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[gl] Use GL_MESA_pack_invert to flip get_image of windows around.

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This doesn't have any fallback for a GL that fails to implement the
extension.  Fixes 120 testcases for gl-window.
This commit is contained in:
Eric Anholt 2010-01-28 17:39:34 -08:00
parent 11a120fb84
commit 8558cd5790
1 changed files with 4 additions and 0 deletions
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4
src/cairo-gl-surface.c
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@ -759,9 +759,13 @@ _cairo_gl_surface_get_image (cairo_gl_surface_t *surface,
glPixelStorei (GL_PACK_ALIGNMENT, 1);
glPixelStorei (GL_PACK_ROW_LENGTH, image->stride / cpp);
if (surface->fb == 0 && GLEW_MESA_pack_invert)
glPixelStorei (GL_PACK_INVERT_MESA, 1);
glReadPixels (interest->x, interest->y,
interest->width, interest->height,
format, type, image->data);
if (surface->fb == 0 && GLEW_MESA_pack_invert)
glPixelStorei (GL_PACK_INVERT_MESA, 0);
while ((err = glGetError ()))
fprintf (stderr, "GL error 0x%08x\n", (int) err);