36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
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// 16 august 2014
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#include "winapi_windows.h"
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#include "_cgo_export.h"
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// TODO rename to images_windows.c?
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HBITMAP toBitmap(void *i, intptr_t dx, intptr_t dy)
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{
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BITMAPINFO bi;
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VOID *ppvBits;
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HBITMAP bitmap;
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ZeroMemory(&bi, sizeof (BITMAPINFO));
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bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
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bi.bmiHeader.biWidth = (LONG) dx;
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bi.bmiHeader.biHeight = -((LONG) dy); // negative height to force top-down drawing;
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bi.bmiHeader.biPlanes = 1;
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bi.bmiHeader.biBitCount = 32;
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bi.bmiHeader.biCompression = BI_RGB;
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bi.bmiHeader.biSizeImage = (DWORD) (dx * dy * 4);
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bitmap = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
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if (bitmap == NULL)
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xpanic("error creating HBITMAP in toBitmap()", GetLastError());
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// image lists use non-premultiplied RGBA - see http://stackoverflow.com/a/25578789/3408572
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// the TRUE here does the conversion
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dotoARGB(i, (void *) ppvBits, TRUE);
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return bitmap;
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}
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void freeBitmap(void *bitmap)
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{
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if (DeleteObject((HBITMAP) bitmap) == 0)
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xpanic("error deleting bitmap in freeBitmap()", GetLastError());
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}
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