-_mesa_error_check_format_type(struct gl_context *ctx, GLenum format, GLenum type,
- GLboolean drawing);
+_mesa_readpixels_needs_slow_path(const struct gl_context *ctx, GLenum format,
+ GLenum type, GLboolean uses_blit);
+
+extern GLboolean
+_mesa_need_rgb_to_luminance_conversion(GLenum srcBaseFormat,
+ GLenum dstBaseFormat);
+
+extern GLboolean
+_mesa_need_luminance_to_rgb_conversion(GLenum srcBaseFormat,
+ GLenum dstBaseFormat);
+
+extern GLbitfield
+_mesa_get_readpixels_transfer_ops(const struct gl_context *ctx,
+ mesa_format texFormat,
+ GLenum format, GLenum type,
+ GLboolean uses_blit);