xserver randrproto libxtrans fontconfig libxcb xcb-proto mesa git update 26 Jan 2014

xserver          commit c1ce807d9f18f215332d7eeb844e8c640f71c53c
libxcb           commit e7263931aff3e3450dc938ad465a7577f943549f
libxcb/xcb-proto commit d898fd39ad6c82207eb78666b2daad982dd757b5
randrproto       commit a4a6694c059d74247c16527eef4a0ec9f56bbef6
libxtrans        commit e1e6121a1638d43d9929589b4723da2b38cb6b44
fontconfig       commit e2b406053c2937799da8636c56b72a77998bcab0
mesa             commit 07149f0252c52b4ac58b6df4e307fd786b49b490

1 files changed, 1433 insertions, 0 deletions

diff --git a/xorg-server/glamor/glamor_pixmap.c b/xorg-server/glamor/glamor_pixmap.c
new file mode 100644
index 000000000..84694ec3c
--- /dev/null
+++ b/xorg-server/glamor/glamor_pixmap.c
@@ -0,0 +1,1433 @@
+/*
+ * Copyright © 2001 Keith Packard
+ * Copyright © 2008 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *    Zhigang Gong <zhigang.gong@linux.intel.com>
+ *
+ */
+
+#include <stdlib.h>
+
+#include "glamor_priv.h"
+/**
+ * Sets the offsets to add to coordinates to make them address the same bits in
+ * the backing drawable. These coordinates are nonzero only for redirected
+ * windows.
+ */
+void
+glamor_get_drawable_deltas(DrawablePtr drawable, PixmapPtr pixmap,
+			   int *x, int *y)
+{
+#ifdef COMPOSITE
+	if (drawable->type == DRAWABLE_WINDOW) {
+		*x = -pixmap->screen_x;
+		*y = -pixmap->screen_y;
+		return;
+	}
+#endif
+
+	*x = 0;
+	*y = 0;
+}
+
+
+void
+glamor_pixmap_init(ScreenPtr screen)
+{
+
+}
+
+void
+glamor_pixmap_fini(ScreenPtr screen)
+{
+}
+
+void
+glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo * fbo, int x0, int y0, int width, int height)
+{
+	glamor_gl_dispatch *dispatch = glamor_get_dispatch(fbo->glamor_priv);
+	dispatch->glBindFramebuffer(GL_FRAMEBUFFER, fbo->fb);
+#ifndef GLAMOR_GLES2
+	dispatch->glMatrixMode(GL_PROJECTION);
+	dispatch->glLoadIdentity();
+	dispatch->glMatrixMode(GL_MODELVIEW);
+	dispatch->glLoadIdentity();
+#endif
+	dispatch->glViewport(x0, y0,
+			     width, height);
+
+	glamor_put_dispatch(fbo->glamor_priv);
+}
+
+void
+glamor_set_destination_pixmap_priv_nc(glamor_pixmap_private * pixmap_priv)
+{
+	int w,h;
+
+	PIXMAP_PRIV_GET_ACTUAL_SIZE(pixmap_priv, w, h);
+	glamor_set_destination_pixmap_fbo(pixmap_priv->base.fbo, 0, 0,
+					  w, h);
+}
+
+int
+glamor_set_destination_pixmap_priv(glamor_pixmap_private * pixmap_priv)
+{
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+		return -1;
+
+	glamor_set_destination_pixmap_priv_nc(pixmap_priv);
+	return 0;
+}
+
+int
+glamor_set_destination_pixmap(PixmapPtr pixmap)
+{
+	int err;
+	glamor_pixmap_private *pixmap_priv =
+	    glamor_get_pixmap_private(pixmap);
+
+	err = glamor_set_destination_pixmap_priv(pixmap_priv);
+	return err;
+}
+
+Bool
+glamor_set_planemask(PixmapPtr pixmap, unsigned long planemask)
+{
+	if (glamor_pm_is_solid(&pixmap->drawable, planemask)) {
+		return GL_TRUE;
+	}
+
+	glamor_fallback("unsupported planemask %lx\n", planemask);
+	return GL_FALSE;
+}
+
+Bool
+glamor_set_alu(struct glamor_gl_dispatch *dispatch, unsigned char alu)
+{
+#ifndef GLAMOR_GLES2
+	if (alu == GXcopy) {
+		dispatch->glDisable(GL_COLOR_LOGIC_OP);
+		return TRUE;
+	}
+	dispatch->glEnable(GL_COLOR_LOGIC_OP);
+	switch (alu) {
+	case GXclear:
+		dispatch->glLogicOp(GL_CLEAR);
+		break;
+	case GXand:
+		dispatch->glLogicOp(GL_AND);
+		break;
+	case GXandReverse:
+		dispatch->glLogicOp(GL_AND_REVERSE);
+		break;
+	case GXandInverted:
+		dispatch->glLogicOp(GL_AND_INVERTED);
+		break;
+	case GXnoop:
+		dispatch->glLogicOp(GL_NOOP);
+		break;
+	case GXxor:
+		dispatch->glLogicOp(GL_XOR);
+		break;
+	case GXor:
+		dispatch->glLogicOp(GL_OR);
+		break;
+	case GXnor:
+		dispatch->glLogicOp(GL_NOR);
+		break;
+	case GXequiv:
+		dispatch->glLogicOp(GL_EQUIV);
+		break;
+	case GXinvert:
+		dispatch->glLogicOp(GL_INVERT);
+		break;
+	case GXorReverse:
+		dispatch->glLogicOp(GL_OR_REVERSE);
+		break;
+	case GXcopyInverted:
+		dispatch->glLogicOp(GL_COPY_INVERTED);
+		break;
+	case GXorInverted:
+		dispatch->glLogicOp(GL_OR_INVERTED);
+		break;
+	case GXnand:
+		dispatch->glLogicOp(GL_NAND);
+		break;
+	case GXset:
+		dispatch->glLogicOp(GL_SET);
+		break;
+	default:
+		glamor_fallback("unsupported alu %x\n", alu);
+		return FALSE;
+	}
+#else
+	if (alu != GXcopy)
+		return FALSE;
+#endif
+	return TRUE;
+}
+
+static void *
+_glamor_color_convert_a1_a8(void *src_bits, void *dst_bits, int w, int h, int stride, int revert)
+{
+	PictFormatShort dst_format, src_format;
+	pixman_image_t *dst_image;
+	pixman_image_t *src_image;
+	int src_stride;
+
+	if (revert == REVERT_UPLOADING_A1) {
+		src_format = PICT_a1;
+		dst_format = PICT_a8;
+		src_stride = PixmapBytePad(w, 1);
+	} else {
+		dst_format = PICT_a1;
+		src_format = PICT_a8;
+		src_stride = (((w * 8 + 7) / 8) + 3) & ~3;
+	}
+
+	dst_image = pixman_image_create_bits(dst_format,
+					     w, h,
+					     dst_bits,
+					     stride);
+	if (dst_image == NULL) {
+		return NULL;
+	}
+
+	src_image = pixman_image_create_bits(src_format,
+					     w, h,
+					     src_bits,
+					     src_stride);
+
+	if (src_image == NULL) {
+		pixman_image_unref(dst_image);
+		return NULL;
+	}
+
+	pixman_image_composite(PictOpSrc, src_image, NULL, dst_image,
+			       0, 0, 0, 0, 0, 0,
+			       w,h);
+
+	pixman_image_unref(src_image);
+	pixman_image_unref(dst_image);
+	return dst_bits;
+}
+
+#define ADJUST_BITS(d, src_bits, dst_bits)	(((dst_bits) == (src_bits)) ? (d) : 				\
+							(((dst_bits) > (src_bits)) ? 				\
+							  (((d) << ((dst_bits) - (src_bits))) 			\
+								   + (( 1 << ((dst_bits) - (src_bits))) >> 1))	\
+								:  ((d) >> ((src_bits) - (dst_bits)))))
+
+#define GLAMOR_DO_CONVERT(src, dst, no_alpha, swap,		\
+			  a_shift_src, a_bits_src,		\
+			  b_shift_src, b_bits_src,		\
+			  g_shift_src, g_bits_src,		\
+			  r_shift_src, r_bits_src,		\
+			  a_shift, a_bits,			\
+			  b_shift, b_bits,			\
+			  g_shift, g_bits,			\
+			  r_shift, r_bits)			\
+	{								\
+		typeof(src) a,b,g,r;					\
+		typeof(src) a_mask_src, b_mask_src, g_mask_src, r_mask_src;\
+		a_mask_src = (((1 << (a_bits_src)) - 1) << a_shift_src);\
+		b_mask_src = (((1 << (b_bits_src)) - 1) << b_shift_src);\
+		g_mask_src = (((1 << (g_bits_src)) - 1) << g_shift_src);\
+		r_mask_src = (((1 << (r_bits_src)) - 1) << r_shift_src);\
+		if (no_alpha)						\
+			a = (a_mask_src) >> (a_shift_src);			\
+		else							\
+			a = ((src) & (a_mask_src)) >> (a_shift_src);	\
+		b = ((src) & (b_mask_src)) >> (b_shift_src);		\
+		g = ((src) & (g_mask_src)) >> (g_shift_src);		\
+		r = ((src) & (r_mask_src)) >> (r_shift_src);		\
+		a = ADJUST_BITS(a, a_bits_src, a_bits);			\
+		b = ADJUST_BITS(b, b_bits_src, b_bits);			\
+		g = ADJUST_BITS(g, g_bits_src, g_bits);			\
+		r = ADJUST_BITS(r, r_bits_src, r_bits);			\
+		if (swap == 0)						\
+			(*dst) = ((a) << (a_shift)) | ((b) << (b_shift)) | ((g) << (g_shift)) | ((r) << (r_shift)); \
+		else 												    \
+			(*dst) = ((a) << (a_shift)) | ((r) << (b_shift)) | ((g) << (g_shift)) | ((b) << (r_shift)); \
+	}
+
+static void *
+_glamor_color_revert_x2b10g10r10(void *src_bits, void *dst_bits, int w, int h, int stride, int no_alpha, int revert, int swap_rb)
+{
+	int x,y;
+	unsigned int *words, *saved_words, *source_words;
+	int swap = !(swap_rb == SWAP_NONE_DOWNLOADING || swap_rb == SWAP_NONE_UPLOADING);
+
+	source_words = src_bits;
+	words = dst_bits;
+	saved_words = words;
+
+	for (y = 0; y < h; y++)
+	{
+		DEBUGF("Line %d :  ", y);
+		for (x = 0; x < w; x++)
+		{
+			unsigned int pixel = source_words[x];
+
+			if (revert == REVERT_DOWNLOADING_2_10_10_10)
+				GLAMOR_DO_CONVERT(pixel, &words[x], no_alpha, swap,
+						  24, 8, 16, 8, 8, 8, 0, 8,
+						  30, 2, 20, 10, 10, 10, 0, 10)
+			else
+				GLAMOR_DO_CONVERT(pixel, &words[x], no_alpha, swap,
+						  30, 2, 20, 10, 10, 10, 0, 10,
+						  24, 8, 16, 8, 8, 8, 0, 8);
+			DEBUGF("%x:%x ", pixel, words[x]);
+		}
+		DEBUGF("\n");
+		words += stride / sizeof(*words);
+		source_words += stride / sizeof(*words);
+	}
+	DEBUGF("\n");
+	return saved_words;
+
+}
+
+static void *
+_glamor_color_revert_x1b5g5r5(void *src_bits, void *dst_bits, int w, int h, int stride, int no_alpha, int revert, int swap_rb)
+{
+	int x,y;
+	unsigned short *words, *saved_words, *source_words;
+	int swap = !(swap_rb == SWAP_NONE_DOWNLOADING || swap_rb == SWAP_NONE_UPLOADING);
+
+	words = dst_bits;
+	source_words = src_bits;
+	saved_words = words;
+
+	for (y = 0; y < h; y++)
+	{
+		DEBUGF("Line %d :  ", y);
+		for (x = 0; x < w; x++)
+		{
+			unsigned short pixel = source_words[x];
+
+			if (revert == REVERT_DOWNLOADING_1_5_5_5)
+				GLAMOR_DO_CONVERT(pixel, &words[x], no_alpha, swap,
+						  0, 1, 1, 5, 6, 5, 11, 5,
+						  15, 1, 10, 5, 5, 5, 0, 5)
+			else
+				GLAMOR_DO_CONVERT(pixel, &words[x], no_alpha, swap,
+						  15, 1, 10, 5, 5, 5, 0, 5,
+						  0, 1, 1, 5, 6, 5, 11, 5);
+			DEBUGF("%04x:%04x ", pixel, words[x]);
+		}
+		DEBUGF("\n");
+		words += stride / sizeof(*words);
+		source_words += stride / sizeof(*words);
+	}
+	DEBUGF("\n");
+	return saved_words;
+}
+
+/*
+ * This function is to convert an unsupported color format to/from a
+ * supported GL format.
+ * Here are the current scenarios:
+ *
+ * @no_alpha:
+ * 	If it is set, then we need to wire the alpha value to 1.
+ * @revert:
+	REVERT_DOWNLOADING_A1		: convert an Alpha8 buffer to a A1 buffer.
+	REVERT_UPLOADING_A1		: convert an A1 buffer to an Alpha8 buffer
+	REVERT_DOWNLOADING_2_10_10_10 	: convert r10G10b10X2 to X2B10G10R10
+	REVERT_UPLOADING_2_10_10_10 	: convert X2B10G10R10 to R10G10B10X2
+	REVERT_DOWNLOADING_1_5_5_5  	: convert B5G5R5X1 to X1R5G5B5
+	REVERT_UPLOADING_1_5_5_5    	: convert X1R5G5B5 to B5G5R5X1
+   @swap_rb: if we have the swap_rb set, then we need to swap the R and B's position.
+ *
+ */
+
+static void *
+glamor_color_convert_to_bits(void *src_bits, void *dst_bits, int w, int h, int stride, int no_alpha, int revert, int swap_rb)
+{
+	if (revert == REVERT_DOWNLOADING_A1 || revert == REVERT_UPLOADING_A1) {
+		return _glamor_color_convert_a1_a8(src_bits, dst_bits, w, h, stride, revert);
+	} else if (revert == REVERT_DOWNLOADING_2_10_10_10 || revert == REVERT_UPLOADING_2_10_10_10) {
+		return _glamor_color_revert_x2b10g10r10(src_bits, dst_bits, w, h, stride, no_alpha, revert, swap_rb);
+	} else if (revert == REVERT_DOWNLOADING_1_5_5_5 || revert == REVERT_UPLOADING_1_5_5_5) {
+		return _glamor_color_revert_x1b5g5r5(src_bits, dst_bits, w, h, stride, no_alpha, revert, swap_rb);
+	} else
+		ErrorF("convert a non-supported mode %x.\n", revert);
+
+	return NULL;
+}
+
+/**
+ * Upload pixmap to a specified texture.
+ * This texture may not be the one attached to it.
+ **/
+int in_restore = 0;
+static void
+__glamor_upload_pixmap_to_texture(PixmapPtr pixmap, unsigned int *tex,
+				  GLenum format,
+				  GLenum type,
+				  int x, int y, int w, int h,
+				  void *bits, int pbo)
+{
+	glamor_screen_private *glamor_priv =
+	    glamor_get_screen_private(pixmap->drawable.pScreen);
+	glamor_gl_dispatch *dispatch;
+	int non_sub = 0;
+	unsigned int iformat = 0;
+
+	dispatch = glamor_get_dispatch(glamor_priv);
+	if (*tex == 0) {
+		dispatch->glGenTextures(1, tex);
+		if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP)
+			gl_iformat_for_depth(pixmap->drawable.depth, &iformat);
+		else
+			iformat = format;
+		non_sub = 1;
+		assert(x == 0 && y == 0);
+	}
+
+	dispatch->glBindTexture(GL_TEXTURE_2D, *tex);
+	dispatch->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+				  GL_NEAREST);
+	dispatch->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
+				  GL_NEAREST);
+	dispatch->glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+
+	if (bits == NULL)
+		dispatch->glBindBuffer(GL_PIXEL_UNPACK_BUFFER,
+				       pbo);
+	if (non_sub)
+		dispatch->glTexImage2D(GL_TEXTURE_2D,
+				       0, iformat, w, h, 0,
+				       format, type,
+				       bits);
+	else
+		dispatch->glTexSubImage2D(GL_TEXTURE_2D,
+					  0, x, y, w, h,
+					  format, type,
+					  bits);
+
+	if (bits == NULL)
+		dispatch->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
+	glamor_put_dispatch(glamor_priv);
+}
+
+static Bool
+_glamor_upload_bits_to_pixmap_texture(PixmapPtr pixmap, GLenum format, GLenum type,
+				     int no_alpha, int revert,
+				     int swap_rb, int x, int y, int w, int h,
+				     int stride, void* bits, int pbo)
+{
+	glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap);
+	glamor_screen_private *glamor_priv = glamor_get_screen_private(pixmap->drawable.pScreen);
+	glamor_gl_dispatch *dispatch;
+	static float vertices[8];
+	static float texcoords[8] = { 0, 1,
+		1, 1,
+		1, 0,
+		0, 0
+	};
+	static float texcoords_inv[8] = { 0, 0,
+		1, 0,
+		1, 1,
+		0, 1
+	};
+	float *ptexcoords;
+	float dst_xscale, dst_yscale;
+	GLuint tex = 0;
+	int need_flip;
+	int need_free_bits = 0;
+
+	need_flip = !glamor_priv->yInverted;
+
+	if (bits == NULL)
+		goto ready_to_upload;
+
+	if (revert > REVERT_NORMAL) {
+		/* XXX if we are restoring the pixmap, then we may not need to allocate
+		 * new buffer */
+		void *converted_bits;
+
+		if (pixmap->drawable.depth == 1)
+			stride = (((w * 8 + 7) / 8) + 3) & ~3;
+
+		converted_bits = malloc(h * stride);
+
+		if (converted_bits == NULL)
+			return FALSE;
+		bits = glamor_color_convert_to_bits(bits, converted_bits, w, h,
+						    stride,
+						    no_alpha, revert, swap_rb);
+		if (bits == NULL) {
+			ErrorF("Failed to convert pixmap no_alpha %d,"
+				"revert mode %d, swap mode %d\n", no_alpha, revert, swap_rb);
+			return FALSE;
+		}
+		no_alpha = 0;
+		revert = REVERT_NONE;
+		swap_rb = SWAP_NONE_UPLOADING;
+		need_free_bits = TRUE;
+	}
+
+ready_to_upload:
+
+	/* Try fast path firstly, upload the pixmap to the texture attached
+	 * to the fbo directly. */
+	if (no_alpha == 0
+	    && revert == REVERT_NONE
+	    && swap_rb == SWAP_NONE_UPLOADING
+	    && !need_flip
+#ifdef WALKAROUND_LARGE_TEXTURE_MAP
+	    && pixmap_priv->type != GLAMOR_TEXTURE_LARGE
+#endif
+		) {
+		int fbo_x_off, fbo_y_off;
+		assert(pixmap_priv->base.fbo->tex);
+		pixmap_priv_get_fbo_off(pixmap_priv, &fbo_x_off, &fbo_y_off);
+
+		assert(x + fbo_x_off >= 0 && y + fbo_y_off >= 0);
+		assert(x + fbo_x_off + w <= pixmap_priv->base.fbo->width);
+		assert(y + fbo_y_off + h <= pixmap_priv->base.fbo->height);
+		__glamor_upload_pixmap_to_texture(pixmap, &pixmap_priv->base.fbo->tex,
+						  format, type,
+						  x + fbo_x_off, y + fbo_y_off, w, h,
+						  bits, pbo);
+		return TRUE;
+	}
+
+	if (need_flip)
+		ptexcoords = texcoords;
+	else
+		ptexcoords = texcoords_inv;
+
+	pixmap_priv_get_dest_scale(pixmap_priv, &dst_xscale, &dst_yscale);
+	glamor_set_normalize_vcoords(pixmap_priv, dst_xscale,
+				     dst_yscale,
+				     x, y,
+				     x + w, y + h,
+				     glamor_priv->yInverted,
+				     vertices);
+	/* Slow path, we need to flip y or wire alpha to 1. */
+	dispatch = glamor_get_dispatch(glamor_priv);
+	dispatch->glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_FLOAT,
+					GL_FALSE, 2 * sizeof(float),
+					vertices);
+	dispatch->glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
+	dispatch->glVertexAttribPointer(GLAMOR_VERTEX_SOURCE, 2, GL_FLOAT,
+					GL_FALSE, 2 * sizeof(float),
+					ptexcoords);
+	dispatch->glEnableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+
+	glamor_set_destination_pixmap_priv_nc(pixmap_priv);
+	__glamor_upload_pixmap_to_texture(pixmap, &tex,
+					  format, type,
+					  0, 0, w, h,
+					  bits, pbo);
+	dispatch->glActiveTexture(GL_TEXTURE0);
+	dispatch->glBindTexture(GL_TEXTURE_2D, tex);
+
+	dispatch->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+				  GL_NEAREST);
+	dispatch->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
+				  GL_NEAREST);
+#ifndef GLAMOR_GLES2
+	dispatch->glEnable(GL_TEXTURE_2D);
+#endif
+	dispatch->glUseProgram(glamor_priv->finish_access_prog[no_alpha]);
+	dispatch->glUniform1i(glamor_priv->
+			      finish_access_revert[no_alpha],
+			      revert);
+	dispatch->glUniform1i(glamor_priv->finish_access_swap_rb[no_alpha],
+			      swap_rb);
+
+	dispatch->glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+#ifndef GLAMOR_GLES2
+	dispatch->glDisable(GL_TEXTURE_2D);
+#endif
+	dispatch->glUseProgram(0);
+	dispatch->glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
+	dispatch->glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+	dispatch->glDeleteTextures(1, &tex);
+	dispatch->glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+	glamor_put_dispatch(glamor_priv);
+
+	if (need_free_bits)
+		free(bits);
+	return TRUE;
+}
+
+/*
+ * Prepare to upload a pixmap to texture memory.
+ * no_alpha equals 1 means the format needs to wire alpha to 1.
+ * Two condtion need to setup a fbo for a pixmap
+ * 1. !yInverted, we need to do flip if we are not yInverted.
+ * 2. no_alpha != 0, we need to wire the alpha.
+ * */
+static int
+glamor_pixmap_upload_prepare(PixmapPtr pixmap, GLenum format, int no_alpha, int revert, int swap_rb)
+{
+	int flag = 0;
+	glamor_pixmap_private *pixmap_priv;
+	glamor_screen_private *glamor_priv;
+	glamor_pixmap_fbo *fbo;
+	GLenum iformat;
+
+	pixmap_priv = glamor_get_pixmap_private(pixmap);
+	glamor_priv = glamor_get_screen_private(pixmap->drawable.pScreen);
+
+	if (pixmap_priv->base.gl_fbo)
+		return 0;
+
+	if (pixmap_priv->base.fbo
+	     && (pixmap_priv->base.fbo->width < pixmap->drawable.width
+           || pixmap_priv->base.fbo->height < pixmap->drawable.height)) {
+		fbo = glamor_pixmap_detach_fbo(pixmap_priv);
+		glamor_destroy_fbo(fbo);
+        }
+
+	if (pixmap_priv->base.fbo && pixmap_priv->base.fbo->fb)
+		return 0;
+
+	if (!(no_alpha
+	      || (revert == REVERT_NORMAL)
+	      || (swap_rb != SWAP_NONE_UPLOADING)
+	      || !glamor_priv->yInverted)) {
+		/* We don't need a fbo, a simple texture uploading should work. */
+
+		flag = GLAMOR_CREATE_FBO_NO_FBO;
+	}
+
+	if ((flag == GLAMOR_CREATE_FBO_NO_FBO
+		&& pixmap_priv->base.fbo && pixmap_priv->base.fbo->tex)
+	    || (flag == 0
+		&& pixmap_priv->base.fbo && pixmap_priv->base.fbo->fb))
+		return 0;
+
+	if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP)
+		gl_iformat_for_depth(pixmap->drawable.depth, &iformat);
+	else
+		iformat = format;
+
+	if (!glamor_pixmap_ensure_fbo(pixmap, iformat, flag))
+		return -1;
+
+	return 0;
+}
+
+/*
+ * upload sub region to a large region.
+ * */
+static void
+glamor_put_bits(char *dst_bits, int dst_stride, char *src_bits,
+		int src_stride, int bpp,
+		int x, int y, int w, int h)
+{
+	int j;
+	int byte_per_pixel;
+
+	byte_per_pixel = bpp / 8;
+	src_bits += y * src_stride + (x * byte_per_pixel);
+
+	for(j = y; j < y + h; j++)
+	{
+		memcpy(dst_bits, src_bits, w * byte_per_pixel);
+		src_bits += src_stride;
+		dst_bits += dst_stride;
+	}
+}
+/*
+ * download sub region from a large region.
+ */
+static void
+glamor_get_bits(char *dst_bits, int dst_stride, char *src_bits,
+		int src_stride, int bpp,
+		int x, int y, int w, int h)
+{
+	int j;
+	int byte_per_pixel;
+
+	byte_per_pixel = bpp / 8;
+	dst_bits += y * dst_stride + x * byte_per_pixel;
+
+	for(j = y; j < y + h; j++)
+	{
+		memcpy(dst_bits, src_bits, w * byte_per_pixel);
+		src_bits += src_stride;
+		dst_bits += dst_stride;
+	}
+}
+
+
+Bool
+glamor_upload_sub_pixmap_to_texture(PixmapPtr pixmap, int x, int y, int w, int h,
+				    int stride, void *bits, int pbo)
+{
+	GLenum format, type;
+	int no_alpha, revert, swap_rb;
+	glamor_pixmap_private *pixmap_priv;
+	Bool force_clip;
+
+	if (glamor_get_tex_format_type_from_pixmap(pixmap,
+						   &format,
+						   &type,
+						   &no_alpha,
+						   &revert,
+						   &swap_rb, 1)) {
+		glamor_fallback("Unknown pixmap depth %d.\n",
+				pixmap->drawable.depth);
+		return TRUE;
+	}
+	if (glamor_pixmap_upload_prepare(pixmap, format, no_alpha, revert, swap_rb))
+		return FALSE;
+
+	pixmap_priv = glamor_get_pixmap_private(pixmap);
+	force_clip = pixmap_priv->base.glamor_priv->gl_flavor != GLAMOR_GL_DESKTOP
+			&& !glamor_check_fbo_size(pixmap_priv->base.glamor_priv, w, h);
+
+	if (pixmap_priv->type == GLAMOR_TEXTURE_LARGE || force_clip) {
+		RegionRec region;
+		BoxRec box;
+		int n_region;
+		glamor_pixmap_clipped_regions *clipped_regions;
+		void *sub_bits;
+		int i,j;
+
+		sub_bits = malloc(h * stride);
+		if (sub_bits == NULL)
+			return FALSE;
+		box.x1 = x;
+		box.y1 = y;
+		box.x2 = x + w;
+		box.y2 = y + h;
+		RegionInitBoxes(&region, &box, 1);
+		if (!force_clip)
+			clipped_regions = glamor_compute_clipped_regions(pixmap_priv, &region, &n_region, 0, 0, 0);
+		else
+			clipped_regions = glamor_compute_clipped_regions_ext(pixmap_priv, &region, &n_region,
+							pixmap_priv->base.glamor_priv->max_fbo_size,
+							pixmap_priv->base.glamor_priv->max_fbo_size, 0, 0);
+		DEBUGF("prepare upload %dx%d to a large pixmap %p\n", w, h, pixmap);
+		for(i = 0; i < n_region; i++)
+		{
+			BoxPtr boxes;
+			int nbox;
+			int temp_stride;
+			void *temp_bits;
+
+			assert(pbo == 0);
+
+			SET_PIXMAP_FBO_CURRENT(pixmap_priv, clipped_regions[i].block_idx);
+
+			boxes = RegionRects(clipped_regions[i].region);
+			nbox = RegionNumRects(clipped_regions[i].region);
+			DEBUGF("split to %d boxes\n", nbox);
+			for(j = 0; j < nbox; j++)
+			{
+				temp_stride = PixmapBytePad(boxes[j].x2 - boxes[j].x1,
+							    pixmap->drawable.depth);
+
+				if (boxes[j].x1 == x && temp_stride == stride) {
+					temp_bits = (char*)bits + (boxes[j].y1 - y) * stride;
+				} else {
+					temp_bits = sub_bits;
+					glamor_put_bits(temp_bits, temp_stride, bits, stride,
+							pixmap->drawable.bitsPerPixel,
+							boxes[j].x1 - x, boxes[j].y1 - y,
+							boxes[j].x2 - boxes[j].x1,
+							boxes[j].y2 - boxes[j].y1);
+				}
+				DEBUGF("upload x %d y %d w %d h %d temp stride %d \n",
+					boxes[j].x1 - x, boxes[j].y1 - y,
+					boxes[j].x2 - boxes[j].x1,
+					boxes[j].y2 - boxes[j].y1, temp_stride);
+				if (_glamor_upload_bits_to_pixmap_texture(pixmap, format, type, no_alpha,
+									  revert, swap_rb, boxes[j].x1, boxes[j].y1,
+									  boxes[j].x2 - boxes[j].x1,
+									  boxes[j].y2 - boxes[j].y1,
+									  temp_stride, temp_bits, pbo) == FALSE) {
+					RegionUninit(&region);
+					free(sub_bits);
+					assert(0);
+					return FALSE;
+				}
+			}
+			RegionDestroy(clipped_regions[i].region);
+		}
+		free(sub_bits);
+		free(clipped_regions);
+		RegionUninit(&region);
+		return TRUE;
+	} else
+		return _glamor_upload_bits_to_pixmap_texture(pixmap, format, type, no_alpha, revert, swap_rb,
+						     x, y, w, h, stride, bits, pbo);
+}
+
+enum glamor_pixmap_status
+glamor_upload_pixmap_to_texture(PixmapPtr pixmap)
+{
+	glamor_pixmap_private *pixmap_priv;
+	void *data;
+	int pbo;
+	int ret;
+
+	pixmap_priv = glamor_get_pixmap_private(pixmap);
+
+	if ((pixmap_priv->base.fbo)
+	    && (pixmap_priv->base.fbo->pbo_valid)) {
+		data = NULL;
+		pbo = pixmap_priv->base.fbo->pbo;
+	} else {
+		data = pixmap->devPrivate.ptr;
+		pbo = 0;
+	}
+
+	if (glamor_upload_sub_pixmap_to_texture(pixmap, 0, 0,
+						pixmap->drawable.width,
+						pixmap->drawable.height,
+						pixmap->devKind,
+						data, pbo))
+		ret = GLAMOR_UPLOAD_DONE;
+	else
+		ret = GLAMOR_UPLOAD_FAILED;
+
+	return ret;
+}
+
+void
+glamor_restore_pixmap_to_texture(PixmapPtr pixmap)
+{
+	if (glamor_upload_pixmap_to_texture(pixmap) != GLAMOR_UPLOAD_DONE)
+		LogMessage(X_WARNING, "Failed to restore pixmap to texture.\n");
+}
+
+/*
+ * as gles2 only support a very small set of color format and
+ * type when do glReadPixel,
+ * Before we use glReadPixels to get back a textured pixmap,
+ * Use shader to convert it to a supported format and thus
+ * get a new temporary pixmap returned.
+ * */
+
+glamor_pixmap_fbo *
+glamor_es2_pixmap_read_prepare(PixmapPtr source, int x, int y, int w, int h, GLenum format,
+			       GLenum type, int no_alpha, int revert, int swap_rb)
+
+{
+	glamor_pixmap_private *source_priv;
+	glamor_screen_private *glamor_priv;
+	ScreenPtr screen;
+	glamor_pixmap_fbo *temp_fbo;
+	glamor_gl_dispatch *dispatch;
+	float temp_xscale, temp_yscale, source_xscale, source_yscale;
+	static float vertices[8];
+	static float texcoords[8];
+
+	screen = source->drawable.pScreen;
+
+	glamor_priv = glamor_get_screen_private(screen);
+	source_priv = glamor_get_pixmap_private(source);
+	temp_fbo = glamor_create_fbo(glamor_priv,
+				     w, h,
+				     format,
+				     0);
+	if (temp_fbo == NULL)
+		return NULL;
+
+	dispatch = glamor_get_dispatch(glamor_priv);
+	temp_xscale = 1.0 / w;
+	temp_yscale = 1.0 / h;
+
+	glamor_set_normalize_vcoords((struct glamor_pixmap_private*)NULL,temp_xscale,
+				     temp_yscale,
+				     0, 0,
+				     w, h,
+				     glamor_priv->yInverted,
+				     vertices);
+
+	dispatch->glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_FLOAT,
+					GL_FALSE, 2 * sizeof(float),
+					vertices);
+	dispatch->glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
+
+	pixmap_priv_get_scale(source_priv, &source_xscale, &source_yscale);
+	glamor_set_normalize_tcoords(source_priv, source_xscale,
+				     source_yscale,
+				     x, y,
+				     x + w, y + h,
+				     glamor_priv->yInverted,
+				     texcoords);
+
+	dispatch->glVertexAttribPointer(GLAMOR_VERTEX_SOURCE, 2, GL_FLOAT,
+					GL_FALSE, 2 * sizeof(float),
+					texcoords);
+	dispatch->glEnableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+
+	dispatch->glActiveTexture(GL_TEXTURE0);
+	dispatch->glBindTexture(GL_TEXTURE_2D, source_priv->base.fbo->tex);
+	dispatch->glTexParameteri(GL_TEXTURE_2D,
+				  GL_TEXTURE_MIN_FILTER,
+				  GL_NEAREST);
+	dispatch->glTexParameteri(GL_TEXTURE_2D,
+				  GL_TEXTURE_MAG_FILTER,
+				  GL_NEAREST);
+
+	glamor_set_destination_pixmap_fbo(temp_fbo, 0, 0, w, h);
+	dispatch->glUseProgram(glamor_priv->finish_access_prog[no_alpha]);
+	dispatch->glUniform1i(glamor_priv->
+			      finish_access_revert[no_alpha],
+			      revert);
+	dispatch->glUniform1i(glamor_priv->finish_access_swap_rb[no_alpha],
+			      swap_rb);
+
+	dispatch->glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+	dispatch->glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
+	dispatch->glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+	dispatch->glUseProgram(0);
+	glamor_put_dispatch(glamor_priv);
+	return temp_fbo;
+}
+
+/*
+ * Download a sub region of pixmap to a specified memory region.
+ * The pixmap must have a valid FBO, otherwise return a NULL.
+ * */
+
+static void *
+_glamor_download_sub_pixmap_to_cpu(PixmapPtr pixmap, GLenum format,
+				   GLenum type, int no_alpha,
+				   int revert, int swap_rb,
+				   int x, int y, int w, int h,
+				   int stride, void *bits, int pbo, glamor_access_t access)
+{
+	glamor_pixmap_private *pixmap_priv;
+	GLenum gl_access = 0, gl_usage = 0;
+	void *data, *read;
+	glamor_screen_private *glamor_priv =
+	    glamor_get_screen_private(pixmap->drawable.pScreen);
+	glamor_gl_dispatch *dispatch;
+	glamor_pixmap_fbo *temp_fbo = NULL;
+	int need_post_conversion = 0;
+	int need_free_data = 0;
+	int fbo_x_off, fbo_y_off;
+
+	data = bits;
+	pixmap_priv = glamor_get_pixmap_private(pixmap);
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+		return NULL;
+
+	switch (access) {
+	case GLAMOR_ACCESS_RO:
+		gl_access = GL_READ_ONLY;
+		gl_usage = GL_STREAM_READ;
+		break;
+	case GLAMOR_ACCESS_WO:
+		return bits;
+	case GLAMOR_ACCESS_RW:
+		gl_access = GL_READ_WRITE;
+		gl_usage = GL_DYNAMIC_DRAW;
+		break;
+	default:
+		ErrorF("Glamor: Invalid access code. %d\n", access);
+		assert(0);
+	}
+
+	glamor_set_destination_pixmap_priv_nc(pixmap_priv);
+
+	need_post_conversion = (revert > REVERT_NORMAL);
+	if (need_post_conversion) {
+		if (pixmap->drawable.depth == 1) {
+			int temp_stride;
+			temp_stride = (((w * 8 + 7) / 8) + 3) & ~3;
+			data = malloc(temp_stride * h);
+			if (data == NULL)
+				return NULL;
+			need_free_data = 1;
+		}
+	}
+
+	pixmap_priv_get_fbo_off(pixmap_priv, &fbo_x_off, &fbo_y_off);
+
+	if (glamor_priv->gl_flavor == GLAMOR_GL_ES2
+	    && !need_post_conversion
+	    && (swap_rb != SWAP_NONE_DOWNLOADING || revert != REVERT_NONE)) {
+		 if (!(temp_fbo = glamor_es2_pixmap_read_prepare(pixmap, x, y, w, h,
+								 format, type, no_alpha,
+								 revert, swap_rb))) {
+			free(data);
+			return NULL;
+		}
+		x = 0;
+		y = 0;
+		fbo_x_off = 0;
+		fbo_y_off = 0;
+	}
+
+	dispatch = glamor_get_dispatch(glamor_priv);
+	dispatch->glPixelStorei(GL_PACK_ALIGNMENT, 4);
+
+	if (glamor_priv->has_pack_invert || glamor_priv->yInverted) {
+
+		if (!glamor_priv->yInverted) {
+			assert(glamor_priv->gl_flavor ==
+			       GLAMOR_GL_DESKTOP);
+			dispatch->glPixelStorei(GL_PACK_INVERT_MESA, 1);
+		}
+
+		if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP && data == NULL) {
+			assert(pbo > 0);
+			dispatch->glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);
+			dispatch->glBufferData(GL_PIXEL_PACK_BUFFER,
+					       stride *
+					       h,
+					       NULL, gl_usage);
+		}
+
+		dispatch->glReadPixels(x + fbo_x_off, y + fbo_y_off, w, h, format, type, data);
+
+		if (!glamor_priv->yInverted) {
+			assert(glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP);
+			dispatch->glPixelStorei(GL_PACK_INVERT_MESA, 0);
+		}
+		if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP && bits == NULL) {
+			bits = dispatch->glMapBuffer(GL_PIXEL_PACK_BUFFER,
+						     gl_access);
+			dispatch->glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+		}
+	} else {
+		unsigned int temp_pbo;
+		int yy;
+
+		dispatch = glamor_get_dispatch(glamor_priv);
+		dispatch->glGenBuffers(1, &temp_pbo);
+		dispatch->glBindBuffer(GL_PIXEL_PACK_BUFFER,
+				       temp_pbo);
+		dispatch->glBufferData(GL_PIXEL_PACK_BUFFER,
+				       stride *
+				       h,
+				       NULL, GL_STREAM_READ);
+		dispatch->glReadPixels(x + fbo_x_off, y + fbo_y_off, w, h,
+				       format, type, 0);
+		read = dispatch->glMapBuffer(GL_PIXEL_PACK_BUFFER,
+					     GL_READ_ONLY);
+		for (yy = 0; yy < pixmap->drawable.height; yy++)
+			memcpy((char*)data + yy * stride,
+			       (char*)read + (h - yy - 1) * stride, stride);
+		dispatch->glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
+		dispatch->glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+		dispatch->glDeleteBuffers(1, &temp_pbo);
+	}
+
+	dispatch->glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	glamor_put_dispatch(glamor_priv);
+
+	if (need_post_conversion) {
+		/* As OpenGL desktop version never enters here.
+		 * Don't need to consider if the pbo is valid.*/
+		bits = glamor_color_convert_to_bits(data, bits,
+						    w, h,
+						    stride,
+						    no_alpha,
+						    revert, swap_rb);
+	}
+
+	if (temp_fbo != NULL)
+		glamor_destroy_fbo(temp_fbo);
+	if (need_free_data)
+		free(data);
+
+	return bits;
+}
+
+void *
+glamor_download_sub_pixmap_to_cpu(PixmapPtr pixmap, int x, int y, int w, int h,
+				  int stride, void *bits, int pbo, glamor_access_t access)
+{
+	GLenum format, type;
+	int no_alpha, revert, swap_rb;
+	glamor_pixmap_private *pixmap_priv;
+	Bool force_clip;
+
+	if (glamor_get_tex_format_type_from_pixmap(pixmap,
+						   &format,
+						   &type,
+						   &no_alpha,
+						   &revert,
+						   &swap_rb, 0)) {
+		glamor_fallback("Unknown pixmap depth %d.\n",
+				pixmap->drawable.depth);
+		return NULL;
+	}
+
+	pixmap_priv = glamor_get_pixmap_private(pixmap);
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+		return NULL;
+
+	force_clip = pixmap_priv->base.glamor_priv->gl_flavor != GLAMOR_GL_DESKTOP
+			&& !glamor_check_fbo_size(pixmap_priv->base.glamor_priv, w, h);
+
+	if (pixmap_priv->type == GLAMOR_TEXTURE_LARGE || force_clip) {
+
+		RegionRec region;
+		BoxRec box;
+		int n_region;
+		glamor_pixmap_clipped_regions *clipped_regions;
+		void *sub_bits;
+		int i,j;
+
+		sub_bits = malloc(h * stride);
+		if (sub_bits == NULL)
+			return FALSE;
+		box.x1 = x;
+		box.y1 = y;
+		box.x2 = x + w;
+		box.y2 = y + h;
+		RegionInitBoxes(&region, &box, 1);
+
+		if (!force_clip)
+			clipped_regions = glamor_compute_clipped_regions(pixmap_priv, &region, &n_region, 0, 0, 0);
+		else
+			clipped_regions = glamor_compute_clipped_regions_ext(pixmap_priv, &region, &n_region,
+							pixmap_priv->base.glamor_priv->max_fbo_size,
+							pixmap_priv->base.glamor_priv->max_fbo_size, 0, 0);
+
+		DEBUGF("start download large pixmap %p %dx%d \n", pixmap, w, h);
+		for(i = 0; i < n_region; i++)
+		{
+			BoxPtr boxes;
+			int nbox;
+			int temp_stride;
+			void *temp_bits;
+
+			assert(pbo == 0);
+			SET_PIXMAP_FBO_CURRENT(pixmap_priv, clipped_regions[i].block_idx);
+
+			boxes = RegionRects(clipped_regions[i].region);
+			nbox = RegionNumRects(clipped_regions[i].region);
+			for(j = 0; j < nbox; j++)
+			{
+				temp_stride = PixmapBytePad(boxes[j].x2 - boxes[j].x1,
+							    pixmap->drawable.depth);
+
+				if (boxes[j].x1 == x && temp_stride == stride) {
+					temp_bits = (char*)bits + (boxes[j].y1 - y) * stride;
+				} else {
+					temp_bits = sub_bits;
+				}
+				DEBUGF("download x %d y %d w %d h %d temp stride %d \n",
+					boxes[j].x1, boxes[j].y1,
+					boxes[j].x2 - boxes[j].x1,
+					boxes[j].y2 - boxes[j].y1, temp_stride);
+
+				/* For large pixmap, we don't support pbo currently.*/
+				assert(pbo == 0);
+				if (_glamor_download_sub_pixmap_to_cpu(pixmap, format, type, no_alpha,
+								       revert, swap_rb, boxes[j].x1, boxes[j].y1,
+								       boxes[j].x2 - boxes[j].x1,
+								       boxes[j].y2 - boxes[j].y1,
+								       temp_stride, temp_bits, pbo, access) == FALSE) {
+					RegionUninit(&region);
+					free(sub_bits);
+					assert(0);
+					return NULL;
+				}
+				if (boxes[j].x1 != x || temp_stride != stride)
+					glamor_get_bits(bits, stride, temp_bits, temp_stride,
+							pixmap->drawable.bitsPerPixel,
+							boxes[j].x1 - x , boxes[j].y1 - y,
+							boxes[j].x2 - boxes[j].x1,
+							boxes[j].y2 - boxes[j].y1);
+			}
+
+			RegionDestroy(clipped_regions[i].region);
+		}
+		free(sub_bits);
+		free(clipped_regions);
+		RegionUninit(&region);
+		return bits;
+	} else
+	return _glamor_download_sub_pixmap_to_cpu(pixmap, format, type, no_alpha, revert, swap_rb,
+						  x, y, w, h, stride,
+						  bits, pbo, access);
+}
+
+
+/**
+ * Move a pixmap to CPU memory.
+ * The input data is the pixmap's fbo.
+ * The output data is at pixmap->devPrivate.ptr. We always use pbo
+ * to read the fbo and then map it to va. If possible, we will use
+ * it directly as devPrivate.ptr.
+ * If successfully download a fbo to cpu then return TRUE.
+ * Otherwise return FALSE.
+ **/
+Bool
+glamor_download_pixmap_to_cpu(PixmapPtr pixmap, glamor_access_t access)
+{
+	glamor_pixmap_private *pixmap_priv =
+	    glamor_get_pixmap_private(pixmap);
+	unsigned int stride;
+	void *data = NULL, *dst;
+	glamor_screen_private *glamor_priv =
+	    glamor_get_screen_private(pixmap->drawable.pScreen);
+	glamor_gl_dispatch *dispatch;
+	int pbo = 0;
+
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+		return TRUE;
+
+	glamor_debug_output(GLAMOR_DEBUG_TEXTURE_DOWNLOAD,
+			    "Downloading pixmap %p  %dx%d depth%d\n",
+			    pixmap,
+			    pixmap->drawable.width,
+			    pixmap->drawable.height,
+			    pixmap->drawable.depth);
+
+	stride = pixmap->devKind;
+
+	if (access == GLAMOR_ACCESS_WO
+	    || glamor_priv->gl_flavor == GLAMOR_GL_ES2
+	    || (!glamor_priv->has_pack_invert && !glamor_priv->yInverted)
+	    || pixmap_priv->type == GLAMOR_TEXTURE_LARGE) {
+		data = malloc(stride * pixmap->drawable.height);
+	} else {
+		dispatch = glamor_get_dispatch(glamor_priv);
+		if (pixmap_priv->base.fbo->pbo == 0)
+			dispatch->glGenBuffers(1,
+					       &pixmap_priv->base.fbo->pbo);
+		glamor_put_dispatch(glamor_priv);
+		pbo = pixmap_priv->base.fbo->pbo;
+	}
+
+	if (pixmap_priv->type == GLAMOR_TEXTURE_DRM) {
+		stride = PixmapBytePad(pixmap->drawable.width, pixmap->drawable.depth);
+		pixmap_priv->base.drm_stride = pixmap->devKind;
+		pixmap->devKind = stride;
+	}
+
+	dst = glamor_download_sub_pixmap_to_cpu(pixmap, 0, 0,
+						pixmap->drawable.width,
+						pixmap->drawable.height,
+						pixmap->devKind,
+						data, pbo, access);
+
+	if (!dst) {
+		if (data)
+			free(data);
+		return FALSE;
+	}
+
+	if (pbo != 0)
+		pixmap_priv->base.fbo->pbo_valid = 1;
+
+	pixmap_priv->base.gl_fbo = GLAMOR_FBO_DOWNLOADED;
+
+	pixmap->devPrivate.ptr = dst;
+
+	return TRUE;
+}
+
+/* fixup a fbo to the exact size as the pixmap. */
+/* XXX LARGE pixmap? */
+Bool
+glamor_fixup_pixmap_priv(ScreenPtr screen, glamor_pixmap_private *pixmap_priv)
+{
+	glamor_pixmap_fbo *old_fbo;
+	glamor_pixmap_fbo *new_fbo = NULL;
+	PixmapPtr scratch = NULL;
+	glamor_pixmap_private *scratch_priv;
+	DrawablePtr drawable;
+	GCPtr gc = NULL;
+	int ret = FALSE;
+
+	drawable = &pixmap_priv->base.pixmap->drawable;
+
+	if (!GLAMOR_PIXMAP_FBO_NOT_EAXCT_SIZE(pixmap_priv))
+		return	TRUE;
+
+	old_fbo = pixmap_priv->base.fbo;
+
+	if (!old_fbo)
+		return FALSE;
+
+	gc = GetScratchGC(drawable->depth, screen);
+	if (!gc)
+		goto fail;
+
+	scratch = glamor_create_pixmap(screen, drawable->width, drawable->height,
+				       drawable->depth,
+				       GLAMOR_CREATE_PIXMAP_FIXUP);
+
+	scratch_priv = glamor_get_pixmap_private(scratch);
+
+	if (!scratch_priv->base.fbo)
+		goto fail;
+
+	ValidateGC(&scratch->drawable, gc);
+	glamor_copy_area(drawable,
+			 &scratch->drawable,
+			 gc, 0, 0,
+			 drawable->width, drawable->height,
+			 0, 0);
+	old_fbo = glamor_pixmap_detach_fbo(pixmap_priv);
+	new_fbo = glamor_pixmap_detach_fbo(scratch_priv);
+	glamor_pixmap_attach_fbo(pixmap_priv->base.pixmap, new_fbo);
+	glamor_pixmap_attach_fbo(scratch, old_fbo);
+
+	DEBUGF("old %dx%d type %d\n",
+		drawable->width, drawable->height, pixmap_priv->type);
+	DEBUGF("copy tex %d  %dx%d to tex %d %dx%d \n",
+		old_fbo->tex, old_fbo->width, old_fbo->height, new_fbo->tex, new_fbo->width, new_fbo->height);
+	ret = TRUE;
+fail:
+	if (gc)
+		FreeScratchGC(gc);
+	if (scratch)
+		glamor_destroy_pixmap(scratch);
+
+	return ret;
+}
+
+/*
+ * We may use this function to reduce a large pixmap to a small sub
+ * pixmap. Two scenarios currently:
+ * 1. When fallback a large textured pixmap to CPU but we do need to
+ * do rendering within a small sub region, then we can just get a
+ * sub region.
+ *
+ * 2. When uploading a large pixmap to texture but we only need to
+ * use part of the source/mask picture. As glTexImage2D will be more
+ * efficient to upload a contingent region rather than a sub block
+ * in a large buffer. We use this function to gather the sub region
+ * to a contingent sub pixmap.
+ *
+ * The sub-pixmap must have the same format as the source pixmap.
+ *
+ * */
+PixmapPtr
+glamor_get_sub_pixmap(PixmapPtr pixmap, int x, int y, int w, int h, glamor_access_t access)
+{
+	glamor_screen_private *glamor_priv;
+	PixmapPtr sub_pixmap;
+	glamor_pixmap_private *sub_pixmap_priv, *pixmap_priv;
+	void *data;
+	int pbo;
+	int flag;
+	if (x < 0 || y < 0)
+		return NULL;
+	w = (x + w) > pixmap->drawable.width ? (pixmap->drawable.width - x) : w;
+	h = (y + h) > pixmap->drawable.height ? (pixmap->drawable.height - y) : h;
+	if (access == GLAMOR_ACCESS_WO) {
+		sub_pixmap = glamor_create_pixmap(pixmap->drawable.pScreen, w, h,
+						  pixmap->drawable.depth, GLAMOR_CREATE_PIXMAP_CPU);
+		return sub_pixmap;
+	}
+
+	glamor_priv = glamor_get_screen_private(pixmap->drawable.pScreen);
+	pixmap_priv = glamor_get_pixmap_private(pixmap);
+
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+		return NULL;
+	if (glamor_priv->gl_flavor == GLAMOR_GL_ES2 || pixmap_priv->type == GLAMOR_TEXTURE_LARGE)
+		flag = GLAMOR_CREATE_PIXMAP_CPU;
+	else
+		flag = GLAMOR_CREATE_PIXMAP_MAP;
+
+	sub_pixmap = glamor_create_pixmap(pixmap->drawable.pScreen, w, h,
+					  pixmap->drawable.depth, flag);
+
+	if (sub_pixmap == NULL)
+		return NULL;
+
+	sub_pixmap_priv = glamor_get_pixmap_private(sub_pixmap);
+	pbo = sub_pixmap_priv ? (sub_pixmap_priv->base.fbo ? sub_pixmap_priv->base.fbo->pbo : 0): 0;
+
+	if (pixmap_priv->base.is_picture) {
+		sub_pixmap_priv->base.picture = pixmap_priv->base.picture;
+		sub_pixmap_priv->base.is_picture = pixmap_priv->base.is_picture;
+	}
+
+	if (pbo)
+		data = NULL;
+	else
+		data = sub_pixmap->devPrivate.ptr;
+
+	data = glamor_download_sub_pixmap_to_cpu(pixmap, x, y, w, h, sub_pixmap->devKind,
+						 data, pbo, access);
+	if(data == NULL) {
+		fbDestroyPixmap(sub_pixmap);
+		return NULL;
+	}
+	if (pbo) {
+		assert(sub_pixmap->devPrivate.ptr == NULL);
+		sub_pixmap->devPrivate.ptr = data;
+		sub_pixmap_priv->base.fbo->pbo_valid = 1;
+	}
+#if 0
+	struct pixman_box16 box;
+	PixmapPtr new_sub_pixmap;
+	int dx, dy;
+	box.x1 = 0;
+	box.y1 = 0;
+	box.x2 = w;
+	box.y2 = h;
+
+	dx = x;
+	dy = y;
+
+	new_sub_pixmap = glamor_create_pixmap(pixmap->drawable.pScreen, w, h,
+					      pixmap->drawable.depth, GLAMOR_CREATE_PIXMAP_CPU);
+	glamor_copy_n_to_n(&pixmap->drawable, &new_sub_pixmap->drawable, NULL, &box, 1, dx, dy, 0, 0, 0, NULL);
+	glamor_compare_pixmaps(new_sub_pixmap, sub_pixmap, 0, 0, w, h, 1, 1);
+#endif
+
+	return sub_pixmap;
+}
+
+void
+glamor_put_sub_pixmap(PixmapPtr sub_pixmap, PixmapPtr pixmap, int x, int y, int w, int h, glamor_access_t access)
+{
+	void *bits;
+	int pbo;
+	glamor_pixmap_private *sub_pixmap_priv;
+	if (access != GLAMOR_ACCESS_RO) {
+		sub_pixmap_priv = glamor_get_pixmap_private(sub_pixmap);
+		if (sub_pixmap_priv->base.fbo
+		    && sub_pixmap_priv->base.fbo->pbo_valid) {
+			bits = NULL;
+			pbo = sub_pixmap_priv->base.fbo->pbo;
+		} else {
+			bits = sub_pixmap->devPrivate.ptr;
+			pbo = 0;
+		}
+
+		assert(x >= 0 && y >= 0);
+		w = (w > sub_pixmap->drawable.width) ? sub_pixmap->drawable.width : w;
+		h = (h > sub_pixmap->drawable.height) ? sub_pixmap->drawable.height : h;
+		glamor_upload_sub_pixmap_to_texture(pixmap, x, y, w, h, sub_pixmap->devKind, bits, pbo);
+	}
+	glamor_destroy_pixmap(sub_pixmap);
+}