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pdfium / pdfium / refs/heads/main / . / core / fxge / skia / fx_skia_device.cpp
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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxge/skia/fx_skia_device.h"
#include <math.h>
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <limits>
#include <memory>
#include <utility>
#include <vector>
#include "build/build_config.h"
#include "core/fpdfapi/page/cpdf_expintfunc.h"
#include "core/fpdfapi/page/cpdf_function.h"
#include "core/fpdfapi/page/cpdf_meshstream.h"
#include "core/fpdfapi/page/cpdf_sampledfunc.h"
#include "core/fpdfapi/page/cpdf_shadingpattern.h"
#include "core/fpdfapi/page/cpdf_stitchfunc.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/cpdf_stream_acc.h"
#include "core/fxcrt/cfx_bitstream.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/check_op.h"
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/fx_2d_size.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/notreached.h"
#include "core/fxcrt/numerics/safe_conversions.h"
#include "core/fxcrt/ptr_util.h"
#include "core/fxcrt/span.h"
#include "core/fxcrt/stl_util.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/cfx_fillrenderoptions.h"
#include "core/fxge/cfx_font.h"
#include "core/fxge/cfx_graphstatedata.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/cfx_renderdevice.h"
#include "core/fxge/cfx_substfont.h"
#include "core/fxge/cfx_textrenderoptions.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/cfx_imagerenderer.h"
#include "core/fxge/dib/cstretchengine.h"
#include "core/fxge/dib/fx_dib.h"
#include "core/fxge/text_char_pos.h"
#include "third_party/skia/include/core/SkBlendMode.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkClipOp.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "third_party/skia/include/core/SkColorType.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkImageInfo.h"
#include "third_party/skia/include/core/SkMaskFilter.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkPathEffect.h"
#include "third_party/skia/include/core/SkPathUtils.h"
#include "third_party/skia/include/core/SkPixmap.h"
#include "third_party/skia/include/core/SkRSXform.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/core/SkSamplingOptions.h"
#include "third_party/skia/include/core/SkShader.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkSurface.h"
#include "third_party/skia/include/core/SkTextBlob.h"
#include "third_party/skia/include/core/SkTileMode.h"
#include "third_party/skia/include/core/SkTypeface.h"
#include "third_party/skia/include/effects/SkDashPathEffect.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "third_party/skia/include/pathops/SkPathOps.h"
namespace {
#define SHOW_SKIA_PATH 0 // set to 1 to print the path contents
#if SHOW_SKIA_PATH
#define SHOW_SKIA_PATH_SHORTHAND 0 // set to 1 for abbreviated path contents
#endif
#if SHOW_SKIA_PATH
void DebugShowSkiaPaint(const SkPaint& paint) {
if (SkPaint::kFill_Style == paint.getStyle()) {
printf("fill 0x%08x\n", paint.getColor());
} else {
printf("stroke 0x%08x width %g\n", paint.getColor(),
paint.getStrokeWidth());
}
}
#endif // SHOW_SKIA_PATH
void DebugShowSkiaPath(const SkPath& path) {
#if SHOW_SKIA_PATH
#if SHOW_SKIA_PATH_SHORTHAND
printf(" **\n");
#else
SkDynamicMemoryWStream stream;
path.dump(&stream, false);
DataVector<char> storage(stream.bytesWritten());
stream.copyTo(storage.data());
printf("%.*s", static_cast<int>(storage.size()), storage.data());
#endif // SHOW_SKIA_PATH_SHORTHAND
#endif // SHOW_SKIA_PATH
}
void DebugShowCanvasClip(CFX_SkiaDeviceDriver* driver, const SkCanvas* canvas) {
#if SHOW_SKIA_PATH
SkMatrix matrix = canvas->getTotalMatrix();
SkScalar m[9];
matrix.get9(m);
printf("matrix (%g,%g,%g) (%g,%g,%g) (%g,%g,%g)\n", m[0], m[1], m[2], m[3],
m[4], m[5], m[6], m[7], m[8]);
SkRect local = canvas->getLocalClipBounds();
SkIRect device = canvas->getDeviceClipBounds();
printf("local bounds %g %g %g %g\n", local.fLeft, local.fTop, local.fRight,
local.fBottom);
printf("device bounds %d %d %d %d\n", device.fLeft, device.fTop,
device.fRight, device.fBottom);
FX_RECT clipBox;
driver->GetClipBox(&clipBox);
printf("reported bounds %d %d %d %d\n", clipBox.left, clipBox.top,
clipBox.right, clipBox.bottom);
#endif // SHOW_SKIA_PATH
}
void DebugShowSkiaDrawPath(CFX_SkiaDeviceDriver* driver,
const SkCanvas* canvas,
const SkPaint& paint,
const SkPath& path) {
#if SHOW_SKIA_PATH
DebugShowSkiaPaint(paint);
DebugShowCanvasClip(driver, canvas);
DebugShowSkiaPath(path);
printf("\n");
#endif // SHOW_SKIA_PATH
}
void DebugShowSkiaDrawRect(CFX_SkiaDeviceDriver* driver,
const SkCanvas* canvas,
const SkPaint& paint,
const SkRect& rect) {
#if SHOW_SKIA_PATH
DebugShowSkiaPaint(paint);
DebugShowCanvasClip(driver, canvas);
printf("rect %g %g %g %g\n", rect.fLeft, rect.fTop, rect.fRight,
rect.fBottom);
#endif // SHOW_SKIA_PATH
}
void DebugValidate(const RetainPtr<CFX_DIBitmap>& bitmap) {
#if DCHECK_IS_ON()
DCHECK(bitmap);
DCHECK(bitmap->GetBPP() == 8 || bitmap->GetBPP() == 32);
#endif
}
SkColorType Get32BitSkColorType(bool is_rgb_byte_order) {
return is_rgb_byte_order ? kRGBA_8888_SkColorType : kBGRA_8888_SkColorType;
}
SkPathFillType GetAlternateOrWindingFillType(
const CFX_FillRenderOptions& fill_options) {
// TODO(thestig): This function should be able to assert
// fill_options.fill_type != CFX_FillRenderOptions::FillType::kNoFill.
return fill_options.fill_type == CFX_FillRenderOptions::FillType::kEvenOdd
? SkPathFillType::kEvenOdd
: SkPathFillType::kWinding;
}
SkFont::Edging GetFontEdgingType(const CFX_TextRenderOptions& text_options) {
if (text_options.aliasing_type == CFX_TextRenderOptions::kAliasing)
return SkFont::Edging::kAlias;
if (text_options.aliasing_type == CFX_TextRenderOptions::kAntiAliasing)
return SkFont::Edging::kAntiAlias;
DCHECK_EQ(text_options.aliasing_type, CFX_TextRenderOptions::kLcd);
return SkFont::Edging::kSubpixelAntiAlias;
}
bool IsPathAPoint(const SkPath& path) {
if (path.isEmpty())
return false;
if (path.countPoints() == 1)
return true;
for (int i = 0; i < path.countPoints() - 1; ++i) {
if (path.getPoint(i) != path.getPoint(i + 1))
return false;
}
return true;
}
SkPath BuildPath(const CFX_Path& path) {
SkPath sk_path;
pdfium::span<const CFX_Path::Point> points = path.GetPoints();
for (size_t i = 0; i < points.size(); ++i) {
const CFX_PointF& point = points[i].m_Point;
CFX_Path::Point::Type point_type = points[i].m_Type;
if (point_type == CFX_Path::Point::Type::kMove) {
sk_path.moveTo(point.x, point.y);
} else if (point_type == CFX_Path::Point::Type::kLine) {
sk_path.lineTo(point.x, point.y);
} else if (point_type == CFX_Path::Point::Type::kBezier) {
const CFX_PointF& point2 = points[i + 1].m_Point;
const CFX_PointF& point3 = points[i + 2].m_Point;
sk_path.cubicTo(point.x, point.y, point2.x, point2.y, point3.x, point3.y);
i += 2;
}
if (points[i].m_CloseFigure)
sk_path.close();
}
return sk_path;
}
SkMatrix ToSkMatrix(const CFX_Matrix& m) {
SkMatrix skMatrix;
skMatrix.setAll(m.a, m.c, m.e, m.b, m.d, m.f, 0, 0, 1);
return skMatrix;
}
// use when pdf's y-axis points up instead of down
SkMatrix ToFlippedSkMatrix(const CFX_Matrix& m, SkScalar flip) {
SkMatrix skMatrix;
skMatrix.setAll(m.a * flip, -m.c * flip, m.e, m.b * flip, -m.d * flip, m.f, 0,
0, 1);
return skMatrix;
}
SkBlendMode GetSkiaBlendMode(BlendMode blend_type) {
switch (blend_type) {
case BlendMode::kMultiply:
return SkBlendMode::kMultiply;
case BlendMode::kScreen:
return SkBlendMode::kScreen;
case BlendMode::kOverlay:
return SkBlendMode::kOverlay;
case BlendMode::kDarken:
return SkBlendMode::kDarken;
case BlendMode::kLighten:
return SkBlendMode::kLighten;
case BlendMode::kColorDodge:
return SkBlendMode::kColorDodge;
case BlendMode::kColorBurn:
return SkBlendMode::kColorBurn;
case BlendMode::kHardLight:
return SkBlendMode::kHardLight;
case BlendMode::kSoftLight:
return SkBlendMode::kSoftLight;
case BlendMode::kDifference:
return SkBlendMode::kDifference;
case BlendMode::kExclusion:
return SkBlendMode::kExclusion;
case BlendMode::kHue:
return SkBlendMode::kHue;
case BlendMode::kSaturation:
return SkBlendMode::kSaturation;
case BlendMode::kColor:
return SkBlendMode::kColor;
case BlendMode::kLuminosity:
return SkBlendMode::kLuminosity;
case BlendMode::kNormal:
return SkBlendMode::kSrcOver;
}
}
// Add begin & end colors into `colors` array for each gradient transition.
//
// `is_encode_reversed` must be set to true when the parent function of `func`
// has an Encode array, and the matching pair of encode values for `func` are
// in decreasing order.
bool AddColors(const CPDF_ExpIntFunc* func,
DataVector<SkColor>& colors,
bool is_encode_reversed) {
if (func->InputCount() != 1) {
return false;
}
if (func->GetExponent() != 1) {
return false;
}
if (func->GetOrigOutputs() != 3) {
return false;
}
pdfium::span<const float> begin_values = func->GetBeginValues();
pdfium::span<const float> end_values = func->GetEndValues();
if (is_encode_reversed)
std::swap(begin_values, end_values);
colors.push_back(SkColorSetARGB(0xFF,
SkUnitScalarClampToByte(begin_values[0]),
SkUnitScalarClampToByte(begin_values[1]),
SkUnitScalarClampToByte(begin_values[2])));
colors.push_back(SkColorSetARGB(0xFF, SkUnitScalarClampToByte(end_values[0]),
SkUnitScalarClampToByte(end_values[1]),
SkUnitScalarClampToByte(end_values[2])));
return true;
}
uint8_t FloatToByte(float f) {
DCHECK(f >= 0);
DCHECK(f <= 1);
return (uint8_t)(f * 255.99f);
}
bool AddSamples(const CPDF_SampledFunc* func,
DataVector<SkColor>& colors,
DataVector<SkScalar>& pos) {
if (func->InputCount() != 1) {
return false;
}
if (func->OutputCount() != 3) { // expect rgb
return false;
}
if (func->GetEncodeInfo().empty()) {
return false;
}
const CPDF_SampledFunc::SampleEncodeInfo& encode_info =
func->GetEncodeInfo()[0];
if (encode_info.encode_min != 0) {
return false;
}
if (encode_info.encode_max != encode_info.sizes - 1) {
return false;
}
uint32_t sample_size = func->GetBitsPerSample();
uint32_t sample_count = encode_info.sizes;
if (sample_count != 1U << sample_size) {
return false;
}
if (func->GetSampleStream()->GetSize() < sample_count * 3 * sample_size / 8) {
return false;
}
float colors_min[3];
float colors_max[3];
for (int i = 0; i < 3; ++i) {
colors_min[i] = func->GetRange(i * 2);
colors_max[i] = func->GetRange(i * 2 + 1);
}
pdfium::span<const uint8_t> sample_data = func->GetSampleStream()->GetSpan();
CFX_BitStream bitstream(sample_data);
for (uint32_t i = 0; i < sample_count; ++i) {
float float_colors[3];
for (uint32_t j = 0; j < 3; ++j) {
float sample = static_cast<float>(bitstream.GetBits(sample_size));
float interp = sample / (sample_count - 1);
float_colors[j] =
colors_min[j] + (colors_max[j] - colors_min[j]) * interp;
}
colors.push_back(SkPackARGB32NoCheck(0xFF, FloatToByte(float_colors[0]),
FloatToByte(float_colors[1]),
FloatToByte(float_colors[2])));
pos.push_back(static_cast<float>(i) / (sample_count - 1));
}
return true;
}
bool AddStitching(const CPDF_StitchFunc* func,
DataVector<SkColor>& colors,
DataVector<SkScalar>& pos) {
float bounds_start = func->GetDomain(0);
const auto& sub_functions = func->GetSubFunctions();
const size_t sub_function_count = sub_functions.size();
for (size_t i = 0; i < sub_function_count; ++i) {
const CPDF_ExpIntFunc* sub_func = sub_functions[i]->ToExpIntFunc();
if (!sub_func)
return false;
// Check if the matching encode values are reversed
bool is_encode_reversed =
func->GetEncode(2 * i) > func->GetEncode(2 * i + 1);
if (!AddColors(sub_func, colors, is_encode_reversed)) {
return false;
}
float bounds_end =
i < sub_function_count - 1 ? func->GetBound(i + 1) : func->GetDomain(1);
pos.push_back(bounds_start);
pos.push_back(bounds_end);
bounds_start = bounds_end;
}
return true;
}
// see https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line
SkScalar LineSide(const SkPoint line[2], const SkPoint& pt) {
return (line[1].fY - line[0].fY) * pt.fX - (line[1].fX - line[0].fX) * pt.fY +
line[1].fX * line[0].fY - line[1].fY * line[0].fX;
}
SkPoint IntersectSides(const SkPoint& parallelPt,
const SkVector& paraRay,
const SkPoint& perpendicularPt) {
SkVector perpRay = {paraRay.fY, -paraRay.fX};
SkScalar denom = perpRay.fY * paraRay.fX - paraRay.fY * perpRay.fX;
if (!denom) {
SkPoint zeroPt = {0, 0};
return zeroPt;
}
SkVector ab0 = parallelPt - perpendicularPt;
SkScalar numerA = ab0.fY * perpRay.fX - perpRay.fY * ab0.fX;
numerA /= denom;
SkPoint result = {parallelPt.fX + paraRay.fX * numerA,
parallelPt.fY + paraRay.fY * numerA};
return result;
}
void ClipAngledGradient(const SkPoint pts[2],
SkPoint rectPts[4],
bool clipStart,
bool clipEnd,
SkPath* clip) {
// find the corners furthest from the gradient perpendiculars
SkScalar minPerpDist = SK_ScalarMax;
SkScalar maxPerpDist = SK_ScalarMin;
int minPerpPtIndex = -1;
int maxPerpPtIndex = -1;
SkVector slope = pts[1] - pts[0];
SkPoint startPerp[2] = {pts[0], {pts[0].fX + slope.fY, pts[0].fY - slope.fX}};
SkPoint endPerp[2] = {pts[1], {pts[1].fX + slope.fY, pts[1].fY - slope.fX}};
for (int i = 0; i < 4; ++i) {
SkScalar sDist = LineSide(startPerp, rectPts[i]);
SkScalar eDist = LineSide(endPerp, rectPts[i]);
if (sDist * eDist <= 0) // if the signs are different,
continue; // the point is inside the gradient
if (sDist < 0) {
SkScalar smaller = std::min(sDist, eDist);
if (minPerpDist > smaller) {
minPerpDist = smaller;
minPerpPtIndex = i;
}
} else {
SkScalar larger = std::max(sDist, eDist);
if (maxPerpDist < larger) {
maxPerpDist = larger;
maxPerpPtIndex = i;
}
}
}
if (minPerpPtIndex < 0 && maxPerpPtIndex < 0) // nothing's outside
return;
// determine if negative distances are before start or after end
SkPoint beforeStart = {pts[0].fX * 2 - pts[1].fX, pts[0].fY * 2 - pts[1].fY};
bool beforeNeg = LineSide(startPerp, beforeStart) < 0;
int noClipStartIndex = maxPerpPtIndex;
int noClipEndIndex = minPerpPtIndex;
if (beforeNeg)
std::swap(noClipStartIndex, noClipEndIndex);
if ((!clipStart && noClipStartIndex < 0) ||
(!clipEnd && noClipEndIndex < 0)) {
return;
}
const SkPoint& startEdgePt = clipStart ? pts[0] : rectPts[noClipStartIndex];
const SkPoint& endEdgePt = clipEnd ? pts[1] : rectPts[noClipEndIndex];
// find the corners that bound the gradient
SkScalar minDist = SK_ScalarMax;
SkScalar maxDist = SK_ScalarMin;
int minBounds = -1;
int maxBounds = -1;
for (int i = 0; i < 4; ++i) {
SkScalar dist = LineSide(pts, rectPts[i]);
if (minDist > dist) {
minDist = dist;
minBounds = i;
}
if (maxDist < dist) {
maxDist = dist;
maxBounds = i;
}
}
if (minBounds < 0 || maxBounds < 0)
return;
if (minBounds == maxBounds)
return;
// construct a clip parallel to the gradient that goes through
// rectPts[minBounds] and rectPts[maxBounds] and perpendicular to the
// gradient that goes through startEdgePt, endEdgePt.
clip->moveTo(IntersectSides(rectPts[minBounds], slope, startEdgePt));
clip->lineTo(IntersectSides(rectPts[minBounds], slope, endEdgePt));
clip->lineTo(IntersectSides(rectPts[maxBounds], slope, endEdgePt));
clip->lineTo(IntersectSides(rectPts[maxBounds], slope, startEdgePt));
}
// Converts a stroking path to scanlines
void PaintStroke(SkPaint* spaint,
const CFX_GraphStateData* graph_state,
const SkMatrix& matrix,
const CFX_FillRenderOptions& fill_options) {
SkPaint::Cap cap;
switch (graph_state->m_LineCap) {
case CFX_GraphStateData::LineCap::kRound:
cap = SkPaint::kRound_Cap;
break;
case CFX_GraphStateData::LineCap::kSquare:
cap = SkPaint::kSquare_Cap;
break;
default:
cap = SkPaint::kButt_Cap;
break;
}
SkPaint::Join join;
switch (graph_state->m_LineJoin) {
case CFX_GraphStateData::LineJoin::kRound:
join = SkPaint::kRound_Join;
break;
case CFX_GraphStateData::LineJoin::kBevel:
join = SkPaint::kBevel_Join;
break;
default:
join = SkPaint::kMiter_Join;
break;
}
SkMatrix inverse;
if (!matrix.invert(&inverse)) {
return; // give up if the matrix is degenerate, and not invertable
}
inverse.set(SkMatrix::kMTransX, 0);
inverse.set(SkMatrix::kMTransY, 0);
SkVector deviceUnits[2] = {{0, 1}, {1, 0}};
inverse.mapPoints(deviceUnits, std::size(deviceUnits));
float width = fill_options.zero_area
? 0.0f
: std::max(graph_state->m_LineWidth,
std::min(deviceUnits[0].length(),
deviceUnits[1].length()));
if (!graph_state->m_DashArray.empty()) {
size_t count = (graph_state->m_DashArray.size() + 1) / 2;
DataVector<SkScalar> intervals(count * 2);
// Set dash pattern
for (size_t i = 0; i < count; i++) {
float on = graph_state->m_DashArray[i * 2];
if (on <= 0.000001f) {
on = 0.1f;
}
float off = i * 2 + 1 == graph_state->m_DashArray.size()
? on
: graph_state->m_DashArray[i * 2 + 1];
off = std::max(off, 0.0f);
intervals[i * 2] = on;
intervals[i * 2 + 1] = off;
}
spaint->setPathEffect(SkDashPathEffect::Make(
intervals.data(), pdfium::checked_cast<int>(intervals.size()),
graph_state->m_DashPhase));
}
spaint->setStyle(SkPaint::kStroke_Style);
spaint->setAntiAlias(!fill_options.aliased_path);
spaint->setStrokeWidth(width);
spaint->setStrokeMiter(graph_state->m_MiterLimit);
spaint->setStrokeCap(cap);
spaint->setStrokeJoin(join);
}
void SetBitmapMatrix(const CFX_Matrix& m,
int width,
int height,
SkMatrix* skMatrix) {
skMatrix->setAll(m.a / width, -m.c / height, m.c + m.e, m.b / width,
-m.d / height, m.d + m.f, 0, 0, 1);
}
void SetBitmapPaint(bool is_mask,
bool anti_alias,
float alpha,
uint32_t argb,
BlendMode blend_type,
SkPaint* paint) {
DCHECK_GE(alpha, 0.0f);
DCHECK_LE(alpha, 1.0f);
if (is_mask) {
paint->setColor(argb);
} else if (alpha != 1.0f) {
paint->setAlphaf(alpha);
}
paint->setAntiAlias(anti_alias);
paint->setBlendMode(GetSkiaBlendMode(blend_type));
}
void SetBitmapPaintForMerge(bool is_mask,
bool anti_alias,
float alpha,
BlendMode blend_type,
SkPaint* paint) {
if (is_mask) {
paint->setColorFilter(SkColorFilters::Blend(0xFFFFFFFF, SkBlendMode::kSrc));
}
paint->setAlphaf(alpha);
paint->setAntiAlias(anti_alias);
paint->setBlendMode(GetSkiaBlendMode(blend_type));
}
// Makes a bitmap filled with a solid color for debugging with `SkPicture`.
RetainPtr<CFX_DIBitmap> MakeDebugBitmap(int width, int height, uint32_t color) {
auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!bitmap->Create(width, height, FXDIB_Format::kArgb))
return nullptr;
bitmap->Clear(color);
return bitmap;
}
bool HasRSX(pdfium::span<const TextCharPos> char_pos,
float* scaleXPtr,
bool* oneAtATimePtr) {
bool useRSXform = false;
bool oneAtATime = false;
float scaleX = 1;
for (const TextCharPos& cp : char_pos) {
if (!cp.m_bGlyphAdjust) {
continue;
}
bool upright = 0 == cp.m_AdjustMatrix[1] && 0 == cp.m_AdjustMatrix[2];
if (cp.m_AdjustMatrix[0] != cp.m_AdjustMatrix[3]) {
if (upright && 1 == cp.m_AdjustMatrix[3]) {
if (1 == scaleX) {
scaleX = cp.m_AdjustMatrix[0];
} else if (scaleX != cp.m_AdjustMatrix[0]) {
oneAtATime = true;
}
} else {
oneAtATime = true;
}
} else if (cp.m_AdjustMatrix[1] != -cp.m_AdjustMatrix[2]) {
oneAtATime = true;
} else {
useRSXform = true;
}
}
*oneAtATimePtr = oneAtATime;
*scaleXPtr = oneAtATime ? 1 : scaleX;
return oneAtATime ? false : useRSXform;
}
} // namespace
// static
std::unique_ptr<CFX_SkiaDeviceDriver> CFX_SkiaDeviceDriver::Create(
RetainPtr<CFX_DIBitmap> pBitmap,
bool bRgbByteOrder,
RetainPtr<CFX_DIBitmap> pBackdropBitmap,
bool bGroupKnockout) {
auto driver = pdfium::WrapUnique(
new CFX_SkiaDeviceDriver(std::move(pBitmap), bRgbByteOrder,
std::move(pBackdropBitmap), bGroupKnockout));
if (!driver->m_pCanvas) {
return nullptr;
}
return driver;
}
// static
std::unique_ptr<CFX_SkiaDeviceDriver> CFX_SkiaDeviceDriver::Create(
SkCanvas* canvas) {
if (!canvas) {
return nullptr;
}
auto driver = pdfium::WrapUnique(new CFX_SkiaDeviceDriver(canvas));
if (!driver->m_pBitmap || !driver->m_pBackdropBitmap) {
return nullptr;
}
return driver;
}
CFX_SkiaDeviceDriver::CFX_SkiaDeviceDriver(
RetainPtr<CFX_DIBitmap> pBitmap,
bool bRgbByteOrder,
RetainPtr<CFX_DIBitmap> pBackdropBitmap,
bool bGroupKnockout)
: m_pBitmap(std::move(pBitmap)),
m_pBackdropBitmap(pBackdropBitmap),
m_bRgbByteOrder(bRgbByteOrder),
m_bGroupKnockout(bGroupKnockout) {
SkColorType color_type;
const int bpp = m_pBitmap->GetBPP();
if (bpp == 8) {
color_type = m_pBitmap->IsAlphaFormat() || m_pBitmap->IsMaskFormat()
? kAlpha_8_SkColorType
: kGray_8_SkColorType;
} else if (bpp == 24) {
DCHECK_EQ(m_pBitmap->GetFormat(), FXDIB_Format::kRgb);
// Save the input bitmap as `m_pOriginalBitmap` and save its 32 bpp
// equivalent at `m_pBitmap` for Skia's internal process.
m_pOriginalBitmap = std::move(m_pBitmap);
m_pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!m_pBitmap->Copy(m_pOriginalBitmap) ||
!m_pBitmap->ConvertFormat(FXDIB_Format::kArgb)) {
// Skip creating SkCanvas if the 32-bpp bitmap creation fails.
// CFX_SkiaDeviceDriver::Create() will check for the missing `m_pCanvas`
// and not use `this`.
// Also reset `m_pOriginalBitmap` so the dtor does not try to transfer
// `m_pBitmap` back to `m_pOriginalBitmap`.
m_pOriginalBitmap.Reset();
return;
}
color_type = Get32BitSkColorType(bRgbByteOrder);
} else {
DCHECK_EQ(bpp, 32);
color_type = Get32BitSkColorType(bRgbByteOrder);
}
SkImageInfo imageInfo =
SkImageInfo::Make(m_pBitmap->GetWidth(), m_pBitmap->GetHeight(),
color_type, kPremul_SkAlphaType);
surface_ = SkSurfaces::WrapPixels(
imageInfo, m_pBitmap->GetWritableBuffer().data(), m_pBitmap->GetPitch());
m_pCanvas = surface_->getCanvas();
}
CFX_SkiaDeviceDriver::CFX_SkiaDeviceDriver(SkCanvas* canvas)
: m_pCanvas(canvas), m_bGroupKnockout(false) {
int width = m_pCanvas->imageInfo().width();
int height = m_pCanvas->imageInfo().height();
DCHECK_EQ(kUnknown_SkColorType, m_pCanvas->imageInfo().colorType());
constexpr uint32_t kMagenta = 0xffff00ff;
constexpr uint32_t kGreen = 0xff00ff00;
m_pBitmap = MakeDebugBitmap(width, height, kMagenta);
m_pBackdropBitmap = MakeDebugBitmap(width, height, kGreen);
}
CFX_SkiaDeviceDriver::~CFX_SkiaDeviceDriver() {
// Convert and transfer the internal processed result to the original 24 bpp
// bitmap provided by the render device.
if (m_pOriginalBitmap && m_pBitmap->ConvertFormat(FXDIB_Format::kRgb)) {
CHECK(SyncInternalBitmaps());
}
}
bool CFX_SkiaDeviceDriver::DrawDeviceText(
pdfium::span<const TextCharPos> pCharPos,
CFX_Font* pFont,
const CFX_Matrix& mtObject2Device,
float font_size,
uint32_t color,
const CFX_TextRenderOptions& options) {
// `SkTextBlob` is built from `pFont`'s font data. If `pFont` doesn't contain
// any font data, each text blob will have zero area to be drawn and the
// drawing command will be rejected. In this case, we fall back to drawing
// characters by their glyph bitmaps.
if (pFont->GetFontSpan().empty())
return false;
if (TryDrawText(pCharPos, pFont, mtObject2Device, font_size, color,
options)) {
return true;
}
sk_sp<SkTypeface> typeface(SkSafeRef(pFont->GetDeviceCache()));
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(color);
SkFont font;
font.setTypeface(typeface);
font.setEmbolden(pFont->IsSubstFontBold());
font.setHinting(SkFontHinting::kNone);
font.setSize(SkTAbs(font_size));
font.setSubpixel(true);
font.setSkewX(tanf(pFont->GetSubstFontItalicAngle() * FXSYS_PI / 180.0));
font.setEdging(GetFontEdgingType(options));
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
const SkScalar horizontal_flip = font_size < 0 ? -1 : 1;
const SkScalar vertical_flip = pFont->IsVertical() ? -1 : 1;
SkMatrix skMatrix = ToFlippedSkMatrix(mtObject2Device, horizontal_flip);
m_pCanvas->concat(skMatrix);
DataVector<SkPoint> positions(pCharPos.size());
DataVector<uint16_t> glyphs(pCharPos.size());
for (size_t index = 0; index < pCharPos.size(); ++index) {
const TextCharPos& cp = pCharPos[index];
positions[index] = {cp.m_Origin.x * horizontal_flip,
cp.m_Origin.y * vertical_flip};
glyphs[index] = static_cast<uint16_t>(cp.m_GlyphIndex);
#if BUILDFLAG(IS_APPLE)
if (cp.m_ExtGID)
glyphs[index] = static_cast<uint16_t>(cp.m_ExtGID);
#endif
}
for (size_t index = 0; index < pCharPos.size(); ++index) {
const TextCharPos& cp = pCharPos[index];
if (cp.m_bGlyphAdjust) {
if (0 == cp.m_AdjustMatrix[1] && 0 == cp.m_AdjustMatrix[2] &&
1 == cp.m_AdjustMatrix[3]) {
font.setScaleX(cp.m_AdjustMatrix[0]);
auto blob =
SkTextBlob::MakeFromText(&glyphs[index], sizeof(glyphs[index]),
font, SkTextEncoding::kGlyphID);
m_pCanvas->drawTextBlob(blob, positions[index].fX, positions[index].fY,
paint);
font.setScaleX(SkIntToScalar(1));
} else {
SkAutoCanvasRestore scoped_save_restore2(m_pCanvas, /*doSave=*/true);
SkMatrix adjust;
adjust.preTranslate(positions[index].fX, -positions[index].fY);
adjust.setScaleX(cp.m_AdjustMatrix[0]);
adjust.setSkewX(cp.m_AdjustMatrix[1]);
adjust.setSkewY(cp.m_AdjustMatrix[2]);
adjust.setScaleY(cp.m_AdjustMatrix[3]);
m_pCanvas->concat(adjust);
auto blob =
SkTextBlob::MakeFromText(&glyphs[index], sizeof(glyphs[index]),
font, SkTextEncoding::kGlyphID);
m_pCanvas->drawTextBlob(blob, 0, 0, paint);
}
} else {
auto blob =
SkTextBlob::MakeFromText(&glyphs[index], sizeof(glyphs[index]), font,
SkTextEncoding::kGlyphID);
m_pCanvas->drawTextBlob(blob, positions[index].fX, positions[index].fY,
paint);
}
}
return true;
}
// TODO(crbug.com/pdfium/1999): Merge with `DrawDeviceText()` and refactor
// common logic.
// TODO(crbug.com/pdfium/1774): Sometimes the thickness of the glyphs is not
// ideal. Improve text rendering results regarding different font weight.
bool CFX_SkiaDeviceDriver::TryDrawText(pdfium::span<const TextCharPos> char_pos,
const CFX_Font* pFont,
const CFX_Matrix& matrix,
float font_size,
uint32_t color,
const CFX_TextRenderOptions& options) {
float scaleX = 1;
bool oneAtATime = false;
bool hasRSX = HasRSX(char_pos, &scaleX, &oneAtATime);
if (oneAtATime) {
return false;
}
m_charDetails.SetCount(0);
m_rsxform.resize(0);
const size_t original_count = m_charDetails.Count();
FX_SAFE_SIZE_T safe_count = original_count;
safe_count += char_pos.size();
const size_t total_count = safe_count.ValueOrDie();
m_charDetails.SetCount(total_count);
if (hasRSX) {
m_rsxform.resize(total_count);
}
const SkScalar horizontal_flip = font_size < 0 ? -1 : 1;
const SkScalar vertical_flip = pFont->IsVertical() ? -1 : 1;
for (size_t index = 0; index < char_pos.size(); ++index) {
const TextCharPos& cp = char_pos[index];
size_t cur_index = index + original_count;
m_charDetails.SetPositionAt(cur_index, {cp.m_Origin.x * horizontal_flip,
cp.m_Origin.y * vertical_flip});
m_charDetails.SetGlyphAt(cur_index, static_cast<uint16_t>(cp.m_GlyphIndex));
m_charDetails.SetFontCharWidthAt(cur_index, cp.m_FontCharWidth);
#if BUILDFLAG(IS_APPLE)
if (cp.m_ExtGID) {
m_charDetails.SetGlyphAt(cur_index, static_cast<uint16_t>(cp.m_ExtGID));
}
#endif
}
if (hasRSX) {
const DataVector<SkPoint>& positions = m_charDetails.GetPositions();
for (size_t index = 0; index < char_pos.size(); ++index) {
const TextCharPos& cp = char_pos[index];
SkRSXform& rsxform = m_rsxform[index + original_count];
if (cp.m_bGlyphAdjust) {
rsxform.fSCos = cp.m_AdjustMatrix[0];
rsxform.fSSin = cp.m_AdjustMatrix[1];
rsxform.fTx = cp.m_AdjustMatrix[0] * positions[index].fX;
rsxform.fTy = -cp.m_AdjustMatrix[3] * positions[index].fY;
} else {
rsxform.fSCos = 1;
rsxform.fSSin = 0;
rsxform.fTx = positions[index].fX;
rsxform.fTy = positions[index].fY;
}
}
}
SkPaint skPaint;
skPaint.setAntiAlias(true);
skPaint.setColor(color);
SkFont font;
if (pFont->GetFaceRec()) { // exclude placeholder test fonts
font.setTypeface(sk_ref_sp(pFont->GetDeviceCache()));
}
font.setEmbolden(pFont->IsSubstFontBold());
font.setHinting(SkFontHinting::kNone);
font.setScaleX(scaleX);
font.setSkewX(tanf(pFont->GetSubstFontItalicAngle() * FXSYS_PI / 180.0));
font.setSize(SkTAbs(font_size));
font.setSubpixel(true);
font.setEdging(GetFontEdgingType(options));
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
m_pCanvas->concat(ToFlippedSkMatrix(matrix, horizontal_flip));
const DataVector<uint16_t>& glyphs = m_charDetails.GetGlyphs();
if (!m_rsxform.empty()) {
sk_sp<SkTextBlob> blob = SkTextBlob::MakeFromRSXform(
glyphs.data(), glyphs.size() * sizeof(uint16_t), m_rsxform.data(), font,
SkTextEncoding::kGlyphID);
m_pCanvas->drawTextBlob(blob, 0, 0, skPaint);
return true;
}
const DataVector<SkPoint>& positions = m_charDetails.GetPositions();
const DataVector<uint32_t>& widths = m_charDetails.GetFontCharWidths();
for (size_t i = 0; i < m_charDetails.Count(); ++i) {
const uint32_t font_glyph_width = pFont->GetGlyphWidth(glyphs[i]);
const uint32_t pdf_glyph_width = widths[i];
if (pdf_glyph_width > 0 && font_glyph_width > 0) {
// Scale the glyph from its default width `pdf_glyph_width` to the
// targeted width `pdf_glyph_width`.
font.setScaleX(scaleX * SkIntToScalar(pdf_glyph_width) /
font_glyph_width);
} else {
font.setScaleX(scaleX);
}
auto blob =
SkTextBlob::MakeFromPosText(&glyphs[i], sizeof(uint16_t), &positions[i],
font, SkTextEncoding::kGlyphID);
m_pCanvas->drawTextBlob(blob, 0, 0, skPaint);
}
return true;
}
int CFX_SkiaDeviceDriver::GetDriverType() const {
return 1;
}
bool CFX_SkiaDeviceDriver::MultiplyAlpha(float alpha) {
CHECK_GE(alpha, 0.0f);
CHECK_LE(alpha, 1.0f);
if (alpha != 1.0f) {
SkPaint paint;
paint.setAlphaf(alpha);
paint.setBlendMode(SkBlendMode::kDstIn);
m_pCanvas->drawPaint(paint);
}
return true;
}
bool CFX_SkiaDeviceDriver::MultiplyAlphaMask(
RetainPtr<const CFX_DIBitmap> mask) {
CHECK_EQ(FXDIB_Format::k8bppMask, mask->GetFormat());
sk_sp<SkImage> skia_mask = mask->RealizeSkImage();
if (!skia_mask) {
return false;
}
DCHECK_EQ(skia_mask->colorType(), kAlpha_8_SkColorType);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kDstIn);
m_pCanvas->drawImageRect(skia_mask,
SkRect::Make(m_pCanvas->imageInfo().bounds()),
SkSamplingOptions(), &paint);
return true;
}
DeviceType CFX_SkiaDeviceDriver::GetDeviceType() const {
return DeviceType::kDisplay;
}
int CFX_SkiaDeviceDriver::GetDeviceCaps(int caps_id) const {
switch (caps_id) {
case FXDC_PIXEL_WIDTH:
return m_pCanvas->imageInfo().width();
case FXDC_PIXEL_HEIGHT:
return m_pCanvas->imageInfo().height();
case FXDC_BITS_PIXEL:
return 32;
case FXDC_HORZ_SIZE:
case FXDC_VERT_SIZE:
return 0;
case FXDC_RENDER_CAPS:
return FXRC_GET_BITS | FXRC_ALPHA_PATH | FXRC_ALPHA_IMAGE |
FXRC_BLEND_MODE | FXRC_SOFT_CLIP | FXRC_ALPHA_OUTPUT |
FXRC_FILLSTROKE_PATH | FXRC_SHADING;
default:
NOTREACHED_NORETURN();
}
}
void CFX_SkiaDeviceDriver::SaveState() {
m_pCanvas->save();
}
void CFX_SkiaDeviceDriver::RestoreState(bool bKeepSaved) {
m_pCanvas->restore();
if (bKeepSaved) {
m_pCanvas->save();
}
}
bool CFX_SkiaDeviceDriver::SetClip_PathFill(
const CFX_Path& path, // path info
const CFX_Matrix* pObject2Device, // flips object's y-axis
const CFX_FillRenderOptions& fill_options) {
m_FillOptions = fill_options;
const CFX_Matrix& deviceMatrix =
pObject2Device ? *pObject2Device : CFX_Matrix();
SkPath skClipPath;
if (path.GetPoints().size() == 5 || path.GetPoints().size() == 4) {
std::optional<CFX_FloatRect> maybe_rectf = path.GetRect(&deviceMatrix);
if (maybe_rectf.has_value()) {
CFX_FloatRect& rectf = maybe_rectf.value();
rectf.Intersect(CFX_FloatRect(0, 0,
(float)GetDeviceCaps(FXDC_PIXEL_WIDTH),
(float)GetDeviceCaps(FXDC_PIXEL_HEIGHT)));
FX_RECT outer = rectf.GetOuterRect();
// note that PDF's y-axis goes up; Skia's y-axis goes down
skClipPath.addRect({(float)outer.left, (float)outer.bottom,
(float)outer.right, (float)outer.top});
}
}
if (skClipPath.isEmpty()) {
skClipPath = BuildPath(path);
skClipPath.setFillType(GetAlternateOrWindingFillType(fill_options));
skClipPath.transform(ToSkMatrix(deviceMatrix));
DebugShowSkiaPath(skClipPath);
}
m_pCanvas->clipPath(skClipPath, SkClipOp::kIntersect, true);
DebugShowCanvasClip(this, m_pCanvas);
return true;
}
bool CFX_SkiaDeviceDriver::SetClip_PathStroke(
const CFX_Path& path, // path info
const CFX_Matrix* pObject2Device, // required transformation
const CFX_GraphStateData* pGraphState // graphic state, for pen attributes
) {
SkPath skPath = BuildPath(path);
SkMatrix skMatrix = ToSkMatrix(*pObject2Device);
SkPaint skPaint;
PaintStroke(&skPaint, pGraphState, skMatrix, CFX_FillRenderOptions());
SkPath dst_path;
skpathutils::FillPathWithPaint(skPath, skPaint, &dst_path);
dst_path.transform(skMatrix);
m_pCanvas->clipPath(dst_path, SkClipOp::kIntersect, true);
DebugShowCanvasClip(this, m_pCanvas);
return true;
}
// TODO(crbug.com/pdfium/1963): `blend_type` isn't used?
bool CFX_SkiaDeviceDriver::DrawPath(
const CFX_Path& path, // path info
const CFX_Matrix* pObject2Device, // optional transformation
const CFX_GraphStateData* pGraphState, // graphic state, for pen attributes
uint32_t fill_color, // fill color
uint32_t stroke_color, // stroke color
const CFX_FillRenderOptions& fill_options,
BlendMode blend_type) {
m_FillOptions = fill_options;
SkPath skia_path = BuildPath(path);
skia_path.setFillType(GetAlternateOrWindingFillType(fill_options));
SkMatrix skMatrix = pObject2Device ? ToSkMatrix(*pObject2Device) : SkMatrix();
SkPaint skPaint;
skPaint.setAntiAlias(!fill_options.aliased_path);
if (fill_options.full_cover) {
skPaint.setBlendMode(SkBlendMode::kPlus);
}
int stroke_alpha = FXARGB_A(stroke_color);
if (stroke_alpha) {
const CFX_GraphStateData& graph_state =
pGraphState ? *pGraphState : CFX_GraphStateData();
PaintStroke(&skPaint, &graph_state, skMatrix, fill_options);
}
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
m_pCanvas->concat(skMatrix);
bool do_stroke = true;
if (fill_options.fill_type != CFX_FillRenderOptions::FillType::kNoFill &&
fill_color) {
SkPath strokePath;
const SkPath* fillPath = &skia_path;
if (stroke_alpha) {
if (m_bGroupKnockout) {
skpathutils::FillPathWithPaint(skia_path, skPaint, &strokePath);
if (stroke_color == fill_color &&
Op(skia_path, strokePath, SkPathOp::kUnion_SkPathOp, &strokePath)) {
fillPath = &strokePath;
do_stroke = false;
} else if (Op(skia_path, strokePath, SkPathOp::kDifference_SkPathOp,
&strokePath)) {
fillPath = &strokePath;
}
}
}
skPaint.setStyle(SkPaint::kFill_Style);
skPaint.setColor(fill_color);
DebugShowSkiaDrawPath(this, m_pCanvas, skPaint, *fillPath);
m_pCanvas->drawPath(*fillPath, skPaint);
}
if (stroke_alpha && do_stroke) {
skPaint.setStyle(SkPaint::kStroke_Style);
skPaint.setColor(stroke_color);
if (!skia_path.isLastContourClosed() && IsPathAPoint(skia_path)) {
DCHECK_GE(skia_path.countPoints(), 1);
m_pCanvas->drawPoint(skia_path.getPoint(0), skPaint);
} else if (IsPathAPoint(skia_path) &&
skPaint.getStrokeCap() != SkPaint::kRound_Cap) {
// Do nothing. A closed 0-length closed path can be rendered only if
// its line cap type is round.
} else {
DebugShowSkiaDrawPath(this, m_pCanvas, skPaint, skia_path);
m_pCanvas->drawPath(skia_path, skPaint);
}
}
return true;
}
bool CFX_SkiaDeviceDriver::DrawCosmeticLine(const CFX_PointF& ptMoveTo,
const CFX_PointF& ptLineTo,
uint32_t color,
BlendMode blend_type) {
return false;
}
bool CFX_SkiaDeviceDriver::FillRectWithBlend(const FX_RECT& rect,
uint32_t fill_color,
BlendMode blend_type) {
SkPaint spaint;
spaint.setAntiAlias(true);
spaint.setColor(fill_color);
spaint.setBlendMode(GetSkiaBlendMode(blend_type));
SkRect srect = SkRect::MakeLTRB(rect.left, std::min(rect.top, rect.bottom),
rect.right, std::max(rect.bottom, rect.top));
DebugShowSkiaDrawRect(this, m_pCanvas, spaint, srect);
m_pCanvas->drawRect(srect, spaint);
return true;
}
bool CFX_SkiaDeviceDriver::DrawShading(const CPDF_ShadingPattern* pPattern,
const CFX_Matrix* pMatrix,
const FX_RECT& clip_rect,
int alpha,
bool bAlphaMode) {
ShadingType shadingType = pPattern->GetShadingType();
if (kAxialShading != shadingType && kRadialShading != shadingType &&
kCoonsPatchMeshShading != shadingType) {
// TODO(caryclark) more types
return false;
}
CPDF_ColorSpace::Family csFamily = pPattern->GetCS()->GetFamily();
if (CPDF_ColorSpace::Family::kDeviceRGB != csFamily &&
CPDF_ColorSpace::Family::kDeviceGray != csFamily) {
return false;
}
const std::vector<std::unique_ptr<CPDF_Function>>& pFuncs =
pPattern->GetFuncs();
size_t nFuncs = pFuncs.size();
if (nFuncs > 1) // TODO(caryclark) remove this restriction
return false;
RetainPtr<const CPDF_Dictionary> pDict =
pPattern->GetShadingObject()->GetDict();
RetainPtr<const CPDF_Array> pCoords = pDict->GetArrayFor("Coords");
if (!pCoords && kCoonsPatchMeshShading != shadingType)
return false;
// TODO(caryclark) Respect Domain[0], Domain[1]. (Don't know what they do
// yet.)
DataVector<SkColor> sk_colors;
DataVector<SkScalar> sk_pos;
for (size_t j = 0; j < nFuncs; j++) {
if (!pFuncs[j])
continue;
if (const CPDF_SampledFunc* pSampledFunc = pFuncs[j]->ToSampledFunc()) {
/* TODO(caryclark)
Type 0 Sampled Functions in PostScript can also have an Order integer
in the dictionary. PDFium doesn't appear to check for this anywhere.
*/
if (!AddSamples(pSampledFunc, sk_colors, sk_pos)) {
return false;
}
} else if (const CPDF_ExpIntFunc* pExpIntFuc = pFuncs[j]->ToExpIntFunc()) {
if (!AddColors(pExpIntFuc, sk_colors, /*is_encode_reversed=*/false)) {
return false;
}
sk_pos.push_back(0);
sk_pos.push_back(1);
} else if (const CPDF_StitchFunc* pStitchFunc = pFuncs[j]->ToStitchFunc()) {
if (!AddStitching(pStitchFunc, sk_colors, sk_pos)) {
return false;
}
} else {
return false;
}
}
RetainPtr<const CPDF_Array> pArray = pDict->GetArrayFor("Extend");
bool clipStart = !pArray || !pArray->GetIntegerAt(0);
bool clipEnd = !pArray || !pArray->GetIntegerAt(1);
SkPaint paint;
paint.setAntiAlias(true);
paint.setAlpha(alpha);
SkMatrix skMatrix = ToSkMatrix(*pMatrix);
SkRect skRect = SkRect::MakeLTRB(clip_rect.left, clip_rect.top,
clip_rect.right, clip_rect.bottom);
SkPath skClip;
SkPath skPath;
if (kAxialShading == shadingType) {
float start_x = pCoords->GetFloatAt(0);
float start_y = pCoords->GetFloatAt(1);
float end_x = pCoords->GetFloatAt(2);
float end_y = pCoords->GetFloatAt(3);
SkPoint pts[] = {{start_x, start_y}, {end_x, end_y}};
skMatrix.mapPoints(pts, std::size(pts));
paint.setShader(SkGradientShader::MakeLinear(
pts, sk_colors.data(), sk_pos.data(),
fxcrt::CollectionSize<int>(sk_colors), SkTileMode::kClamp));
if (clipStart || clipEnd) {
// if the gradient is horizontal or vertical, modify the draw rectangle
if (pts[0].fX == pts[1].fX) { // vertical
if (pts[0].fY > pts[1].fY) {
std::swap(pts[0].fY, pts[1].fY);
std::swap(clipStart, clipEnd);
}
if (clipStart)
skRect.fTop = std::max(skRect.fTop, pts[0].fY);
if (clipEnd)
skRect.fBottom = std::min(skRect.fBottom, pts[1].fY);
} else if (pts[0].fY == pts[1].fY) { // horizontal
if (pts[0].fX > pts[1].fX) {
std::swap(pts[0].fX, pts[1].fX);
std::swap(clipStart, clipEnd);
}
if (clipStart)
skRect.fLeft = std::max(skRect.fLeft, pts[0].fX);
if (clipEnd)
skRect.fRight = std::min(skRect.fRight, pts[1].fX);
} else { // if the gradient is angled and contained by the rect, clip
SkPoint rectPts[4] = {{skRect.fLeft, skRect.fTop},
{skRect.fRight, skRect.fTop},
{skRect.fRight, skRect.fBottom},
{skRect.fLeft, skRect.fBottom}};
ClipAngledGradient(pts, rectPts, clipStart, clipEnd, &skClip);
}
}
skPath.addRect(skRect);
skMatrix.setIdentity();
} else if (kRadialShading == shadingType) {
float start_x = pCoords->GetFloatAt(0);
float start_y = pCoords->GetFloatAt(1);
float start_r = pCoords->GetFloatAt(2);
float end_x = pCoords->GetFloatAt(3);
float end_y = pCoords->GetFloatAt(4);
float end_r = pCoords->GetFloatAt(5);
SkPoint pts[] = {{start_x, start_y}, {end_x, end_y}};
paint.setShader(SkGradientShader::MakeTwoPointConical(
pts[0], start_r, pts[1], end_r, sk_colors.data(), sk_pos.data(),
fxcrt::CollectionSize<int>(sk_colors), SkTileMode::kClamp));
if (clipStart || clipEnd) {
if (clipStart && start_r)
skClip.addCircle(pts[0].fX, pts[0].fY, start_r);
if (clipEnd)
skClip.addCircle(pts[1].fX, pts[1].fY, end_r, SkPathDirection::kCCW);
else
skClip.setFillType(SkPathFillType::kInverseWinding);
skClip.transform(skMatrix);
}
SkMatrix inverse;
if (!skMatrix.invert(&inverse))
return false;
skPath.addRect(skRect);
skPath.transform(inverse);
} else {
DCHECK_EQ(kCoonsPatchMeshShading, shadingType);
RetainPtr<const CPDF_Stream> pStream =
ToStream(pPattern->GetShadingObject());
if (!pStream)
return false;
CPDF_MeshStream stream(shadingType, pPattern->GetFuncs(),
std::move(pStream), pPattern->GetCS());
if (!stream.Load())
return false;
SkPoint cubics[12];
SkColor colors[4];
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
if (!skClip.isEmpty())
m_pCanvas->clipPath(skClip, SkClipOp::kIntersect, true);
m_pCanvas->concat(skMatrix);
while (!stream.IsEOF()) {
uint32_t flag = stream.ReadFlag();
size_t start_point = flag ? 4 : 0;
size_t start_color = flag ? 2 : 0;
if (flag) {
SkPoint temp_cubics[4];
for (size_t i = 0; i < std::size(temp_cubics); ++i) {
temp_cubics[i] = cubics[(flag * 3 + i) % 12];
}
std::copy(std::begin(temp_cubics), std::end(temp_cubics),
std::begin(cubics));
SkColor temp_colors[2] = {colors[flag % 4], colors[(flag + 1) % 4]};
std::copy(std::begin(temp_colors), std::end(temp_colors),
std::begin(colors));
}
for (size_t i = start_point; i < std::size(cubics); ++i) {
CFX_PointF point = stream.ReadCoords();
cubics[i].fX = point.x;
cubics[i].fY = point.y;
}
for (size_t i = start_color; i < std::size(colors); ++i) {
FX_RGB<float> rgb = stream.ReadColor();
colors[i] =
SkColorSetARGB(0xFF, (U8CPU)(rgb.red * 255),
(U8CPU)(rgb.green * 255), (U8CPU)(rgb.blue * 255));
}
m_pCanvas->drawPatch(cubics, colors, /*texCoords=*/nullptr,
SkBlendMode::kDst, paint);
}
return true;
}
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
if (!skClip.isEmpty())
m_pCanvas->clipPath(skClip, SkClipOp::kIntersect, true);
m_pCanvas->concat(skMatrix);
m_pCanvas->drawPath(skPath, paint);
return true;
}
bool CFX_SkiaDeviceDriver::GetClipBox(FX_RECT* pRect) {
SkIRect clip = m_pCanvas->getDeviceClipBounds();
pRect->left = clip.fLeft;
pRect->top = clip.fTop;
pRect->right = clip.fRight;
pRect->bottom = clip.fBottom;
return true;
}
bool CFX_SkiaDeviceDriver::GetDIBits(RetainPtr<CFX_DIBitmap> bitmap,
int left,
int top) {
const uint8_t* input_buffer = m_pBitmap->GetBuffer().data();
if (!input_buffer) {
return true;
}
uint8_t* output_buffer = bitmap->GetWritableBuffer().data();
DCHECK(output_buffer);
SkImageInfo input_info =
SkImageInfo::Make(m_pBitmap->GetWidth(), m_pBitmap->GetHeight(),
SkColorType::kN32_SkColorType, kPremul_SkAlphaType);
sk_sp<SkImage> input = SkImages::RasterFromPixmap(
SkPixmap(input_info, input_buffer, m_pBitmap->GetPitch()),
/*rasterReleaseProc=*/nullptr, /*releaseContext=*/nullptr);
SkImageInfo output_info = SkImageInfo::Make(
bitmap->GetWidth(), bitmap->GetHeight(),
Get32BitSkColorType(m_bRgbByteOrder), kPremul_SkAlphaType);
sk_sp<SkSurface> output =
SkSurfaces::WrapPixels(output_info, output_buffer, bitmap->GetPitch());
output->getCanvas()->drawImage(input, left, top, SkSamplingOptions());
return true;
}
RetainPtr<CFX_DIBitmap> CFX_SkiaDeviceDriver::GetBackDrop() {
return m_pBackdropBitmap;
}
bool CFX_SkiaDeviceDriver::SetDIBits(RetainPtr<const CFX_DIBBase> bitmap,
uint32_t color,
const FX_RECT& src_rect,
int left,
int top,
BlendMode blend_type) {
if (m_pBitmap->GetBuffer().empty()) {
return true;
}
CFX_Matrix matrix = CFX_RenderDevice::GetFlipMatrix(
bitmap->GetWidth(), bitmap->GetHeight(), left, top);
// `bNoSmoothing` prevents linear sampling when rendering bitmaps.
FXDIB_ResampleOptions sampling_options;
sampling_options.bNoSmoothing = true;
return StartDIBitsSkia(std::move(bitmap), src_rect, /*alpha=*/1.0f, color,
matrix, sampling_options, blend_type);
}
bool CFX_SkiaDeviceDriver::StretchDIBits(RetainPtr<const CFX_DIBBase> bitmap,
uint32_t color,
int dest_left,
int dest_top,
int dest_width,
int dest_height,
const FX_RECT* pClipRect,
const FXDIB_ResampleOptions& options,
BlendMode blend_type) {
if (m_pBitmap->GetBuffer().empty())
return true;
CFX_Matrix matrix = CFX_RenderDevice::GetFlipMatrix(dest_width, dest_height,
dest_left, dest_top);
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
SkRect skClipRect = SkRect::MakeLTRB(pClipRect->left, pClipRect->bottom,
pClipRect->right, pClipRect->top);
m_pCanvas->clipRect(skClipRect, SkClipOp::kIntersect, true);
// `bNoSmoothing` prevents linear sampling when rendering bitmaps.
FXDIB_ResampleOptions sampling_options;
sampling_options.bNoSmoothing = true;
FX_RECT rect(0, 0, bitmap->GetWidth(), bitmap->GetHeight());
return StartDIBitsSkia(std::move(bitmap), rect, /*alpha=*/1.0f, color, matrix,
sampling_options, blend_type);
}
bool CFX_SkiaDeviceDriver::StartDIBits(
RetainPtr<const CFX_DIBBase> bitmap,
float alpha,
uint32_t color,
const CFX_Matrix& matrix,
const FXDIB_ResampleOptions& options,
std::unique_ptr<CFX_ImageRenderer>* handle,
BlendMode blend_type) {
FX_RECT rect(0, 0, bitmap->GetWidth(), bitmap->GetHeight());
return StartDIBitsSkia(std::move(bitmap), rect, alpha, color, matrix, options,
blend_type);
}
bool CFX_SkiaDeviceDriver::ContinueDIBits(CFX_ImageRenderer* handle,
PauseIndicatorIface* pPause) {
return false;
}
void CFX_DIBitmap::UnPreMultiply() {
if (m_nFormat == Format::kUnPreMultiplied || GetBPP() != 32) {
return;
}
void* buffer = GetWritableBuffer().data();
if (!buffer) {
return;
}
m_nFormat = Format::kUnPreMultiplied;
int height = GetHeight();
int width = GetWidth();
int row_bytes = GetPitch();
SkImageInfo premultiplied_info =
SkImageInfo::Make(width, height, kN32_SkColorType, kPremul_SkAlphaType);
SkPixmap premultiplied(premultiplied_info, buffer, row_bytes);
SkImageInfo unpremultiplied_info =
SkImageInfo::Make(width, height, kN32_SkColorType, kUnpremul_SkAlphaType);
SkPixmap unpremultiplied(unpremultiplied_info, buffer, row_bytes);
premultiplied.readPixels(unpremultiplied);
}
void CFX_DIBitmap::ForcePreMultiply() {
m_nFormat = Format::kPreMultiplied;
}
bool CFX_DIBitmap::IsPremultiplied() const {
return m_nFormat == Format::kPreMultiplied;
}
bool CFX_SkiaDeviceDriver::DrawBitsWithMask(RetainPtr<const CFX_DIBBase> bitmap,
RetainPtr<const CFX_DIBBase> mask,
float alpha,
const CFX_Matrix& matrix,
BlendMode blend_type) {
DebugValidate(m_pBitmap);
sk_sp<SkImage> skia_source = bitmap->RealizeSkImage();
if (!skia_source) {
return false;
}
DCHECK(mask->IsMaskFormat());
sk_sp<SkImage> skia_mask = mask->RealizeSkImage();
if (!skia_mask) {
return false;
}
DCHECK_EQ(skia_mask->colorType(), kAlpha_8_SkColorType);
{
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
const int src_width = bitmap->GetWidth();
const int src_height = bitmap->GetHeight();
SkMatrix skMatrix;
SetBitmapMatrix(matrix, src_width, src_height, &skMatrix);
m_pCanvas->concat(skMatrix);
SkPaint paint;
SetBitmapPaintForMerge(bitmap->IsMaskFormat(), !m_FillOptions.aliased_path,
alpha, blend_type, &paint);
sk_sp<SkShader> source_shader = skia_source->makeShader(
SkTileMode::kClamp, SkTileMode::kClamp, SkSamplingOptions());
sk_sp<SkShader> mask_shader = skia_mask->makeShader(
SkTileMode::kClamp, SkTileMode::kClamp, SkSamplingOptions());
paint.setShader(SkShaders::Blend(
SkBlendMode::kSrcIn, std::move(mask_shader), std::move(source_shader)));
m_pCanvas->drawRect(
SkRect::MakeWH(SkIntToScalar(src_width), SkIntToScalar(src_height)),
paint);
}
DebugValidate(m_pBitmap);
return true;
}
bool CFX_SkiaDeviceDriver::SetBitsWithMask(RetainPtr<const CFX_DIBBase> bitmap,
RetainPtr<const CFX_DIBBase> mask,
int dest_left,
int dest_top,
float alpha,
BlendMode blend_type) {
if (m_pBitmap->GetBuffer().empty()) {
return true;
}
CFX_Matrix matrix = CFX_RenderDevice::GetFlipMatrix(
bitmap->GetWidth(), bitmap->GetHeight(), dest_left, dest_top);
return DrawBitsWithMask(std::move(bitmap), std::move(mask), alpha, matrix,
blend_type);
}
void CFX_SkiaDeviceDriver::SetGroupKnockout(bool group_knockout) {
m_bGroupKnockout = group_knockout;
}
bool CFX_SkiaDeviceDriver::SyncInternalBitmaps() {
if (!m_pOriginalBitmap) {
return true;
}
int width = m_pOriginalBitmap->GetWidth();
int height = m_pOriginalBitmap->GetHeight();
DCHECK_EQ(width, m_pBitmap->GetWidth());
DCHECK_EQ(height, m_pBitmap->GetHeight());
DCHECK_EQ(FXDIB_Format::kRgb, m_pOriginalBitmap->GetFormat());
m_pOriginalBitmap->TransferBitmap(/*dest_left=*/0, /*dest_top=*/0, width,
height, m_pBitmap, /*src_left=*/0,
/*src_top=*/0);
return true;
}
void CFX_SkiaDeviceDriver::Clear(uint32_t color) {
m_pCanvas->clear(color);
}
bool CFX_SkiaDeviceDriver::StartDIBitsSkia(RetainPtr<const CFX_DIBBase> bitmap,
const FX_RECT& src_rect,
float alpha,
uint32_t color,
const CFX_Matrix& matrix,
const FXDIB_ResampleOptions& options,
BlendMode blend_type) {
DebugValidate(m_pBitmap);
sk_sp<SkImage> skia_source = bitmap->RealizeSkImage();
if (!skia_source) {
return false;
}
{
SkAutoCanvasRestore scoped_save_restore(m_pCanvas, /*doSave=*/true);
const int width = bitmap->GetWidth();
const int height = bitmap->GetHeight();
SkMatrix skMatrix;
SetBitmapMatrix(matrix, width, height, &skMatrix);
m_pCanvas->concat(skMatrix);
SkPaint paint;
SetBitmapPaint(bitmap->IsMaskFormat(), !m_FillOptions.aliased_path, alpha,
color, blend_type, &paint);
bool use_interpolate_bilinear = options.bInterpolateBilinear;
if (!use_interpolate_bilinear) {
float dest_width = ceilf(matrix.GetXUnit());
float dest_height = ceilf(matrix.GetYUnit());
if (pdfium::IsValueInRangeForNumericType<int>(dest_width) &&
pdfium::IsValueInRangeForNumericType<int>(dest_height)) {
use_interpolate_bilinear = CStretchEngine::UseInterpolateBilinear(
options, static_cast<int>(dest_width),
static_cast<int>(dest_height), width, height);
}
}
SkSamplingOptions sampling_options;
if (use_interpolate_bilinear) {
sampling_options =
SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear);
}
m_pCanvas->drawImageRect(
skia_source,
SkRect::MakeLTRB(src_rect.left, src_rect.top, src_rect.right,
src_rect.bottom),
SkRect::MakeWH(src_rect.Width(), src_rect.Height()), sampling_options,
&paint, SkCanvas::kFast_SrcRectConstraint);
}
DebugValidate(m_pBitmap);
return true;
}
CFX_SkiaDeviceDriver::CharDetail::CharDetail() = default;
CFX_SkiaDeviceDriver::CharDetail::~CharDetail() = default;
bool CFX_DefaultRenderDevice::AttachSkiaImpl(
RetainPtr<CFX_DIBitmap> pBitmap,
bool bRgbByteOrder,
RetainPtr<CFX_DIBitmap> pBackdropBitmap,
bool bGroupKnockout) {
// FPDF_FFLDrawSkia() ends up calling this method with a deliberately null
// `pBitmap`.
if (!pBitmap)
return false;
SetBitmap(pBitmap);
auto driver =
CFX_SkiaDeviceDriver::Create(std::move(pBitmap), bRgbByteOrder,
std::move(pBackdropBitmap), bGroupKnockout);
if (!driver)
return false;
SetDeviceDriver(std::move(driver));
return true;
}
bool CFX_DefaultRenderDevice::AttachCanvas(SkCanvas* canvas) {
auto driver = CFX_SkiaDeviceDriver::Create(canvas);
if (!driver) {
return false;
}
SetDeviceDriver(std::move(driver));
return true;
}
bool CFX_DefaultRenderDevice::CreateSkia(
int width,
int height,
FXDIB_Format format,
RetainPtr<CFX_DIBitmap> pBackdropBitmap) {
auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pBitmap->Create(width, height, format))
return false;
SetBitmap(pBitmap);
auto driver = CFX_SkiaDeviceDriver::Create(std::move(pBitmap), false,
std::move(pBackdropBitmap), false);
if (!driver)
return false;
SetDeviceDriver(std::move(driver));
return true;
}