Split fx_dib part 1

Move CFX_DIBSource to its own file. Also move the classes that inherit from it
to their own headers. Their cpp's will be added in followup.

Change-Id: Id2b53e124ea5445c558bfcf627bf526870cc92e8
Reviewed-on: https://pdfium-review.googlesource.com/3450
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 176 insertions, 0 deletions

diff --git a/core/fxge/dib/cfx_dibsource.h b/core/fxge/dib/cfx_dibsource.h
new file mode 100644
index 0000000000..76f7009502
--- /dev/null
+++ b/core/fxge/dib/cfx_dibsource.h
@@ -0,0 +1,176 @@
+// Copyright 2017 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_DIB_CFX_DIBSOURCE_H_
+#define CORE_FXGE_DIB_CFX_DIBSOURCE_H_
+
+#include <memory>
+
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "core/fxcrt/fx_basic.h"
+#include "core/fxcrt/fx_coordinates.h"
+
+enum FXDIB_Channel {
+  FXDIB_Red = 1,
+  FXDIB_Green,
+  FXDIB_Blue,
+  FXDIB_Cyan,
+  FXDIB_Magenta,
+  FXDIB_Yellow,
+  FXDIB_Black,
+  FXDIB_Alpha
+};
+
+enum FXDIB_Format {
+  FXDIB_Invalid = 0,
+  FXDIB_1bppMask = 0x101,
+  FXDIB_1bppRgb = 0x001,
+  FXDIB_1bppCmyk = 0x401,
+  FXDIB_8bppMask = 0x108,
+  FXDIB_8bppRgb = 0x008,
+  FXDIB_8bppRgba = 0x208,
+  FXDIB_8bppCmyk = 0x408,
+  FXDIB_8bppCmyka = 0x608,
+  FXDIB_Rgb = 0x018,
+  FXDIB_Rgba = 0x218,
+  FXDIB_Rgb32 = 0x020,
+  FXDIB_Argb = 0x220,
+  FXDIB_Cmyk = 0x420,
+  FXDIB_Cmyka = 0x620,
+};
+
+#define FXDIB_DOWNSAMPLE 0x04
+#define FXDIB_INTERPOL 0x20
+#define FXDIB_BICUBIC_INTERPOL 0x80
+#define FXDIB_NOSMOOTH 0x100
+#define FXDIB_BLEND_NORMAL 0
+#define FXDIB_BLEND_MULTIPLY 1
+#define FXDIB_BLEND_SCREEN 2
+#define FXDIB_BLEND_OVERLAY 3
+#define FXDIB_BLEND_DARKEN 4
+#define FXDIB_BLEND_LIGHTEN 5
+
+#define FXDIB_BLEND_COLORDODGE 6
+#define FXDIB_BLEND_COLORBURN 7
+#define FXDIB_BLEND_HARDLIGHT 8
+#define FXDIB_BLEND_SOFTLIGHT 9
+#define FXDIB_BLEND_DIFFERENCE 10
+#define FXDIB_BLEND_EXCLUSION 11
+#define FXDIB_BLEND_NONSEPARABLE 21
+#define FXDIB_BLEND_HUE 21
+#define FXDIB_BLEND_SATURATION 22
+#define FXDIB_BLEND_COLOR 23
+#define FXDIB_BLEND_LUMINOSITY 24
+#define FXDIB_BLEND_UNSUPPORTED -1
+
+class CFX_ClipRgn;
+class CFX_DIBitmap;
+
+class CFX_DIBSource : public CFX_Retainable {
+ public:
+  ~CFX_DIBSource() override;
+
+  virtual uint8_t* GetBuffer() const;
+  virtual const uint8_t* GetScanline(int line) const = 0;
+  virtual bool SkipToScanline(int line, IFX_Pause* pPause) const;
+  virtual void DownSampleScanline(int line,
+                                  uint8_t* dest_scan,
+                                  int dest_bpp,
+                                  int dest_width,
+                                  bool bFlipX,
+                                  int clip_left,
+                                  int clip_width) const = 0;
+
+  int GetWidth() const { return m_Width; }
+  int GetHeight() const { return m_Height; }
+
+  FXDIB_Format GetFormat() const {
+    return (FXDIB_Format)(m_AlphaFlag * 0x100 + m_bpp);
+  }
+  uint32_t GetPitch() const { return m_Pitch; }
+  uint32_t* GetPalette() const { return m_pPalette.get(); }
+  int GetBPP() const { return m_bpp; }
+
+  // TODO(thestig): Investigate this. Given the possible values of FXDIB_Format,
+  // it feels as though this should be implemented as !!(m_AlphaFlag & 1) and
+  // IsOpaqueImage() below should never be able to return true.
+  bool IsAlphaMask() const { return m_AlphaFlag == 1; }
+  bool HasAlpha() const { return !!(m_AlphaFlag & 2); }
+  bool IsOpaqueImage() const { return !(m_AlphaFlag & 3); }
+  bool IsCmykImage() const { return !!(m_AlphaFlag & 4); }
+
+  int GetPaletteSize() const {
+    return IsAlphaMask() ? 0 : (m_bpp == 1 ? 2 : (m_bpp == 8 ? 256 : 0));
+  }
+
+  uint32_t GetPaletteEntry(int index) const;
+
+  void SetPaletteEntry(int index, uint32_t color);
+  uint32_t GetPaletteArgb(int index) const { return GetPaletteEntry(index); }
+  void SetPaletteArgb(int index, uint32_t color) {
+    SetPaletteEntry(index, color);
+  }
+
+  // Copies into internally-owned palette.
+  void SetPalette(const uint32_t* pSrcPal);
+
+  CFX_RetainPtr<CFX_DIBitmap> Clone(const FX_RECT* pClip = nullptr) const;
+  CFX_RetainPtr<CFX_DIBitmap> CloneConvert(FXDIB_Format format);
+  CFX_RetainPtr<CFX_DIBitmap> StretchTo(int dest_width,
+                                        int dest_height,
+                                        uint32_t flags = 0,
+                                        const FX_RECT* pClip = nullptr);
+  CFX_RetainPtr<CFX_DIBitmap> TransformTo(const CFX_Matrix* pMatrix,
+                                          int& left,
+                                          int& top,
+                                          uint32_t flags = 0,
+                                          const FX_RECT* pClip = nullptr);
+  CFX_RetainPtr<CFX_DIBitmap> SwapXY(bool bXFlip,
+                                     bool bYFlip,
+                                     const FX_RECT* pClip = nullptr) const;
+  CFX_RetainPtr<CFX_DIBitmap> FlipImage(bool bXFlip, bool bYFlip) const;
+
+  CFX_RetainPtr<CFX_DIBitmap> CloneAlphaMask(
+      const FX_RECT* pClip = nullptr) const;
+
+  // Copies into internally-owned mask.
+  bool SetAlphaMask(const CFX_RetainPtr<CFX_DIBSource>& pAlphaMask,
+                    const FX_RECT* pClip = nullptr);
+
+  void GetOverlapRect(int& dest_left,
+                      int& dest_top,
+                      int& width,
+                      int& height,
+                      int src_width,
+                      int src_height,
+                      int& src_left,
+                      int& src_top,
+                      const CFX_ClipRgn* pClipRgn);
+
+#if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
+  void DebugVerifyBitmapIsPreMultiplied(void* buffer = nullptr) const;
+#endif
+
+  CFX_RetainPtr<CFX_DIBitmap> m_pAlphaMask;
+
+ protected:
+  CFX_DIBSource();
+
+  void BuildPalette();
+  bool BuildAlphaMask();
+  int FindPalette(uint32_t color) const;
+  void GetPalette(uint32_t* pal, int alpha) const;
+
+  int m_Width;
+  int m_Height;
+  int m_bpp;
+  uint32_t m_AlphaFlag;
+  uint32_t m_Pitch;
+  // TODO(weili): Use std::vector for this.
+  std::unique_ptr<uint32_t, FxFreeDeleter> m_pPalette;
+};
+
+#endif  // CORE_FXGE_DIB_CFX_DIBSOURCE_H_