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
15namespace gfx {
16
17// Creates a BITMAPINFOHEADER structure given the bitmap's size.
18UI_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.
22void 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.
28UI_EXPORT void CreateBitmapV4Header(int width, int height, BITMAPV4HEADER* hdr);
29
30// Creates a monochrome bitmap header.
31void CreateMonochromeBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
32
33// Modify the given hrgn by subtracting the given rectangles.
34UI_EXPORT void SubtractRectanglesFromRegion(
35    HRGN hrgn,
36    const std::vector<gfx::Rect>& cutouts);
37
38UI_EXPORT HRGN ConvertPathToHRGN(const gfx::Path& path);
39
40// Calculate scale to fit an entire page on DC.
41UI_EXPORT double CalculatePageScale(HDC dc, int page_width, int page_height);
42
43// Apply scaling to the DC.
44UI_EXPORT bool ScaleDC(HDC dc, double scale_factor);
45
46UI_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_
54