i965: Disallow PixelTransfer operations for tiled-memcpy TexImage/ReadPixels

The tiled memcpy fast paths perform a simple blit (with only a couple of
trivial pixel conversion routines) and do not accommodate PixelTransfer
operations. Therefore if any are set, fallback to the regular routines.
Note that PixelTransfer only applies to TexImage and ReadPixels, not to
GetTexImage.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jason Ekstrand <jason.ekstrand@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-stable@lists.freedesktop.org

src/mesa/drivers/dri/i965/intel_pixel_read.c

@@ -109,6 +109,10 @@ intel_readpixels_tiled_memcpy(struct gl_context * ctx,
        pack->Invert)
       return false;
 
+   /* Only a simple blit, no scale, bias or other mapping. */
+   if (ctx->_ImageTransferState)
+      return false;
+
    /* This renderbuffer can come from a texture.  In this case, we impose
     * some of the same restrictions we have for textures and adjust for
     * miplevels.

src/mesa/drivers/dri/i965/intel_tex_subimage.c

@@ -118,6 +118,10 @@ intel_texsubimage_tiled_memcpy(struct gl_context * ctx,
        packing->Invert)
       return false;
 
+   /* Only a simple blit, no scale, bias or other mapping. */
+   if (ctx->_ImageTransferState)
+      return false;
+
    if (!intel_get_memcpy(texImage->TexFormat, format, type, &mem_copy, &cpp,
                          INTEL_UPLOAD))
       return false;