| // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "gfx/gdi_util.h" |
| |
| namespace gfx { |
| |
| void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr) { |
| CreateBitmapHeaderWithColorDepth(width, height, 32, hdr); |
| } |
| |
| void CreateBitmapHeaderWithColorDepth(int width, int height, int color_depth, |
| BITMAPINFOHEADER* hdr) { |
| // These values are shared with gfx::PlatformDevice |
| hdr->biSize = sizeof(BITMAPINFOHEADER); |
| hdr->biWidth = width; |
| hdr->biHeight = -height; // minus means top-down bitmap |
| hdr->biPlanes = 1; |
| hdr->biBitCount = color_depth; |
| hdr->biCompression = BI_RGB; // no compression |
| hdr->biSizeImage = 0; |
| hdr->biXPelsPerMeter = 1; |
| hdr->biYPelsPerMeter = 1; |
| hdr->biClrUsed = 0; |
| hdr->biClrImportant = 0; |
| } |
| |
| |
| void CreateBitmapV4Header(int width, int height, BITMAPV4HEADER* hdr) { |
| // Because bmp v4 header is just an extension, we just create a v3 header and |
| // copy the bits over to the v4 header. |
| BITMAPINFOHEADER header_v3; |
| CreateBitmapHeader(width, height, &header_v3); |
| memset(hdr, 0, sizeof(BITMAPV4HEADER)); |
| memcpy(hdr, &header_v3, sizeof(BITMAPINFOHEADER)); |
| |
| // Correct the size of the header and fill in the mask values. |
| hdr->bV4Size = sizeof(BITMAPV4HEADER); |
| hdr->bV4RedMask = 0x00ff0000; |
| hdr->bV4GreenMask = 0x0000ff00; |
| hdr->bV4BlueMask = 0x000000ff; |
| hdr->bV4AlphaMask = 0xff000000; |
| } |
| |
| // Creates a monochrome bitmap header. |
| void CreateMonochromeBitmapHeader(int width, |
| int height, |
| BITMAPINFOHEADER* hdr) { |
| hdr->biSize = sizeof(BITMAPINFOHEADER); |
| hdr->biWidth = width; |
| hdr->biHeight = -height; |
| hdr->biPlanes = 1; |
| hdr->biBitCount = 1; |
| hdr->biCompression = BI_RGB; |
| hdr->biSizeImage = 0; |
| hdr->biXPelsPerMeter = 1; |
| hdr->biYPelsPerMeter = 1; |
| hdr->biClrUsed = 0; |
| hdr->biClrImportant = 0; |
| } |
| |
| void SubtractRectanglesFromRegion(HRGN hrgn, |
| const std::vector<gfx::Rect>& cutouts) { |
| if (cutouts.size()) { |
| HRGN cutout = ::CreateRectRgn(0, 0, 0, 0); |
| for (size_t i = 0; i < cutouts.size(); i++) { |
| ::SetRectRgn(cutout, |
| cutouts[i].x(), |
| cutouts[i].y(), |
| cutouts[i].right(), |
| cutouts[i].bottom()); |
| ::CombineRgn(hrgn, hrgn, cutout, RGN_DIFF); |
| } |
| ::DeleteObject(cutout); |
| } |
| } |
| |
| } // namespace gfx |