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// Copyright (c) 2012 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 "ui/gfx/gdi_util.h"
#include "base/memory/scoped_ptr.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);
}
}
HRGN ConvertPathToHRGN(const gfx::Path& path) {
#if defined(USE_AURA)
int point_count = path.getPoints(NULL, 0);
scoped_array<SkPoint> points(new SkPoint[point_count]);
path.getPoints(points.get(), point_count);
scoped_array<POINT> windows_points(new POINT[point_count]);
for (int i = 0; i < point_count; ++i) {
windows_points[i].x = SkScalarRound(points[i].fX);
windows_points[i].y = SkScalarRound(points[i].fY);
}
return ::CreatePolygonRgn(windows_points.get(), point_count, ALTERNATE);
#elif defined(OS_WIN)
return path.CreateNativeRegion();
#endif
}
double CalculatePageScale(HDC dc, int page_width, int page_height) {
int dc_width = GetDeviceCaps(dc, HORZRES);
int dc_height = GetDeviceCaps(dc, VERTRES);
// If page fits DC - no scaling needed.
if (dc_width >= page_width && dc_height >= page_height)
return 1.0;
double x_factor =
static_cast<double>(dc_width) / static_cast<double>(page_width);
double y_factor =
static_cast<double>(dc_height) / static_cast<double>(page_height);
return std::min(x_factor, y_factor);
}
// Apply scaling to the DC.
bool ScaleDC(HDC dc, double scale_factor) {
SetGraphicsMode(dc, GM_ADVANCED);
XFORM xform = {0};
xform.eM11 = xform.eM22 = scale_factor;
return !!ModifyWorldTransform(dc, &xform, MWT_LEFTMULTIPLY);
}
} // namespace gfx
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