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mirkobrombin
6db53253f4
Assisted-by: Claude Code:claude-opus-5-5 AI-Scope: StretchDIBits raster operation handling and its test
64 lines
2.6 KiB
C
64 lines
2.6 KiB
C
#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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/* GetObject on bitmaps, whether the runtime or the program answers it: sizes, the BITMAP, a DIB section's DIBSECTION and deleted
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bitmaps. */
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int raven_entry(void)
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{
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HDC screen = CreateCompatibleDC(NULL);
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BITMAPINFO info = {0};
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info.bmiHeader.biSize = sizeof info.bmiHeader;
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info.bmiHeader.biWidth = 30;
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info.bmiHeader.biHeight = -20;
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info.bmiHeader.biPlanes = 1;
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info.bmiHeader.biBitCount = 32;
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void *bits = NULL;
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HBITMAP section = CreateDIBSection(screen, &info, DIB_RGB_COLORS, &bits, NULL, 0);
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HBITMAP plain = CreateCompatibleBitmap(screen, 17, 9);
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if (!screen || !section || !bits || !plain)
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return 1;
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for (int round = 0; round < 3; ++round) {
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BITMAP bitmap;
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if (GetObjectW(plain, 0, NULL) != sizeof bitmap || GetObjectW(plain, sizeof bitmap, &bitmap) != sizeof bitmap ||
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bitmap.bmWidth != 17 || bitmap.bmHeight != 9 || bitmap.bmPlanes != 1 || bitmap.bmBits)
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return 2;
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if (GetObjectW(section, sizeof bitmap, &bitmap) != sizeof bitmap || bitmap.bmWidth != 30 || bitmap.bmHeight != 20 ||
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bitmap.bmBitsPixel != 32 || bitmap.bmWidthBytes != 120 || bitmap.bmBits != bits)
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return 3;
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if (GetObjectA(section, sizeof bitmap, &bitmap) != sizeof bitmap || bitmap.bmBits != bits)
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return 4;
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if (GetObjectW(section, 31, &bitmap) != 0)
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return 5;
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DIBSECTION full;
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if (GetObjectW(section, sizeof full, &full) != sizeof full || full.dsBmih.biWidth != 30 || full.dsBm.bmBits != bits)
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return 6;
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}
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/* An image stretched with SRCPAINT adds to the pixels, alpha included, and does not replace them. */
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HGDIOBJ previous = SelectObject(screen, section);
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DWORD *pixels = bits;
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for (int index = 0; index < 600; ++index)
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pixels[index] = 0x00102030;
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static const DWORD opaque = 0xff000000;
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BITMAPINFO one = info;
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one.bmiHeader.biWidth = 1;
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one.bmiHeader.biHeight = 1;
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if (StretchDIBits(screen, 0, 0, 30, 20, 0, 0, 1, 1, &opaque, &one, DIB_RGB_COLORS, SRCPAINT) != 20)
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return 9;
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for (int index = 0; index < 600; ++index)
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if (pixels[index] != 0xff102030)
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return 10;
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/* SRCAND with black leaves nothing, SRCCOPY still replaces. */
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static const DWORD blue = 0x000000ff;
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if (StretchDIBits(screen, 0, 0, 30, 20, 0, 0, 1, 1, &blue, &one, DIB_RGB_COLORS, SRCAND) != 20 || pixels[0] != 0x00000030)
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return 11;
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if (StretchDIBits(screen, 0, 0, 30, 20, 0, 0, 1, 1, &opaque, &one, DIB_RGB_COLORS, SRCCOPY) != 20 || pixels[0] != 0xff000000)
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return 12;
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SelectObject(screen, previous);
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if (!DeleteObject(plain) || GetObjectW(plain, 0, NULL) != 0)
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return 7;
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if (!DeleteObject(section) || !DeleteDC(screen))
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return 8;
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return 0;
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}
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