| // Copyright 2016 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/fpdf_page/cpdf_meshstream.h" |
| |
| #include "core/fpdfapi/fpdf_page/include/cpdf_colorspace.h" |
| #include "core/fpdfapi/fpdf_page/pageint.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h" |
| |
| FX_BOOL CPDF_MeshStream::Load(CPDF_Stream* pShadingStream, |
| CPDF_Function** pFuncs, |
| int nFuncs, |
| CPDF_ColorSpace* pCS) { |
| m_Stream.LoadAllData(pShadingStream); |
| m_BitStream.Init(m_Stream.GetData(), m_Stream.GetSize()); |
| m_pFuncs = pFuncs; |
| m_nFuncs = nFuncs; |
| m_pCS = pCS; |
| CPDF_Dictionary* pDict = pShadingStream->GetDict(); |
| m_nCoordBits = pDict->GetIntegerBy("BitsPerCoordinate"); |
| m_nCompBits = pDict->GetIntegerBy("BitsPerComponent"); |
| m_nFlagBits = pDict->GetIntegerBy("BitsPerFlag"); |
| if (!m_nCoordBits || !m_nCompBits) |
| return FALSE; |
| |
| uint32_t nComps = pCS->CountComponents(); |
| if (nComps > 8) |
| return FALSE; |
| |
| m_nComps = nFuncs ? 1 : nComps; |
| if (((int)m_nComps < 0) || m_nComps > 8) |
| return FALSE; |
| |
| m_CoordMax = m_nCoordBits == 32 ? -1 : (1 << m_nCoordBits) - 1; |
| m_CompMax = (1 << m_nCompBits) - 1; |
| CPDF_Array* pDecode = pDict->GetArrayBy("Decode"); |
| if (!pDecode || pDecode->GetCount() != 4 + m_nComps * 2) |
| return FALSE; |
| |
| m_xmin = pDecode->GetNumberAt(0); |
| m_xmax = pDecode->GetNumberAt(1); |
| m_ymin = pDecode->GetNumberAt(2); |
| m_ymax = pDecode->GetNumberAt(3); |
| for (uint32_t i = 0; i < m_nComps; i++) { |
| m_ColorMin[i] = pDecode->GetNumberAt(i * 2 + 4); |
| m_ColorMax[i] = pDecode->GetNumberAt(i * 2 + 5); |
| } |
| return TRUE; |
| } |
| |
| uint32_t CPDF_MeshStream::GetFlag() { |
| return m_BitStream.GetBits(m_nFlagBits) & 0x03; |
| } |
| |
| void CPDF_MeshStream::GetCoords(FX_FLOAT& x, FX_FLOAT& y) { |
| if (m_nCoordBits == 32) { |
| x = m_xmin + (FX_FLOAT)(m_BitStream.GetBits(m_nCoordBits) * |
| (m_xmax - m_xmin) / (double)m_CoordMax); |
| y = m_ymin + (FX_FLOAT)(m_BitStream.GetBits(m_nCoordBits) * |
| (m_ymax - m_ymin) / (double)m_CoordMax); |
| } else { |
| x = m_xmin + |
| m_BitStream.GetBits(m_nCoordBits) * (m_xmax - m_xmin) / m_CoordMax; |
| y = m_ymin + |
| m_BitStream.GetBits(m_nCoordBits) * (m_ymax - m_ymin) / m_CoordMax; |
| } |
| } |
| |
| void CPDF_MeshStream::GetColor(FX_FLOAT& r, FX_FLOAT& g, FX_FLOAT& b) { |
| uint32_t i; |
| FX_FLOAT color_value[8]; |
| for (i = 0; i < m_nComps; i++) { |
| color_value[i] = m_ColorMin[i] + |
| m_BitStream.GetBits(m_nCompBits) * |
| (m_ColorMax[i] - m_ColorMin[i]) / m_CompMax; |
| } |
| if (m_nFuncs) { |
| static const int kMaxResults = 8; |
| FX_FLOAT result[kMaxResults]; |
| int nResults; |
| FXSYS_memset(result, 0, sizeof(result)); |
| for (uint32_t i = 0; i < m_nFuncs; i++) { |
| if (m_pFuncs[i] && m_pFuncs[i]->CountOutputs() <= kMaxResults) { |
| m_pFuncs[i]->Call(color_value, 1, result, nResults); |
| } |
| } |
| m_pCS->GetRGB(result, r, g, b); |
| } else { |
| m_pCS->GetRGB(color_value, r, g, b); |
| } |
| } |
| |
| uint32_t CPDF_MeshStream::GetVertex(CPDF_MeshVertex& vertex, |
| CFX_Matrix* pObject2Bitmap) { |
| uint32_t flag = GetFlag(); |
| GetCoords(vertex.x, vertex.y); |
| pObject2Bitmap->Transform(vertex.x, vertex.y); |
| GetColor(vertex.r, vertex.g, vertex.b); |
| m_BitStream.ByteAlign(); |
| return flag; |
| } |
| |
| FX_BOOL CPDF_MeshStream::GetVertexRow(CPDF_MeshVertex* vertex, |
| int count, |
| CFX_Matrix* pObject2Bitmap) { |
| for (int i = 0; i < count; i++) { |
| if (m_BitStream.IsEOF()) |
| return FALSE; |
| |
| GetCoords(vertex[i].x, vertex[i].y); |
| pObject2Bitmap->Transform(vertex[i].x, vertex[i].y); |
| GetColor(vertex[i].r, vertex[i].g, vertex[i].b); |
| m_BitStream.ByteAlign(); |
| } |
| return TRUE; |
| } |