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/*
Miranda IM: the free IM client for Microsoft* Windows*
Copyright 2010 Miranda IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "..\..\core\commonheaders.h"
typedef DWORD ARGB;
void InitBitmapInfo(BITMAPINFO &bmi, const SIZE &size)
{
ZeroMemory(&bmi, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biWidth = size.cx;
bmi.bmiHeader.biHeight = size.cy;
}
void ConvertToPARGB32(HDC hdc, ARGB *pargb, HBITMAP hbmp, SIZE& sizImage, int cxRow)
{
BITMAPINFO bmi;
InitBitmapInfo(bmi, sizImage);
void *pvBits = malloc(sizImage.cx * 4 * sizImage.cy);
if (GetDIBits(hdc, hbmp, 0, bmi.bmiHeader.biHeight, pvBits, &bmi, DIB_RGB_COLORS) == bmi.bmiHeader.biHeight) {
ULONG cxDelta = cxRow - bmi.bmiHeader.biWidth;
ARGB *pargbMask = (ARGB *)pvBits;
for (ULONG y = bmi.bmiHeader.biHeight + 1; --y;) {
for (ULONG x = bmi.bmiHeader.biWidth + 1; --x;) {
if (*pargbMask++) {
// transparent pixel
*pargb++=0;
}
else {
// opaque pixel
*pargb++ |= 0xFF000000;
}
}
pargb += cxDelta;
}
}
free(pvBits);
}
bool HasAlpha(ARGB *pargb, SIZE& sizImage, int cxRow)
{
ULONG cxDelta = cxRow - sizImage.cx;
for (ULONG y = sizImage.cy; y--;) {
for (ULONG x = sizImage.cx; x--;) {
if (*pargb++ & 0xFF000000)
return true;
}
pargb += cxDelta;
}
return false;
}
void ConvertBufferToPARGB32(HANDLE hPaintBuffer, HDC hdc, HICON hIcon, SIZE& sizIcon)
{
RGBQUAD *prgbQuad;
int cxRow;
HRESULT hr = getBufferedPaintBits(hPaintBuffer, &prgbQuad, &cxRow);
if (SUCCEEDED(hr)) {
ARGB *pargb = (ARGB *)prgbQuad;
if ( !HasAlpha(pargb, sizIcon, cxRow)) {
ICONINFO info;
if (GetIconInfo(hIcon, &info)) {
if (info.hbmMask)
ConvertToPARGB32(hdc, pargb, info.hbmMask, sizIcon, cxRow);
DeleteObject(info.hbmColor);
DeleteObject(info.hbmMask);
}
}
}
}
HBITMAP ConvertIconToBitmap(HICON hicon, HIMAGELIST hIml, int iconId)
{
SIZE sizIcon;
sizIcon.cx = GetSystemMetrics(SM_CXSMICON);
sizIcon.cy = GetSystemMetrics(SM_CYSMICON);
RECT rcIcon = { 0, 0, sizIcon.cx, sizIcon.cy };
HDC hdc = CreateCompatibleDC(NULL);
BITMAPINFO bmi;
InitBitmapInfo(bmi, sizIcon);
HBITMAP hbmp = CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, NULL, NULL, 0);
HBITMAP hbmpOld = (HBITMAP)SelectObject(hdc, hbmp);
BLENDFUNCTION bfAlpha = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
BP_PAINTPARAMS paintParams = {0};
paintParams.cbSize = sizeof(paintParams);
paintParams.dwFlags = BPPF_ERASE;
paintParams.pBlendFunction = &bfAlpha;
HDC hdcBuffer;
HANDLE hPaintBuffer = beginBufferedPaint(hdc, &rcIcon, BPBF_DIB, &paintParams, &hdcBuffer);
if (hPaintBuffer) {
if (hIml)
ImageList_Draw(hIml, iconId, hdc, 0, 0, ILD_TRANSPARENT);
else
DrawIconEx(hdcBuffer, 0, 0, hicon, sizIcon.cx, sizIcon.cy, 0, NULL, DI_NORMAL);
// If icon did not have an alpha channel we need to convert buffer to PARGB
ConvertBufferToPARGB32(hPaintBuffer, hdc, hicon, sizIcon);
// This will write the buffer contents to the destination bitmap
endBufferedPaint(hPaintBuffer, TRUE);
}
SelectObject(hdc, hbmpOld);
DeleteDC(hdc);
return hbmp;
}
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