зеркало из https://github.com/mozilla/gecko-dev.git
98 строки
2.7 KiB
Diff
98 строки
2.7 KiB
Diff
--- ../../../temp/cairo-0.5.0/src/cairo-win32-surface.c 2005-05-12 02:59:13.000000000 +0000
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+++ cairo/src/cairo-win32-surface.c 2005-07-22 15:07:16.713115200 +0000
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@@ -509,12 +509,48 @@ _cairo_win32_surface_release_dest_image
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SRCCOPY))
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_cairo_win32_print_gdi_error ("_cairo_win32_surface_release_dest_image");
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cairo_surface_destroy ((cairo_surface_t *)local);
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}
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+// AlphaBlend is not available or useable on older versions of Win32
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+
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+/* for compatibility with VC++ 5 */
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+#if !defined(AC_SRC_OVER)
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+#define AC_SRC_OVER 0x00
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+#pragma pack(1)
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+typedef struct {
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+ BYTE BlendOp;
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+ BYTE BlendFlags;
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+ BYTE SourceConstantAlpha;
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+ BYTE AlphaFormat;
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+}BLENDFUNCTION;
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+#pragma pack()
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+#endif
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+
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+/* for compatibility with VC++ 6 */
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+#ifndef AC_SRC_ALPHA
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+#define AC_SRC_ALPHA 0x01
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+#endif
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+
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+typedef BOOL (WINAPI *ALPHABLENDPROC)(
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+ HDC hdcDest,
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+ int nXOriginDest,
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+ int nYOriginDest,
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+ int nWidthDest,
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+ int hHeightDest,
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+ HDC hdcSrc,
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+ int nXOriginSrc,
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+ int nYOriginSrc,
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+ int nWidthSrc,
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+ int nHeightSrc,
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+ BLENDFUNCTION blendFunction);
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+
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+static unsigned gAlphaBlendChecked = FALSE;
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+static ALPHABLENDPROC gAlphaBlend;
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+
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static cairo_int_status_t
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_cairo_win32_surface_composite (cairo_operator_t operator,
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cairo_pattern_t *pattern,
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cairo_pattern_t *mask_pattern,
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void *abstract_dst,
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int src_x,
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@@ -530,12 +566,27 @@ _cairo_win32_surface_composite (cairo_op
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cairo_win32_surface_t *src;
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cairo_surface_pattern_t *src_surface_pattern;
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int alpha;
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int integer_transform;
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int itx, ity;
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+ if (!gAlphaBlendChecked) {
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+ OSVERSIONINFO os;
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+
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+ os.dwOSVersionInfoSize = sizeof(os);
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+ GetVersionEx(&os);
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+ // If running on Win98, disable using AlphaBlend()
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+ // to avoid Win98 AlphaBlend() bug
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+ if (VER_PLATFORM_WIN32_WINDOWS != os.dwPlatformId ||
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+ os.dwMajorVersion != 4 || os.dwMinorVersion != 10) {
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+ gAlphaBlend = (ALPHABLENDPROC)GetProcAddress(LoadLibrary("msimg32"),
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+ "AlphaBlend");
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+ }
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+ gAlphaBlendChecked = TRUE;
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+ }
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+
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if (pattern->type != CAIRO_PATTERN_SURFACE ||
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pattern->extend != CAIRO_EXTEND_NONE)
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return CAIRO_INT_STATUS_UNSUPPORTED;
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if (mask_pattern) {
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/* FIXME: When we fully support RENDER style 4-channel
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@@ -584,13 +635,16 @@ _cairo_win32_surface_composite (cairo_op
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blend_function.BlendOp = AC_SRC_OVER;
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blend_function.BlendFlags = 0;
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blend_function.SourceConstantAlpha = alpha;
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blend_function.AlphaFormat = src->format == CAIRO_FORMAT_ARGB32 ? AC_SRC_ALPHA : 0;
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- if (!AlphaBlend (dst->dc,
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+ if (!gAlphaBlend)
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+ return CAIRO_INT_STATUS_UNSUPPORTED;
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+
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+ if (!gAlphaBlend(dst->dc,
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dst_x, dst_y,
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width, height,
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src->dc,
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src_x + itx, src_y + ity,
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width, height,
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blend_function))
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