core/fxge/win32/cfx_psrenderer.h

// 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

#ifndef CORE_FXGE_WIN32_CFX_PSRENDERER_H_
#define CORE_FXGE_WIN32_CFX_PSRENDERER_H_

#include <stddef.h>
#include <stdint.h>

#include <memory>
#include <sstream>
#include <vector>

#include "core/fxcrt/bytestring.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/fx_memory_wrappers.h"
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/cfx_graphstatedata.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/base/span.h"

class CFX_DIBBase;
class CFX_Font;
class CFX_GlyphCache;
class CFX_PSFontTracker;
class CFX_Path;
class TextCharPos;
struct CFX_FillRenderOptions;
struct FXDIB_ResampleOptions;

struct EncoderIface {
  bool (*pA85EncodeFunc)(pdfium::span<const uint8_t> src_buf,
                         std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
                         uint32_t* dest_size);
  void (*pFaxEncodeFunc)(const uint8_t* src_buf,
                         int width,
                         int height,
                         int pitch,
                         std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
                         uint32_t* dest_size);
  bool (*pFlateEncodeFunc)(const uint8_t* src_buf,
                           uint32_t src_size,
                           std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
                           uint32_t* dest_size);
  bool (*pJpegEncodeFunc)(const RetainPtr<CFX_DIBBase>& pSource,
                          uint8_t** dest_buf,
                          size_t* dest_size);
  bool (*pRunLengthEncodeFunc)(
      pdfium::span<const uint8_t> src_buf,
      std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
      uint32_t* dest_size);
};

class CFX_PSRenderer {
 public:
  enum class RenderingLevel {
    kLevel2,
    kLevel3,
    kLevel3Type42,
  };

  CFX_PSRenderer(CFX_PSFontTracker* font_tracker,
                 const EncoderIface* encoder_iface);
  ~CFX_PSRenderer();

  void Init(const RetainPtr<IFX_RetainableWriteStream>& stream,
            RenderingLevel level,
            int width,
            int height);
  void SaveState();
  void RestoreState(bool bKeepSaved);
  void SetClip_PathFill(const CFX_Path* pPath,
                        const CFX_Matrix* pObject2Device,
                        const CFX_FillRenderOptions& fill_options);
  void SetClip_PathStroke(const CFX_Path* pPath,
                          const CFX_Matrix* pObject2Device,
                          const CFX_GraphStateData* pGraphState);
  FX_RECT GetClipBox() { return m_ClipBox; }
  bool DrawPath(const CFX_Path* pPath,
                const CFX_Matrix* pObject2Device,
                const CFX_GraphStateData* pGraphState,
                uint32_t fill_color,
                uint32_t stroke_color,
                const CFX_FillRenderOptions& fill_options);
  bool SetDIBits(const RetainPtr<CFX_DIBBase>& pBitmap,
                 uint32_t color,
                 int dest_left,
                 int dest_top);
  bool StretchDIBits(const RetainPtr<CFX_DIBBase>& pBitmap,
                     uint32_t color,
                     int dest_left,
                     int dest_top,
                     int dest_width,
                     int dest_height,
                     const FXDIB_ResampleOptions& options);
  bool DrawDIBits(const RetainPtr<CFX_DIBBase>& pBitmap,
                  uint32_t color,
                  const CFX_Matrix& matrix,
                  const FXDIB_ResampleOptions& options);
  bool DrawText(int nChars,
                const TextCharPos* pCharPos,
                CFX_Font* pFont,
                const CFX_Matrix& mtObject2Device,
                float font_size,
                uint32_t color);

  static absl::optional<ByteString> GenerateType42SfntDataForTesting(
      const ByteString& psname,
      pdfium::span<const uint8_t> font_data);

  static ByteString GenerateType42FontDictionaryForTesting(
      const ByteString& psname,
      const FX_RECT& bbox,
      size_t num_glyphs,
      size_t glyphs_per_descendant_font);

 private:
  struct Glyph;

  void StartRendering();
  void EndRendering();
  void OutputPath(const CFX_Path* pPath, const CFX_Matrix* pObject2Device);
  void SetGraphState(const CFX_GraphStateData* pGraphState);
  void SetColor(uint32_t color);
  void FindPSFontGlyph(CFX_GlyphCache* pGlyphCache,
                       CFX_Font* pFont,
                       const TextCharPos& charpos,
                       int* ps_fontnum,
                       int* ps_glyphindex);
  void DrawTextAsType3Font(int char_count,
                           const TextCharPos* char_pos,
                           CFX_Font* font,
                           float font_size,
                           std::ostringstream& buf);
  bool DrawTextAsType42Font(int char_count,
                            const TextCharPos* char_pos,
                            CFX_Font* font,
                            float font_size,
                            std::ostringstream& buf);
  bool FaxCompressData(std::unique_ptr<uint8_t, FxFreeDeleter> src_buf,
                       int width,
                       int height,
                       std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
                       uint32_t* dest_size) const;
  void PSCompressData(uint8_t* src_buf,
                      uint32_t src_size,
                      uint8_t** output_buf,
                      uint32_t* output_size,
                      const char** filter) const;
  void WritePreambleString(ByteStringView str);
  void WritePSBinary(pdfium::span<const uint8_t> data);
  void WriteStream(std::ostringstream& stream);
  void WriteString(ByteStringView str);

  bool m_bInited = false;
  bool m_bGraphStateSet = false;
  bool m_bColorSet = false;
  absl::optional<RenderingLevel> m_Level;
  uint32_t m_LastColor = 0;
  FX_RECT m_ClipBox;
  CFX_GraphStateData m_CurGraphState;
  UnownedPtr<CFX_PSFontTracker> const m_pFontTracker;
  UnownedPtr<const EncoderIface> const m_pEncoderIface;
  RetainPtr<IFX_RetainableWriteStream> m_pStream;
  std::vector<std::unique_ptr<Glyph>> m_PSFontList;
  std::ostringstream m_PreambleOutput;
  std::ostringstream m_Output;
  std::vector<FX_RECT> m_ClipBoxStack;
};

#endif  // CORE_FXGE_WIN32_CFX_PSRENDERER_H_