くだすれC++Builder（超初心者用）その3

くだすれC++Builder（ ..

855:デフォルトの名無しさん
08/11/30 00:35:28
>>843
Win32スレで聞いているうちにバグの原因がわかったので、
AlphaBlend per Pixelのプログラムを貼っておきます。
void __fastcall TForm1::Button1Click(TObject *Sender)
{
Graphics::TBitmap* bt = new Graphics::TBitmap;
BLENDFUNCTION blend = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
TImage* ti = Image1;
RGBQUAD rgbq;

bt->Width = 256;
bt->Height = 256;
bt->PixelFormat = pf32bit;

int k = 0;
for (int i = 0; i < 255; i++, k++) {
int* sc = reinterpret_cast<int*>(bt->ScanLine[i]);
for (int j = 0; j < 255; j++) {
rgbq.rgbBlue = i;
rgbq.rgbGreen = j;
rgbq.rgbRed = 0;
rgbq.rgbReserved = k;
sc[j] = reinterpret_cast<int&>(rgbq);
}
}
BOOL RESULT =
::AlphaBlend(ti->Canvas->Handle, 0, 0, ti->Width, ti->Height,
bt->Canvas->Handle, 0, 0, bt->Width, bt->Height,
blend);
int err = GetLastError();
const wchar_t* str = WideString().sprintf(L"失敗！%d", err).c_bstr();

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