cpdf_rendershading.cpp | Explore in Territory

// Copyright 2019 The PDFium Authors
// 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 <math.h>

#include <algorithm>
#include <array>
#include <memory>
#include <utility>
#include <vector>

#include "core/fpdfapi/page/cpdf_colorspace.h"
#include "core/fpdfapi/page/cpdf_dib.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/check.h"
#include "core/fxcrt/check_op.h"
#include "core/fxcrt/compiler_specific.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/numerics/clamped_math.h"
#include "core/fxcrt/span.h"
#include "core/fxcrt/span_util.h"
#include "core/fxcrt/stl_util.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/cfx_fillrenderoptions.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/fx_dib.h"

namespace {

constexpr int kShadingSteps = …;

uint32_t CountOutputsFromFunctions(
    const std::vector<std::unique_ptr<CPDF_Function>>& funcs) { … }

uint32_t GetValidatedOutputsCount(
    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
    const RetainPtr<CPDF_ColorSpace>& pCS) { … }

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) { … }

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) { … }

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) { … }

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) { … }

bool GetScanlineIntersect(int y,
                          const CFX_PointF& first,
                          const CFX_PointF& second,
                          float* x) { … }

void DrawGouraud(const RetainPtr<CFX_DIBitmap>& pBitmap,
                 int alpha,
                 pdfium::span<CPDF_MeshVertex, 3> triangle) { … }

void DrawFreeGouraudShading(
    const RetainPtr<CFX_DIBitmap>& pBitmap,
    const CFX_Matrix& mtObject2Bitmap,
    RetainPtr<const CPDF_Stream> pShadingStream,
    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
    RetainPtr<CPDF_ColorSpace> pCS,
    int alpha) { … }

void DrawLatticeGouraudShading(
    const RetainPtr<CFX_DIBitmap>& pBitmap,
    const CFX_Matrix& mtObject2Bitmap,
    RetainPtr<const CPDF_Stream> pShadingStream,
    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
    RetainPtr<CPDF_ColorSpace> pCS,
    int alpha) { … }

struct CoonBezierCoeff { … };

struct CoonBezier { … };

int Interpolate(int p1, int p2, int delta1, int delta2, bool* overflow) { … }

int BiInterpolImpl(int c0,
                   int c1,
                   int c2,
                   int c3,
                   int x,
                   int y,
                   int x_scale,
                   int y_scale,
                   bool* overflow) { … }

struct CoonColor { … };

struct PatchDrawer { … };

void DrawCoonPatchMeshes(
    ShadingType type,
    const RetainPtr<CFX_DIBitmap>& pBitmap,
    const CFX_Matrix& mtObject2Bitmap,
    RetainPtr<const CPDF_Stream> pShadingStream,
    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
    RetainPtr<CPDF_ColorSpace> pCS,
    bool bNoPathSmooth,
    int alpha) { … }

}  // 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) { … }
chromium/third_party/pdfium/core/fpdfapi/render/cpdf_rendershading.cpp
