transform(
- CFX_PointF(static_cast<float>(column), static_cast<float>(row)));
- float pos_dx = pos.x - start_x;
- float pos_dy = pos.y - start_y;
- float b = -2 * (pos_dx * dx + pos_dy * dy + start_r * dr);
- float c = pos_dx * pos_dx + pos_dy * pos_dy - start_r * start_r;
- float s;
- if (IsFloatZero(b)) {
- s = sqrt(-c / a);
- } else if (a_is_float_zero) {
- s = -c / b;
- } else {
- float b2_4ac = (b * b) - 4 * (a * c);
- if (b2_4ac < 0)
- continue;
-
- float root = sqrt(b2_4ac);
- float s1 = (-b - root) / (2 * a);
- float s2 = (-b + root) / (2 * a);
- if (a <= 0)
- std::swap(s1, s2);
- if (bDecreasing)
- s = (s1 >= 0 || bStartExtend) ? s1 : s2;
- else
- s = (s2 <= 1.0f || bEndExtend) ? s2 : s1;
-
- if (start_r + s * dr < 0)
- continue;
- }
-
- int index = static_cast<int32_t>(s * (kShadingSteps - 1));
- if (index < 0) {
- if (!bStartExtend)
- continue;
- index = 0;
- } else if (index >= kShadingSteps) {
- if (!bEndExtend)
- continue;
- index = kShadingSteps - 1;
- }
- dib_buf[column] = shading_steps[index];
- }
- }
-}
-
-void DrawFuncShading(const RetainPtr<CFX_DIBitmap>& pBitmap,
- const CFX_Matrix& mtObject2Bitmap,
- const CPDF_Dictionary* pDict,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- int alpha) {
- ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
-
- const uint32_t total_results = GetValidatedOutputsCount(funcs, pCS);
- if (total_results == 0)
- return;
-
- const CPDF_Array* pDomain = pDict->GetArrayFor("Domain");
- float xmin = 0.0f;
- float ymin = 0.0f;
- float xmax = 1.0f;
- float ymax = 1.0f;
- if (pDomain) {
- xmin = pDomain->GetNumberAt(0);
- xmax = pDomain->GetNumberAt(1);
- ymin = pDomain->GetNumberAt(2);
- ymax = pDomain->GetNumberAt(3);
- }
- CFX_Matrix mtDomain2Target = pDict->GetMatrixFor("Matrix");
- CFX_Matrix matrix =
- mtObject2Bitmap.GetInverse() * mtDomain2Target.GetInverse();
- int width = pBitmap->GetWidth();
- int height = pBitmap->GetHeight();
- int pitch = pBitmap->GetPitch();
-
- ASSERT(total_results >= CountOutputsFromFunctions(funcs));
- ASSERT(total_results >= pCS->CountComponents());
- std::vector<float> result_array(total_results);
- for (int row = 0; row < height; ++row) {
- uint32_t* dib_buf = (uint32_t*)(pBitmap->GetBuffer() + row * pitch);
- for (int column = 0; column < width; column++) {
- CFX_PointF pos = matrix.Transform(
- CFX_PointF(static_cast<float>(column), static_cast<float>(row)));
- if (pos.x < xmin || pos.x > xmax || pos.y < ymin || pos.y > ymax)
- continue;
-
- float input[] = {pos.x, pos.y};
- int offset = 0;
- for (const auto& func : funcs) {
- if (func) {
- int nresults;
- if (func->Call(input, 2, &result_array[offset], &nresults))
- offset += nresults;
- }
- }
-
- float R = 0.0f;
- float G = 0.0f;
- float B = 0.0f;
- pCS->GetRGB(result_array.data(), &R, &G, &B);
- dib_buf[column] = FXARGB_TODIB(ArgbEncode(
- alpha, (int32_t)(R * 255), (int32_t)(G * 255), (int32_t)(B * 255)));
- }
- }
-}
-
-bool GetScanlineIntersect(int y,
- const CFX_PointF& first,
- const CFX_PointF& second,
- float* x) {
- if (first.y == second.y)
- return false;
-
- if (first.y < second.y) {
- if (y < first.y || y > second.y)
- return false;
- } else if (y < second.y || y > first.y) {
- return false;
- }
- *x = first.x + ((second.x - first.x) * (y - first.y) / (second.y - first.y));
- return true;
-}
-
-void DrawGouraud(const RetainPtr<CFX_DIBitmap>& pBitmap,
- int alpha,
- CPDF_MeshVertex triangle[3]) {
- float min_y = triangle[0].position.y;
- float max_y = triangle[0].position.y;
- for (int i = 1; i < 3; i++) {
- min_y = std::min(min_y, triangle[i].position.y);
- max_y = std::max(max_y, triangle[i].position.y);
- }
- if (min_y == max_y)
- return;
-
- int min_yi = std::max(static_cast<int>(floor(min_y)), 0);
- int max_yi = static_cast<int>(ceil(max_y));
-
- if (max_yi >= pBitmap->GetHeight())
- max_yi = pBitmap->GetHeight() - 1;
-
- for (int y = min_yi; y <= max_yi; y++) {
- int nIntersects = 0;
- float inter_x[3];
- float r[3];
- float g[3];
- float b[3];
- for (int i = 0; i < 3; i++) {
- CPDF_MeshVertex& vertex1 = triangle[i];
- CPDF_MeshVertex& vertex2 = triangle[(i + 1) % 3];
- CFX_PointF& position1 = vertex1.position;
- CFX_PointF& position2 = vertex2.position;
- bool bIntersect =
- GetScanlineIntersect(y, position1, position2, &inter_x[nIntersects]);
- if (!bIntersect)
- continue;
-
- float y_dist = (y - position1.y) / (position2.y - position1.y);
- r[nIntersects] = vertex1.r + ((vertex2.r - vertex1.r) * y_dist);
- g[nIntersects] = vertex1.g + ((vertex2.g - vertex1.g) * y_dist);
- b[nIntersects] = vertex1.b + ((vertex2.b - vertex1.b) * y_dist);
- nIntersects++;
- }
- if (nIntersects != 2)
- continue;
-
- int min_x, max_x, start_index, end_index;
- if (inter_x[0] < inter_x[1]) {
- min_x = (int)floor(inter_x[0]);
- max_x = (int)ceil(inter_x[1]);
- start_index = 0;
- end_index = 1;
- } else {
- min_x = (int)floor(inter_x[1]);
- max_x = (int)ceil(inter_x[0]);
- start_index = 1;
- end_index = 0;
- }
-
- int start_x = std::max(min_x, 0);
- int end_x = max_x;
- if (end_x > pBitmap->GetWidth())
- end_x = pBitmap->GetWidth();
-
- uint8_t* dib_buf =
- pBitmap->GetBuffer() + y * pBitmap->GetPitch() + start_x * 4;
- float r_unit = (r[end_index] - r[start_index]) / (max_x - min_x);
- float g_unit = (g[end_index] - g[start_index]) / (max_x - min_x);
- float b_unit = (b[end_index] - b[start_index]) / (max_x - min_x);
- float R = r[start_index] + (start_x - min_x) * r_unit;
- float G = g[start_index] + (start_x - min_x) * g_unit;
- float B = b[start_index] + (start_x - min_x) * b_unit;
- for (int x = start_x; x < end_x; x++) {
- R += r_unit;
- G += g_unit;
- B += b_unit;
- FXARGB_SETDIB(dib_buf,
- ArgbEncode(alpha, (int32_t)(R * 255), (int32_t)(G * 255),
- (int32_t)(B * 255)));
- dib_buf += 4;
- }
- }
-}
-
-void DrawFreeGouraudShading(
- const RetainPtr<CFX_DIBitmap>& pBitmap,
- const CFX_Matrix& mtObject2Bitmap,
- const CPDF_Stream* pShadingStream,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- int alpha) {
- ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
-
- CPDF_MeshStream stream(kFreeFormGouraudTriangleMeshShading, funcs,
- pShadingStream, pCS);
- if (!stream.Load())
- return;
-
- CPDF_MeshVertex triangle[3];
- memset(triangle, 0, sizeof(triangle));
-
- while (!stream.BitStream()->IsEOF()) {
- CPDF_MeshVertex vertex;
- uint32_t flag;
- if (!stream.ReadVertex(mtObject2Bitmap, &vertex, &flag))
- return;
-
- if (flag == 0) {
- triangle[0] = vertex;
- for (int j = 1; j < 3; j++) {
- uint32_t tflag;
- if (!stream.ReadVertex(mtObject2Bitmap, &triangle[j], &tflag))
- return;
- }
- } else {
- if (flag == 1)
- triangle[0] = triangle[1];
-
- triangle[1] = triangle[2];
- triangle[2] = vertex;
- }
- DrawGouraud(pBitmap, alpha, triangle);
- }
-}
-
-void DrawLatticeGouraudShading(
- const RetainPtr<CFX_DIBitmap>& pBitmap,
- const CFX_Matrix& mtObject2Bitmap,
- const CPDF_Stream* pShadingStream,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- int alpha) {
- ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
-
- int row_verts = pShadingStream->GetDict()->GetIntegerFor("VerticesPerRow");
- if (row_verts < 2)
- return;
-
- CPDF_MeshStream stream(kLatticeFormGouraudTriangleMeshShading, funcs,
- pShadingStream, pCS);
- if (!stream.Load())
- return;
-
- std::vector<CPDF_MeshVertex> vertices[2];
- vertices[0] = stream.ReadVertexRow(mtObject2Bitmap, row_verts);
- if (vertices[0].empty())
- return;
-
- int last_index = 0;
- while (1) {
- vertices[1 - last_index] = stream.ReadVertexRow(mtObject2Bitmap, row_verts);
- if (vertices[1 - last_index].empty())
- return;
-
- CPDF_MeshVertex triangle[3];
- for (int i = 1; i < row_verts; ++i) {
- triangle[0] = vertices[last_index][i];
- triangle[1] = vertices[1 - last_index][i - 1];
- triangle[2] = vertices[last_index][i - 1];
- DrawGouraud(pBitmap, alpha, triangle);
- triangle[2] = vertices[1 - last_index][i];
- DrawGouraud(pBitmap, alpha, triangle);
- }
- last_index = 1 - last_index;
- }
-}
-
-struct Coon_BezierCoeff {
- float a, b, c, d;
- void FromPoints(float p0, float p1, float p2, float p3) {
- a = -p0 + 3 * p1 - 3 * p2 + p3;
- b = 3 * p0 - 6 * p1 + 3 * p2;
- c = -3 * p0 + 3 * p1;
- d = p0;
- }
- Coon_BezierCoeff first_half() {
- Coon_BezierCoeff result;
- result.a = a / 8;
- result.b = b / 4;
- result.c = c / 2;
- result.d = d;
- return result;
- }
- Coon_BezierCoeff second_half() {
- Coon_BezierCoeff result;
- result.a = a / 8;
- result.b = 3 * a / 8 + b / 4;
- result.c = 3 * a / 8 + b / 2 + c / 2;
- result.d = a / 8 + b / 4 + c / 2 + d;
- return result;
- }
- void GetPoints(float p[4]) {
- p[0] = d;
- p[1] = c / 3 + p[0];
- p[2] = b / 3 - p[0] + 2 * p[1];
- p[3] = a + p[0] - 3 * p[1] + 3 * p[2];
- }
- void GetPointsReverse(float p[4]) {
- p[3] = d;
- p[2] = c / 3 + p[3];
- p[1] = b / 3 - p[3] + 2 * p[2];
- p[0] = a + p[3] - 3 * p[2] + 3 * p[1];
- }
- void BezierInterpol(Coon_BezierCoeff& C1,
- Coon_BezierCoeff& C2,
- Coon_BezierCoeff& D1,
- Coon_BezierCoeff& D2) {
- a = (D1.a + D2.a) / 2;
- b = (D1.b + D2.b) / 2;
- c = (D1.c + D2.c) / 2 - (C1.a / 8 + C1.b / 4 + C1.c / 2) +
- (C2.a / 8 + C2.b / 4) + (-C1.d + D2.d) / 2 - (C2.a + C2.b) / 2;
- d = C1.a / 8 + C1.b / 4 + C1.c / 2 + C1.d;
- }
- float Distance() {
- float dis = a + b + c;
- return dis < 0 ? -dis : dis;
- }
-};
-
-struct Coon_Bezier {
- Coon_BezierCoeff x, y;
- void FromPoints(float x0,
- float y0,
- float x1,
- float y1,
- float x2,
- float y2,
- float x3,
- float y3) {
- x.FromPoints(x0, x1, x2, x3);
- y.FromPoints(y0, y1, y2, y3);
- }
-
- Coon_Bezier first_half() {
- Coon_Bezier result;
- result.x = x.first_half();
- result.y = y.first_half();
- return result;
- }
-
- Coon_Bezier second_half() {
- Coon_Bezier result;
- result.x = x.second_half();
- result.y = y.second_half();
- return result;
- }
-
- void BezierInterpol(Coon_Bezier& C1,
- Coon_Bezier& C2,
- Coon_Bezier& D1,
- Coon_Bezier& D2) {
- x.BezierInterpol(C1.x, C2.x, D1.x, D2.x);
- y.BezierInterpol(C1.y, C2.y, D1.y, D2.y);
- }
-
- void GetPoints(std::vector<FX_PATHPOINT>& pPoints, size_t start_idx) {
- float p[4];
- int i;
- x.GetPoints(p);
- for (i = 0; i < 4; i++)
- pPoints[start_idx + i].m_Point.x = p[i];
-
- y.GetPoints(p);
- for (i = 0; i < 4; i++)
- pPoints[start_idx + i].m_Point.y = p[i];
- }
-
- void GetPointsReverse(std::vector<FX_PATHPOINT>& pPoints, size_t start_idx) {
- float p[4];
- int i;
- x.GetPointsReverse(p);
- for (i = 0; i < 4; i++)
- pPoints[i + start_idx].m_Point.x = p[i];
-
- y.GetPointsReverse(p);
- for (i = 0; i < 4; i++)
- pPoints[i + start_idx].m_Point.y = p[i];
- }
-
- float Distance() { return x.Distance() + y.Distance(); }
-};
-
-int Interpolate(int p1, int p2, int delta1, int delta2, bool* overflow) {
- pdfium::base::CheckedNumeric<int> p = p2;
- p -= p1;
- p *= delta1;
- p /= delta2;
- p += p1;
- if (!p.IsValid())
- *overflow = true;
- return p.ValueOrDefault(0);
-}
-
-int BiInterpolImpl(int c0,
- int c1,
- int c2,
- int c3,
- int x,
- int y,
- int x_scale,
- int y_scale,
- bool* overflow) {
- int x1 = Interpolate(c0, c3, x, x_scale, overflow);
- int x2 = Interpolate(c1, c2, x, x_scale, overflow);
- return Interpolate(x1, x2, y, y_scale, overflow);
-}
-
-struct Coon_Color {
- Coon_Color() { memset(comp, 0, sizeof(int) * 3); }
-
- // Returns true if successful, false if overflow detected.
- bool BiInterpol(Coon_Color colors[4],
- int x,
- int y,
- int x_scale,
- int y_scale) {
- bool overflow = false;
- for (int i = 0; i < 3; i++) {
- comp[i] = BiInterpolImpl(colors[0].comp[i], colors[1].comp[i],
- colors[2].comp[i], colors[3].comp[i], x, y,
- x_scale, y_scale, &overflow);
- }
- return !overflow;
- }
-
- int Distance(Coon_Color& o) {
- return std::max({abs(comp[0] - o.comp[0]), abs(comp[1] - o.comp[1]),
- abs(comp[2] - o.comp[2])});
- }
-
- int comp[3];
-};
-
-#define COONCOLOR_THRESHOLD 4
-struct CPDF_PatchDrawer {
- void Draw(int x_scale,
- int y_scale,
- int left,
- int bottom,
- Coon_Bezier C1,
- Coon_Bezier C2,
- Coon_Bezier D1,
- Coon_Bezier D2) {
- bool bSmall = C1.Distance() < 2 && C2.Distance() < 2 && D1.Distance() < 2 &&
- D2.Distance() < 2;
- Coon_Color div_colors[4];
- int d_bottom = 0;
- int d_left = 0;
- int d_top = 0;
- int d_right = 0;
- if (!div_colors[0].BiInterpol(patch_colors, left, bottom, x_scale,
- y_scale)) {
- return;
- }
- if (!bSmall) {
- if (!div_colors[1].BiInterpol(patch_colors, left, bottom + 1, x_scale,
- y_scale)) {
- return;
- }
- if (!div_colors[2].BiInterpol(patch_colors, left + 1, bottom + 1, x_scale,
- y_scale)) {
- return;
- }
- if (!div_colors[3].BiInterpol(patch_colors, left + 1, bottom, x_scale,
- y_scale)) {
- return;
- }
- d_bottom = div_colors[3].Distance(div_colors[0]);
- d_left = div_colors[1].Distance(div_colors[0]);
- d_top = div_colors[1].Distance(div_colors[2]);
- d_right = div_colors[2].Distance(div_colors[3]);
- }
-
- if (bSmall ||
- (d_bottom < COONCOLOR_THRESHOLD && d_left < COONCOLOR_THRESHOLD &&
- d_top < COONCOLOR_THRESHOLD && d_right < COONCOLOR_THRESHOLD)) {
- std::vector<FX_PATHPOINT>& pPoints = path.GetPoints();
- C1.GetPoints(pPoints, 0);
- D2.GetPoints(pPoints, 3);
- C2.GetPointsReverse(pPoints, 6);
- D1.GetPointsReverse(pPoints, 9);
- int fillFlags = FXFILL_WINDING | FXFILL_FULLCOVER;
- if (bNoPathSmooth)
- fillFlags |= FXFILL_NOPATHSMOOTH;
- pDevice->DrawPath(
- &path, nullptr, nullptr,
- ArgbEncode(alpha, div_colors[0].comp[0], div_colors[0].comp[1],
- div_colors[0].comp[2]),
- 0, fillFlags);
- } else {
- if (d_bottom < COONCOLOR_THRESHOLD && d_top < COONCOLOR_THRESHOLD) {
- Coon_Bezier m1;
- m1.BezierInterpol(D1, D2, C1, C2);
- y_scale *= 2;
- bottom *= 2;
- Draw(x_scale, y_scale, left, bottom, C1, m1, D1.first_half(),
- D2.first_half());
- Draw(x_scale, y_scale, left, bottom + 1, m1, C2, D1.second_half(),
- D2.second_half());
- } else if (d_left < COONCOLOR_THRESHOLD &&
- d_right < COONCOLOR_THRESHOLD) {
- Coon_Bezier m2;
- m2.BezierInterpol(C1, C2, D1, D2);
- x_scale *= 2;
- left *= 2;
- Draw(x_scale, y_scale, left, bottom, C1.first_half(), C2.first_half(),
- D1, m2);
- Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(),
- C2.second_half(), m2, D2);
- } else {
- Coon_Bezier m1, m2;
- m1.BezierInterpol(D1, D2, C1, C2);
- m2.BezierInterpol(C1, C2, D1, D2);
- Coon_Bezier m1f = m1.first_half();
- Coon_Bezier m1s = m1.second_half();
- Coon_Bezier m2f = m2.first_half();
- Coon_Bezier m2s = m2.second_half();
- x_scale *= 2;
- y_scale *= 2;
- left *= 2;
- bottom *= 2;
- Draw(x_scale, y_scale, left, bottom, C1.first_half(), m1f,
- D1.first_half(), m2f);
- Draw(x_scale, y_scale, left, bottom + 1, m1f, C2.first_half(),
- D1.second_half(), m2s);
- Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(), m1s, m2f,
- D2.first_half());
- Draw(x_scale, y_scale, left + 1, bottom + 1, m1s, C2.second_half(), m2s,
- D2.second_half());
- }
- }
- }
-
- int max_delta;
- CFX_PathData path;
- CFX_RenderDevice* pDevice;
- int bNoPathSmooth;
- int alpha;
- Coon_Color patch_colors[4];
-};
-
-void DrawCoonPatchMeshes(
- ShadingType type,
- const RetainPtr<CFX_DIBitmap>& pBitmap,
- const CFX_Matrix& mtObject2Bitmap,
- const CPDF_Stream* pShadingStream,
- const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
- const RetainPtr<CPDF_ColorSpace>& pCS,
- bool bNoPathSmooth,
- int alpha) {
- ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
- ASSERT(type == kCoonsPatchMeshShading ||
- type == kTensorProductPatchMeshShading);
-
- CFX_DefaultRenderDevice device;
- device.Attach(pBitmap, false, nullptr, false);
- CPDF_MeshStream stream(type, funcs, pShadingStream, pCS);
- if (!stream.Load())
- return;
-
- CPDF_PatchDrawer patch;
- patch.alpha = alpha;
- patch.pDevice = &device;
- patch.bNoPathSmooth = bNoPathSmooth;
-
- for (int i = 0; i < 13; i++) {
- patch.path.AppendPoint(
- CFX_PointF(), i == 0 ? FXPT_TYPE::MoveTo : FXPT_TYPE::BezierTo, false);
- }
-
- CFX_PointF coords[16];
- int point_count = type == kTensorProductPatchMeshShading ? 16 : 12;
- while (!stream.BitStream()->IsEOF()) {
- if (!stream.CanReadFlag())
- break;
- uint32_t flag = stream.ReadFlag();
- int iStartPoint = 0, iStartColor = 0, i = 0;
- if (flag) {
- iStartPoint = 4;
- iStartColor = 2;
- CFX_PointF tempCoords[4];
- for (i = 0; i < 4; i++) {
- tempCoords[i] = coords[(flag * 3 + i) % 12];
- }
- memcpy(coords, tempCoords, sizeof(tempCoords));
- Coon_Color tempColors[2];
- tempColors[0] = patch.patch_colors[flag];
- tempColors[1] = patch.patch_colors[(flag + 1) % 4];
- memcpy(patch.patch_colors, tempColors, sizeof(Coon_Color) * 2);
- }
- for (i = iStartPoint; i < point_count; i++) {
- if (!stream.CanReadCoords())
- break;
- coords[i] = mtObject2Bitmap.Transform(stream.ReadCoords());
- }
-
- for (i = iStartColor; i < 4; i++) {
- if (!stream.CanReadColor())
- break;
-
- float r;
- float g;
- float b;
- std::tie(r, g, b) = stream.ReadColor();
-
- patch.patch_colors[i].comp[0] = (int32_t)(r * 255);
- patch.patch_colors[i].comp[1] = (int32_t)(g * 255);
- patch.patch_colors[i].comp[2] = (int32_t)(b * 255);
- }
- CFX_FloatRect bbox = CFX_FloatRect::GetBBox(coords, point_count);
- if (bbox.right <= 0 || bbox.left >= (float)pBitmap->GetWidth() ||
- bbox.top <= 0 || bbox.bottom >= (float)pBitmap->GetHeight()) {
- continue;
- }
- Coon_Bezier C1, C2, D1, D2;
- C1.FromPoints(coords[0].x, coords[0].y, coords[11].x, coords[11].y,
- coords[10].x, coords[10].y, coords[9].x, coords[9].y);
- C2.FromPoints(coords[3].x, coords[3].y, coords[4].x, coords[4].y,
- coords[5].x, coords[5].y, coords[6].x, coords[6].y);
- D1.FromPoints(coords[0].x, coords[0].y, coords[1].x, coords[1].y,
- coords[2].x, coords[2].y, coords[3].x, coords[3].y);
- D2.FromPoints(coords[9].x, coords[9].y, coords[8].x, coords[8].y,
- coords[7].x, coords[7].y, coords[6].x, coords[6].y);
- patch.Draw(1, 1, 0, 0, C1, C2, D1, D2);
- }
-}
-
RetainPtr<CFX_DIBitmap> DrawPatternBitmap(
CPDF_Document* pDoc,
CPDF_PageRenderCache* pCache,
@@ -1995,101 +1170,6 @@
}
}
-void CPDF_RenderStatus::DrawShading(const CPDF_ShadingPattern* pPattern,
- const CFX_Matrix& mtMatrix,
- const FX_RECT& clip_rect,
- int alpha,
- bool bAlphaMode) {
- const auto& funcs = pPattern->GetFuncs();
- const CPDF_Dictionary* pDict = pPattern->GetShadingObject()->GetDict();
- RetainPtr<CPDF_ColorSpace> pColorSpace = pPattern->GetCS();
- if (!pColorSpace)
- return;
-
- FX_ARGB background = 0;
- if (!pPattern->IsShadingObject() && pDict->KeyExist("Background")) {
- const CPDF_Array* pBackColor = pDict->GetArrayFor("Background");
- if (pBackColor && pBackColor->size() >= pColorSpace->CountComponents()) {
- std::vector<float> comps =
- ReadArrayElementsToVector(pBackColor, pColorSpace->CountComponents());
-
- float R = 0.0f;
- float G = 0.0f;
- float B = 0.0f;
- pColorSpace->GetRGB(comps.data(), &R, &G, &B);
- background = ArgbEncode(255, (int32_t)(R * 255), (int32_t)(G * 255),
- (int32_t)(B * 255));
- }
- }
- FX_RECT clip_rect_bbox = clip_rect;
- if (pDict->KeyExist("BBox")) {
- clip_rect_bbox.Intersect(
- mtMatrix.TransformRect(pDict->GetRectFor("BBox")).GetOuterRect());
- }
- if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_SHADING &&
- m_pDevice->GetDeviceDriver()->DrawShading(
- pPattern, &mtMatrix, clip_rect_bbox, alpha, bAlphaMode)) {
- return;
- }
- CPDF_DeviceBuffer buffer(m_pContext.Get(), m_pDevice, clip_rect_bbox,
- m_pCurObj.Get(), 150);
- if (!buffer.Initialize())
- return;
-
- CFX_Matrix FinalMatrix = mtMatrix * buffer.GetMatrix();
- RetainPtr<CFX_DIBitmap> pBitmap = buffer.GetBitmap();
- if (!pBitmap->GetBuffer())
- return;
-
- pBitmap->Clear(background);
- switch (pPattern->GetShadingType()) {
- case kInvalidShading:
- case kMaxShading:
- return;
- case kFunctionBasedShading:
- DrawFuncShading(pBitmap, FinalMatrix, pDict, funcs, pColorSpace, alpha);
- break;
- case kAxialShading:
- DrawAxialShading(pBitmap, FinalMatrix, pDict, funcs, pColorSpace, alpha);
- break;
- case kRadialShading:
- DrawRadialShading(pBitmap, FinalMatrix, pDict, funcs, pColorSpace, alpha);
- break;
- case kFreeFormGouraudTriangleMeshShading: {
- // The shading object can be a stream or a dictionary. We do not handle
- // the case of dictionary at the moment.
- if (const CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
- DrawFreeGouraudShading(pBitmap, FinalMatrix, pStream, funcs,
- pColorSpace, alpha);
- }
- } break;
- case kLatticeFormGouraudTriangleMeshShading: {
- // The shading object can be a stream or a dictionary. We do not handle
- // the case of dictionary at the moment.
- if (const CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
- DrawLatticeGouraudShading(pBitmap, FinalMatrix, pStream, funcs,
- pColorSpace, alpha);
- }
- } break;
- case kCoonsPatchMeshShading:
- case kTensorProductPatchMeshShading: {
- // The shading object can be a stream or a dictionary. We do not handle
- // the case of dictionary at the moment.
- if (const CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
- DrawCoonPatchMeshes(pPattern->GetShadingType(), pBitmap, FinalMatrix,
- pStream, funcs, pColorSpace,
- m_Options.GetOptions().bNoPathSmooth, alpha);
- }
- } break;
- }
- if (bAlphaMode)
- pBitmap->LoadChannelFromAlpha(FXDIB_Red, pBitmap);
-
- if (m_Options.ColorModeIs(CPDF_RenderOptions::kGray))
- pBitmap->ConvertColorScale(0, 0xffffff);
- buffer.OutputToDevice();
-}
-
void CPDF_RenderStatus::DrawShadingPattern(CPDF_ShadingPattern* pattern,
const CPDF_PageObject* pPageObj,
const CFX_Matrix& mtObj2Device,
@@ -2109,8 +1189,8 @@
int alpha =
FXSYS_roundf(255 * (bStroke ? pPageObj->m_GeneralState.GetStrokeAlpha()
: pPageObj->m_GeneralState.GetFillAlpha()));
- DrawShading(pattern, matrix, rect, alpha,
- m_Options.ColorModeIs(CPDF_RenderOptions::kAlpha));
+ CPDF_RenderShading::Draw(m_pDevice, m_pContext.Get(), m_pCurObj.Get(),
+ pattern, matrix, rect, alpha, m_Options);
}
void CPDF_RenderStatus::ProcessShading(const CPDF_ShadingObject* pShadingObj,
@@ -2122,9 +1202,11 @@
return;
CFX_Matrix matrix = pShadingObj->matrix() * mtObj2Device;
- DrawShading(pShadingObj->pattern(), matrix, rect,
- FXSYS_roundf(255 * pShadingObj->m_GeneralState.GetFillAlpha()),
- m_Options.ColorModeIs(CPDF_RenderOptions::kAlpha));
+ CPDF_RenderShading::Draw(
+ m_pDevice, m_pContext.Get(), m_pCurObj.Get(), pShadingObj->pattern(),
+ matrix, rect,
+ FXSYS_roundf(255 * pShadingObj->m_GeneralState.GetFillAlpha()),
+ m_Options);
}
void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
diff --git a/core/fpdfapi/render/cpdf_renderstatus.h b/core/fpdfapi/render/cpdf_renderstatus.h
index 193a7d3..76eb71c 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.h
+++ b/core/fpdfapi/render/cpdf_renderstatus.h
@@ -152,11 +152,6 @@
const CFX_Matrix& mtObj2Device);
void ProcessShading(const CPDF_ShadingObject* pShadingObj,
const CFX_Matrix& mtObj2Device);
- void DrawShading(const CPDF_ShadingPattern* pPattern,
- const CFX_Matrix& mtMatrix,
- const FX_RECT& clip_rect,
- int alpha,
- bool bAlphaMode);
bool ProcessType3Text(CPDF_TextObject* textobj,
const CFX_Matrix& mtObj2Device);
bool ProcessText(CPDF_TextObject* textobj,
