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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 <stddef.h>
#include <algorithm>
#include <memory>
#include "base/logging.h"
#include "skia/ext/skia_utils_win.h"
namespace gfx {
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;
skia::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;
}
float 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;
float x_factor =
static_cast<float>(dc_width) / static_cast<float>(page_width);
float y_factor =
static_cast<float>(dc_height) / static_cast<float>(page_height);
return std::min(x_factor, y_factor);
}
// Apply scaling to the DC.
bool ScaleDC(HDC dc, float 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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