Update to xserver 1.16.1.

Tested by naddy@, jsg@ & kettenis@

1 files changed, 1689 insertions, 0 deletions

diff --git a/xserver/glamor/glamor_pixmap.c b/xserver/glamor/glamor_pixmap.c
new file mode 100644
index 000000000..789d3772e
--- /dev/null
+++ b/xserver/glamor/glamor_pixmap.c
@@ -0,0 +1,1689 @@
+/*
+ * 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_make_current(fbo->glamor_priv);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo->fb);
+    glViewport(x0, y0, width, height);
+}
+
+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(ScreenPtr screen, unsigned char alu)
+{
+    glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
+
+    if (glamor_priv->gl_flavor == GLAMOR_GL_ES2) {
+        if (alu != GXcopy)
+            return FALSE;
+        else
+            return TRUE;
+    }
+
+    if (alu == GXcopy) {
+        glDisable(GL_COLOR_LOGIC_OP);
+        return TRUE;
+    }
+    glEnable(GL_COLOR_LOGIC_OP);
+    switch (alu) {
+    case GXclear:
+        glLogicOp(GL_CLEAR);
+        break;
+    case GXand:
+        glLogicOp(GL_AND);
+        break;
+    case GXandReverse:
+        glLogicOp(GL_AND_REVERSE);
+        break;
+    case GXandInverted:
+        glLogicOp(GL_AND_INVERTED);
+        break;
+    case GXnoop:
+        glLogicOp(GL_NOOP);
+        break;
+    case GXxor:
+        glLogicOp(GL_XOR);
+        break;
+    case GXor:
+        glLogicOp(GL_OR);
+        break;
+    case GXnor:
+        glLogicOp(GL_NOR);
+        break;
+    case GXequiv:
+        glLogicOp(GL_EQUIV);
+        break;
+    case GXinvert:
+        glLogicOp(GL_INVERT);
+        break;
+    case GXorReverse:
+        glLogicOp(GL_OR_REVERSE);
+        break;
+    case GXcopyInverted:
+        glLogicOp(GL_COPY_INVERTED);
+        break;
+    case GXorInverted:
+        glLogicOp(GL_OR_INVERTED);
+        break;
+    case GXnand:
+        glLogicOp(GL_NAND);
+        break;
+    case GXset:
+        glLogicOp(GL_SET);
+        break;
+    default:
+        glamor_fallback("unsupported alu %x\n", alu);
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+/*
+ * Map picture's format to the correct gl texture format and type.
+ * no_alpha is used to indicate whehter we need to wire alpha to 1.
+ *
+ * Although opengl support A1/GL_BITMAP, we still don't use it
+ * here, it seems that mesa has bugs when uploading a A1 bitmap.
+ *
+ * Return 0 if find a matched texture type. Otherwise return -1.
+ **/
+static int
+glamor_get_tex_format_type_from_pictformat_gl(PictFormatShort format,
+                                              GLenum *tex_format,
+                                              GLenum *tex_type,
+                                              int *no_alpha,
+                                              int *revert,
+                                              int *swap_rb, int is_upload)
+{
+    *no_alpha = 0;
+    *revert = REVERT_NONE;
+    *swap_rb = is_upload ? SWAP_NONE_UPLOADING : SWAP_NONE_DOWNLOADING;
+    switch (format) {
+    case PICT_a1:
+        *tex_format = GL_ALPHA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        *revert = is_upload ? REVERT_UPLOADING_A1 : REVERT_DOWNLOADING_A1;
+        break;
+    case PICT_b8g8r8x8:
+        *no_alpha = 1;
+    case PICT_b8g8r8a8:
+        *tex_format = GL_BGRA;
+        *tex_type = GL_UNSIGNED_INT_8_8_8_8;
+        break;
+
+    case PICT_x8r8g8b8:
+        *no_alpha = 1;
+    case PICT_a8r8g8b8:
+        *tex_format = GL_BGRA;
+        *tex_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+        break;
+    case PICT_x8b8g8r8:
+        *no_alpha = 1;
+    case PICT_a8b8g8r8:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+        break;
+    case PICT_x2r10g10b10:
+        *no_alpha = 1;
+    case PICT_a2r10g10b10:
+        *tex_format = GL_BGRA;
+        *tex_type = GL_UNSIGNED_INT_2_10_10_10_REV;
+        break;
+    case PICT_x2b10g10r10:
+        *no_alpha = 1;
+    case PICT_a2b10g10r10:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_INT_2_10_10_10_REV;
+        break;
+
+    case PICT_r5g6b5:
+        *tex_format = GL_RGB;
+        *tex_type = GL_UNSIGNED_SHORT_5_6_5;
+        break;
+    case PICT_b5g6r5:
+        *tex_format = GL_RGB;
+        *tex_type = GL_UNSIGNED_SHORT_5_6_5_REV;
+        break;
+    case PICT_x1b5g5r5:
+        *no_alpha = 1;
+    case PICT_a1b5g5r5:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
+        break;
+
+    case PICT_x1r5g5b5:
+        *no_alpha = 1;
+    case PICT_a1r5g5b5:
+        *tex_format = GL_BGRA;
+        *tex_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
+        break;
+    case PICT_a8:
+        *tex_format = GL_ALPHA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        break;
+    case PICT_x4r4g4b4:
+        *no_alpha = 1;
+    case PICT_a4r4g4b4:
+        *tex_format = GL_BGRA;
+        *tex_type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
+        break;
+
+    case PICT_x4b4g4r4:
+        *no_alpha = 1;
+    case PICT_a4b4g4r4:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
+        break;
+
+    default:
+        return -1;
+    }
+    return 0;
+}
+
+#define IS_LITTLE_ENDIAN  (IMAGE_BYTE_ORDER == LSBFirst)
+
+static int
+glamor_get_tex_format_type_from_pictformat_gles2(PictFormatShort format,
+                                                 GLenum *tex_format,
+                                                 GLenum *tex_type,
+                                                 int *no_alpha,
+                                                 int *revert,
+                                                 int *swap_rb, int is_upload)
+{
+    int need_swap_rb = 0;
+
+    *no_alpha = 0;
+    *revert = IS_LITTLE_ENDIAN ? REVERT_NONE : REVERT_NORMAL;
+
+    switch (format) {
+    case PICT_b8g8r8x8:
+        *no_alpha = 1;
+    case PICT_b8g8r8a8:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        need_swap_rb = 1;
+        *revert = IS_LITTLE_ENDIAN ? REVERT_NORMAL : REVERT_NONE;
+        break;
+
+    case PICT_x8r8g8b8:
+        *no_alpha = 1;
+    case PICT_a8r8g8b8:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        need_swap_rb = 1;
+        break;
+
+    case PICT_x8b8g8r8:
+        *no_alpha = 1;
+    case PICT_a8b8g8r8:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        break;
+
+    case PICT_x2r10g10b10:
+        *no_alpha = 1;
+    case PICT_a2r10g10b10:
+        *tex_format = GL_RGBA;
+        /* glReadPixmap doesn't support GL_UNSIGNED_INT_10_10_10_2.
+         * we have to use GL_UNSIGNED_BYTE and do the conversion in
+         * shader latter.*/
+        *tex_type = GL_UNSIGNED_BYTE;
+        if (is_upload == 1) {
+            if (!IS_LITTLE_ENDIAN)
+                *revert = REVERT_UPLOADING_10_10_10_2;
+            else
+                *revert = REVERT_UPLOADING_2_10_10_10;
+        }
+        else {
+            if (!IS_LITTLE_ENDIAN) {
+                *revert = REVERT_DOWNLOADING_10_10_10_2;
+            }
+            else {
+                *revert = REVERT_DOWNLOADING_2_10_10_10;
+            }
+        }
+        need_swap_rb = 1;
+
+        break;
+
+    case PICT_x2b10g10r10:
+        *no_alpha = 1;
+    case PICT_a2b10g10r10:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        if (is_upload == 1) {
+            if (!IS_LITTLE_ENDIAN)
+                *revert = REVERT_UPLOADING_10_10_10_2;
+            else
+                *revert = REVERT_UPLOADING_2_10_10_10;
+        }
+        else {
+            if (!IS_LITTLE_ENDIAN) {
+                *revert = REVERT_DOWNLOADING_10_10_10_2;
+            }
+            else {
+                *revert = REVERT_DOWNLOADING_2_10_10_10;
+            }
+        }
+        break;
+
+    case PICT_r5g6b5:
+        *tex_format = GL_RGB;
+        *tex_type = GL_UNSIGNED_SHORT_5_6_5;
+        *revert = IS_LITTLE_ENDIAN ? REVERT_NONE : REVERT_NORMAL;
+
+        break;
+
+    case PICT_b5g6r5:
+        *tex_format = GL_RGB;
+        *tex_type = GL_UNSIGNED_SHORT_5_6_5;
+        need_swap_rb = IS_LITTLE_ENDIAN ? 1 : 0;;
+        break;
+
+    case PICT_x1b5g5r5:
+        *no_alpha = 1;
+    case PICT_a1b5g5r5:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_SHORT_5_5_5_1;
+        if (IS_LITTLE_ENDIAN) {
+            *revert =
+                is_upload ? REVERT_UPLOADING_1_5_5_5 :
+                REVERT_DOWNLOADING_1_5_5_5;
+        }
+        else
+            *revert = REVERT_NONE;
+        break;
+
+    case PICT_x1r5g5b5:
+        *no_alpha = 1;
+    case PICT_a1r5g5b5:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_SHORT_5_5_5_1;
+        if (IS_LITTLE_ENDIAN) {
+            *revert =
+                is_upload ? REVERT_UPLOADING_1_5_5_5 :
+                REVERT_DOWNLOADING_1_5_5_5;
+        }
+        else
+            *revert = REVERT_NONE;
+        need_swap_rb = 1;
+        break;
+
+    case PICT_a1:
+        *tex_format = GL_ALPHA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        *revert = is_upload ? REVERT_UPLOADING_A1 : REVERT_DOWNLOADING_A1;
+        break;
+
+    case PICT_a8:
+        *tex_format = GL_ALPHA;
+        *tex_type = GL_UNSIGNED_BYTE;
+        *revert = REVERT_NONE;
+        break;
+
+    case PICT_x4r4g4b4:
+        *no_alpha = 1;
+    case PICT_a4r4g4b4:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_SHORT_4_4_4_4;
+        *revert = IS_LITTLE_ENDIAN ? REVERT_NORMAL : REVERT_NONE;
+        need_swap_rb = 1;
+        break;
+
+    case PICT_x4b4g4r4:
+        *no_alpha = 1;
+    case PICT_a4b4g4r4:
+        *tex_format = GL_RGBA;
+        *tex_type = GL_UNSIGNED_SHORT_4_4_4_4;
+        *revert = IS_LITTLE_ENDIAN ? REVERT_NORMAL : REVERT_NONE;
+        break;
+
+    default:
+        LogMessageVerb(X_INFO, 0,
+                       "fail to get matched format for %x \n", format);
+        return -1;
+    }
+
+    if (need_swap_rb)
+        *swap_rb = is_upload ? SWAP_UPLOADING : SWAP_DOWNLOADING;
+    else
+        *swap_rb = is_upload ? SWAP_NONE_UPLOADING : SWAP_NONE_DOWNLOADING;
+    return 0;
+}
+
+static int
+glamor_get_tex_format_type_from_pixmap(PixmapPtr pixmap,
+                                       GLenum *format,
+                                       GLenum *type,
+                                       int *no_alpha,
+                                       int *revert, int *swap_rb, int is_upload)
+{
+    glamor_pixmap_private *pixmap_priv;
+    PictFormatShort pict_format;
+    glamor_screen_private *glamor_priv =
+        glamor_get_screen_private(pixmap->drawable.pScreen);
+
+    pixmap_priv = glamor_get_pixmap_private(pixmap);
+    if (GLAMOR_PIXMAP_PRIV_IS_PICTURE(pixmap_priv))
+        pict_format = pixmap_priv->base.picture->format;
+    else
+        pict_format = format_for_depth(pixmap->drawable.depth);
+
+    if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP) {
+        return glamor_get_tex_format_type_from_pictformat_gl(pict_format,
+                                                             format, type,
+                                                             no_alpha,
+                                                             revert,
+                                                             swap_rb,
+                                                             is_upload);
+    } else {
+        return glamor_get_tex_format_type_from_pictformat_gles2(pict_format,
+                                                                format, type,
+                                                                no_alpha,
+                                                                revert,
+                                                                swap_rb,
+                                                                is_upload);
+    }
+}
+
+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)			\
+	do {								\
+		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)); \
+	} while (0)
+
+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.
+ **/
+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);
+    int non_sub = 0;
+    unsigned int iformat = 0;
+
+    glamor_make_current(glamor_priv);
+    if (*tex == 0) {
+        glGenTextures(1, tex);
+        if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP)
+            iformat = gl_iformat_for_pixmap(pixmap);
+        else
+            iformat = format;
+        non_sub = 1;
+        assert(x == 0 && y == 0);
+    }
+
+    glBindTexture(GL_TEXTURE_2D, *tex);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+
+    assert(pbo || bits != 0);
+    if (bits == NULL) {
+        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
+        glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
+    }
+    if (non_sub)
+        glTexImage2D(GL_TEXTURE_2D, 0, iformat, w, h, 0, format, type, bits);
+    else
+        glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, w, h, format, type, bits);
+
+    if (bits == NULL)
+        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
+}
+
+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);
+    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. */
+    glamor_make_current(glamor_priv);
+    glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_FLOAT,
+                          GL_FALSE, 2 * sizeof(float), vertices);
+    glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
+    glVertexAttribPointer(GLAMOR_VERTEX_SOURCE, 2, GL_FLOAT,
+                          GL_FALSE, 2 * sizeof(float), ptexcoords);
+    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);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, tex);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glUseProgram(glamor_priv->finish_access_prog[no_alpha]);
+    glUniform1i(glamor_priv->finish_access_revert[no_alpha], revert);
+    glUniform1i(glamor_priv->finish_access_swap_rb[no_alpha], swap_rb);
+
+    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+    glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
+    glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+    glDeleteTextures(1, &tex);
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+    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 != GLAMOR_FBO_UNATTACHED)
+        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)
+        iformat = gl_iformat_for_pixmap(pixmap);
+    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 FALSE;
+    }
+    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->large.block_w,
+                                                   pixmap_priv->large.block_h,
+                                                   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;
+    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;
+
+    glamor_make_current(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);
+
+    glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_FLOAT, GL_FALSE,
+                          2 * sizeof(float), vertices);
+    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);
+
+    glVertexAttribPointer(GLAMOR_VERTEX_SOURCE, 2, GL_FLOAT, GL_FALSE,
+                          2 * sizeof(float), texcoords);
+    glEnableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, source_priv->base.fbo->tex);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+    glamor_set_destination_pixmap_fbo(temp_fbo, 0, 0, w, h);
+    glUseProgram(glamor_priv->finish_access_prog[no_alpha]);
+    glUniform1i(glamor_priv->finish_access_revert[no_alpha], revert);
+    glUniform1i(glamor_priv->finish_access_swap_rb[no_alpha], swap_rb);
+
+    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+    glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
+    glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
+    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_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_RW:
+        gl_access = GL_READ_WRITE;
+        gl_usage = GL_DYNAMIC_DRAW;
+        break;
+    default:
+        ErrorF("Glamor: Invalid access code. %d\n", access);
+        assert(0);
+    }
+
+    glamor_make_current(glamor_priv);
+    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;
+    }
+
+    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);
+            glPixelStorei(GL_PACK_INVERT_MESA, 1);
+        }
+
+        if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP && data == NULL) {
+            assert(pbo > 0);
+            glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);
+            glBufferData(GL_PIXEL_PACK_BUFFER, stride * h, NULL, gl_usage);
+        }
+
+        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);
+            glPixelStorei(GL_PACK_INVERT_MESA, 0);
+        }
+        if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP && bits == NULL) {
+            bits = glMapBuffer(GL_PIXEL_PACK_BUFFER, gl_access);
+            glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+        }
+    }
+    else {
+        unsigned int temp_pbo;
+        int yy;
+
+        glamor_make_current(glamor_priv);
+        glGenBuffers(1, &temp_pbo);
+        glBindBuffer(GL_PIXEL_PACK_BUFFER, temp_pbo);
+        glBufferData(GL_PIXEL_PACK_BUFFER, stride * h, NULL, GL_STREAM_READ);
+        glReadPixels(x + fbo_x_off, y + fbo_y_off, w, h, format, type, 0);
+        read = 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);
+        glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
+        glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+        glDeleteBuffers(1, &temp_pbo);
+    }
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+    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->large.block_w,
+                                                   pixmap_priv->large.block_h,
+                                                   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);
+    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 (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 {
+        glamor_make_current(glamor_priv);
+        if (pixmap_priv->base.fbo->pbo == 0)
+            glGenBuffers(1, &pixmap_priv->base.fbo->pbo);
+        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_EXACT_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;
+
+    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);
+}