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| 1 // Copyright 2014 PDFium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | |
| 6 | |
| 7 #include "core/fpdfapi/fpdf_page/pageint.h" | |
| 8 | |
| 9 #include <algorithm> | |
| 10 | |
| 11 #include "core/fpdfapi/fpdf_page/cpdf_meshstream.h" | |
| 12 #include "core/fpdfapi/fpdf_page/cpdf_shadingpattern.h" | |
| 13 #include "core/fpdfapi/fpdf_page/include/cpdf_form.h" | |
| 14 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h" | |
| 15 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h" | |
| 16 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h" | |
| 17 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h" | |
| 18 | |
| 19 namespace { | |
| 20 | |
| 21 const int kSingleCoordinatePair = 1; | |
| 22 const int kTensorCoordinatePairs = 16; | |
| 23 const int kCoonsCoordinatePairs = 12; | |
| 24 | |
| 25 const int kSingleColorPerPatch = 1; | |
| 26 const int kQuadColorsPerPatch = 4; | |
| 27 | |
| 28 } // namespace | |
| 29 | |
| 30 | |
| 31 | |
| 32 CFX_FloatRect GetShadingBBox(CPDF_Stream* pStream, | |
| 33 ShadingType type, | |
| 34 const CFX_Matrix* pMatrix, | |
| 35 CPDF_Function** pFuncs, | |
| 36 int nFuncs, | |
| 37 CPDF_ColorSpace* pCS) { | |
| 38 if (!pStream || !pStream->IsStream() || !pFuncs || !pCS) | |
| 39 return CFX_FloatRect(0, 0, 0, 0); | |
| 40 | |
| 41 CPDF_MeshStream stream; | |
| 42 if (!stream.Load(pStream, pFuncs, nFuncs, pCS)) | |
| 43 return CFX_FloatRect(0, 0, 0, 0); | |
| 44 | |
| 45 CFX_FloatRect rect; | |
| 46 bool bStarted = false; | |
| 47 bool bGouraud = type == kFreeFormGouraudTriangleMeshShading || | |
| 48 type == kLatticeFormGouraudTriangleMeshShading; | |
| 49 | |
| 50 int point_count = kSingleCoordinatePair; | |
| 51 if (type == kTensorProductPatchMeshShading) | |
| 52 point_count = kTensorCoordinatePairs; | |
| 53 else if (type == kCoonsPatchMeshShading) | |
| 54 point_count = kCoonsCoordinatePairs; | |
| 55 | |
| 56 int color_count = kSingleColorPerPatch; | |
| 57 if (type == kCoonsPatchMeshShading || type == kTensorProductPatchMeshShading) | |
| 58 color_count = kQuadColorsPerPatch; | |
| 59 | |
| 60 while (!stream.m_BitStream.IsEOF()) { | |
| 61 uint32_t flag = 0; | |
| 62 if (type != kLatticeFormGouraudTriangleMeshShading) | |
| 63 flag = stream.GetFlag(); | |
| 64 | |
| 65 if (!bGouraud && flag) { | |
| 66 point_count -= 4; | |
| 67 color_count -= 2; | |
| 68 } | |
| 69 | |
| 70 for (int i = 0; i < point_count; i++) { | |
| 71 FX_FLOAT x, y; | |
| 72 stream.GetCoords(x, y); | |
| 73 if (bStarted) { | |
| 74 rect.UpdateRect(x, y); | |
| 75 } else { | |
| 76 rect.InitRect(x, y); | |
| 77 bStarted = TRUE; | |
| 78 } | |
| 79 } | |
| 80 stream.m_BitStream.SkipBits(stream.m_nComps * stream.m_nCompBits * | |
| 81 color_count); | |
| 82 if (bGouraud) | |
| 83 stream.m_BitStream.ByteAlign(); | |
| 84 } | |
| 85 rect.Transform(pMatrix); | |
| 86 return rect; | |
| 87 } | |
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Chromium Code Reviews
Issue 1923153002:
CPDF_Document::LoadPattern() and friends always have a valid matrix. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium@clean_doc2