ui/gfx/gdi_util.h

   1 // Copyright (c) 2012 The Chromium 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 #ifndef UI_GFX_GDI_UTIL_H_
   6 #define UI_GFX_GDI_UTIL_H_
   7
   8 #include <vector>
   9 #include <windows.h>
  10
  11 #include "ui/gfx/gfx_export.h"
  12 #include "ui/gfx/rect.h"
  13 #include "ui/gfx/path.h"
  14
  15 namespace gfx {
  16
  17 // Creates a BITMAPINFOHEADER structure given the bitmap's size.
  18 GFX_EXPORT void CreateBitmapHeader(int width, int height,
  19                                    BITMAPINFOHEADER* hdr);
  20
  21 // Creates a BITMAPINFOHEADER structure given the bitmap's size and
  22 // color depth in bits per pixel.
  23 void CreateBitmapHeaderWithColorDepth(int width, int height, int color_depth,
  24                                       BITMAPINFOHEADER* hdr);
  25
  26 // Creates a BITMAPV4HEADER structure given the bitmap's size.  You probably
  27 // only need to use BMP V4 if you need transparency (alpha channel). This
  28 // function sets the AlphaMask to 0xff000000.
  29 GFX_EXPORT void CreateBitmapV4Header(int width, int height,
  30                                      BITMAPV4HEADER* hdr);
  31
  32 // Creates a monochrome bitmap header.
  33 void CreateMonochromeBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
  34
  35 // Modify the given hrgn by subtracting the given rectangles.
  36 GFX_EXPORT void SubtractRectanglesFromRegion(
  37     HRGN hrgn,
  38     const std::vector<gfx::Rect>& cutouts);
  39
  40 GFX_EXPORT HRGN ConvertPathToHRGN(const gfx::Path& path);
  41
  42 // Calculate scale to fit an entire page on DC.
  43 GFX_EXPORT double CalculatePageScale(HDC dc, int page_width, int page_height);
  44
  45 // Apply scaling to the DC.
  46 GFX_EXPORT bool ScaleDC(HDC dc, double scale_factor);
  47
  48 GFX_EXPORT void StretchDIBits(HDC hdc,
  49                               int dest_x, int dest_y, int dest_w, int dest_h,
  50                               int src_x, int src_y, int src_w, int src_h,
  51                               void* pixels, const BITMAPINFO* bitmap_info);
  52
  53 }  // namespace gfx
  54
  55 #endif  // UI_GFX_GDI_UTIL_H_