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/*
* Copyright (C) 2011 Brent Fulgham <bfulgham@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DIBPixelData.h"
namespace WebCore {
static const WORD bitmapType = 0x4d42; // BMP format
static const WORD bitmapPixelsPerMeter = 2834; // 72 dpi
DIBPixelData::DIBPixelData(HBITMAP bitmap)
{
initialize(bitmap);
}
void DIBPixelData::initialize(HBITMAP bitmap)
{
BITMAP bmpInfo;
GetObject(bitmap, sizeof(bmpInfo), &bmpInfo);
m_bitmapBuffer = reinterpret_cast<UInt8*>(bmpInfo.bmBits);
m_bitmapBufferLength = bmpInfo.bmWidthBytes * bmpInfo.bmHeight;
m_size = IntSize(bmpInfo.bmWidth, bmpInfo.bmHeight);
m_bytesPerRow = bmpInfo.bmWidthBytes;
m_bitsPerPixel = bmpInfo.bmBitsPixel;
}
#ifndef NDEBUG
void DIBPixelData::writeToFile(LPCWSTR filePath)
{
HANDLE hFile = ::CreateFile(filePath, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (INVALID_HANDLE_VALUE == hFile)
return;
BITMAPFILEHEADER header;
header.bfType = bitmapType;
header.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
header.bfReserved1 = 0;
header.bfReserved2 = 0;
header.bfSize = sizeof(BITMAPFILEHEADER);
BITMAPINFOHEADER info;
info.biSize = sizeof(BITMAPINFOHEADER);
info.biWidth = m_size.width();
info.biHeight = m_size.height();
info.biPlanes = 1;
info.biBitCount = m_bitsPerPixel;
info.biCompression = BI_RGB;
info.biSizeImage = bufferLength();
info.biXPelsPerMeter = bitmapPixelsPerMeter;
info.biYPelsPerMeter = bitmapPixelsPerMeter;
info.biClrUsed = 0;
info.biClrImportant = 0;
DWORD bytesWritten = 0;
::WriteFile(hFile, &header, sizeof(header), &bytesWritten, 0);
::WriteFile(hFile, &info, sizeof(info), &bytesWritten, 0);
::WriteFile(hFile, buffer(), bufferLength(), &bytesWritten, 0);
::CloseHandle(hFile);
}
#endif
void DIBPixelData::setRGBABitmapAlpha(HDC hdc, const IntRect& dstRect, unsigned char level)
{
HBITMAP bitmap = static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP));
DIBPixelData pixelData(bitmap);
ASSERT(pixelData.bitsPerPixel() == 32);
IntRect drawRect(dstRect);
#if !OS(WINCE)
XFORM trans;
GetWorldTransform(hdc, &trans);
IntSize transformedPosition(trans.eDx, trans.eDy);
drawRect.move(transformedPosition);
#endif
int pixelDataWidth = pixelData.size().width();
int pixelDataHeight = pixelData.size().height();
IntRect bitmapRect(0, 0, pixelDataWidth, pixelDataHeight);
drawRect.intersect(bitmapRect);
if (drawRect.isEmpty())
return;
RGBQUAD* bytes = reinterpret_cast<RGBQUAD*>(pixelData.buffer());
bytes += drawRect.y() * pixelDataWidth;
size_t width = drawRect.width();
size_t height = drawRect.height();
int x = drawRect.x();
for (size_t i = 0; i < height; i++) {
RGBQUAD* p = bytes + x;
for (size_t j = 0; j < width; j++) {
p->rgbReserved = level;
p++;
}
bytes += pixelDataWidth;
}
}
} // namespace WebCore
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