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 <windows.h>
   9 #include <vector>
  10
  11 #include "ui/gfx/geometry/rect.h"
  12 #include "ui/gfx/gfx_export.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 BITMAPV4HEADER structure given the bitmap's size.  You probably
  22 // only need to use BMP V4 if you need transparency (alpha channel). This
  23 // function sets the AlphaMask to 0xff000000.
  24 GFX_EXPORT void CreateBitmapV4Header(int width, int height,
  25                                      BITMAPV4HEADER* hdr);
  26
  27 // Creates a monochrome bitmap header.
  28 void CreateMonochromeBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
  29
  30 // Modify the given hrgn by subtracting the given rectangles.
  31 GFX_EXPORT void SubtractRectanglesFromRegion(
  32     HRGN hrgn,
  33     const std::vector<gfx::Rect>& cutouts);
  34
  35 GFX_EXPORT HRGN ConvertPathToHRGN(const gfx::Path& path);
  36
  37 // Calculate scale to fit an entire page on DC.
  38 GFX_EXPORT float CalculatePageScale(HDC dc, int page_width, int page_height);
  39
  40 // Apply scaling to the DC.
  41 GFX_EXPORT bool ScaleDC(HDC dc, float scale_factor);
  42
  43 GFX_EXPORT void StretchDIBits(HDC hdc,
  44                               int dest_x, int dest_y, int dest_w, int dest_h,
  45                               int src_x, int src_y, int src_w, int src_h,
  46                               void* pixels, const BITMAPINFO* bitmap_info);
  47
  48 }  // namespace gfx
  49
  50 #endif  // UI_GFX_GDI_UTIL_H_