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