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
15namespace gfx {
16
17// Creates a BITMAPINFOHEADER structure given the bitmap's size.
18GFX_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.
23void 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.
29GFX_EXPORT void CreateBitmapV4Header(int width, int height,
30                                     BITMAPV4HEADER* hdr);
31
32// Creates a monochrome bitmap header.
33void CreateMonochromeBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
34
35// Modify the given hrgn by subtracting the given rectangles.
36GFX_EXPORT void SubtractRectanglesFromRegion(
37    HRGN hrgn,
38    const std::vector<gfx::Rect>& cutouts);
39
40GFX_EXPORT HRGN ConvertPathToHRGN(const gfx::Path& path);
41
42// Calculate scale to fit an entire page on DC.
43GFX_EXPORT double CalculatePageScale(HDC dc, int page_width, int page_height);
44
45// Apply scaling to the DC.
46GFX_EXPORT bool ScaleDC(HDC dc, double scale_factor);
47
48GFX_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_
56