Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1383 insertions, 0 deletions

diff --git a/gfx/cairo/libpixman/src/pixman-bits-image.c b/gfx/cairo/libpixman/src/pixman-bits-image.c
new file mode 100644
index 0000000000..f050f35316
--- /dev/null
+++ b/gfx/cairo/libpixman/src/pixman-bits-image.c
@@ -0,0 +1,1383 @@
+/*
+ * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
+ *             2005 Lars Knoll & Zack Rusin, Trolltech
+ *             2008 Aaron Plattner, NVIDIA Corporation
+ * Copyright © 2000 SuSE, Inc.
+ * Copyright © 2007, 2009 Red Hat, Inc.
+ * Copyright © 2008 André Tupinambá <andrelrt@gmail.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Keith Packard makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "pixman-private.h"
+#include "pixman-combine32.h"
+#include "pixman-inlines.h"
+#include "dither/blue-noise-64x64.h"
+
+/* Fetch functions */
+
+static force_inline void
+fetch_pixel_no_alpha_32 (bits_image_t *image,
+			 int x, int y, pixman_bool_t check_bounds,
+			 void *out)
+{
+    uint32_t *ret = out;
+
+    if (check_bounds &&
+	(x < 0 || x >= image->width || y < 0 || y >= image->height))
+	*ret = 0;
+    else
+	*ret = image->fetch_pixel_32 (image, x, y);
+}
+
+static force_inline void
+fetch_pixel_no_alpha_float (bits_image_t *image,
+			    int x, int y, pixman_bool_t check_bounds,
+			    void *out)
+{
+    argb_t *ret = out;
+
+    if (check_bounds &&
+	(x < 0 || x >= image->width || y < 0 || y >= image->height))
+	ret->a = ret->r = ret->g = ret->b = 0.f;
+    else
+	*ret = image->fetch_pixel_float (image, x, y);
+}
+
+typedef void (* get_pixel_t) (bits_image_t *image,
+			      int x, int y, pixman_bool_t check_bounds, void *out);
+
+static force_inline void
+bits_image_fetch_pixel_nearest (bits_image_t   *image,
+				pixman_fixed_t  x,
+				pixman_fixed_t  y,
+				get_pixel_t	get_pixel,
+				void	       *out)
+{
+    int x0 = pixman_fixed_to_int (x - pixman_fixed_e);
+    int y0 = pixman_fixed_to_int (y - pixman_fixed_e);
+
+    if (image->common.repeat != PIXMAN_REPEAT_NONE)
+    {
+	repeat (image->common.repeat, &x0, image->width);
+	repeat (image->common.repeat, &y0, image->height);
+
+	get_pixel (image, x0, y0, FALSE, out);
+    }
+    else
+    {
+	get_pixel (image, x0, y0, TRUE, out);
+    }
+}
+
+static force_inline void
+bits_image_fetch_pixel_bilinear_32 (bits_image_t   *image,
+				    pixman_fixed_t  x,
+				    pixman_fixed_t  y,
+				    get_pixel_t	    get_pixel,
+				    void	   *out)
+{
+    pixman_repeat_t repeat_mode = image->common.repeat;
+    int width = image->width;
+    int height = image->height;
+    int x1, y1, x2, y2;
+    uint32_t tl, tr, bl, br;
+    int32_t distx, disty;
+    uint32_t *ret = out;
+
+    x1 = x - pixman_fixed_1 / 2;
+    y1 = y - pixman_fixed_1 / 2;
+
+    distx = pixman_fixed_to_bilinear_weight (x1);
+    disty = pixman_fixed_to_bilinear_weight (y1);
+
+    x1 = pixman_fixed_to_int (x1);
+    y1 = pixman_fixed_to_int (y1);
+    x2 = x1 + 1;
+    y2 = y1 + 1;
+
+    if (repeat_mode != PIXMAN_REPEAT_NONE)
+    {
+	repeat (repeat_mode, &x1, width);
+	repeat (repeat_mode, &y1, height);
+	repeat (repeat_mode, &x2, width);
+	repeat (repeat_mode, &y2, height);
+
+	get_pixel (image, x1, y1, FALSE, &tl);
+	get_pixel (image, x2, y1, FALSE, &tr);
+	get_pixel (image, x1, y2, FALSE, &bl);
+	get_pixel (image, x2, y2, FALSE, &br);
+    }
+    else
+    {
+	get_pixel (image, x1, y1, TRUE, &tl);
+	get_pixel (image, x2, y1, TRUE, &tr);
+	get_pixel (image, x1, y2, TRUE, &bl);
+	get_pixel (image, x2, y2, TRUE, &br);
+    }
+
+    *ret = bilinear_interpolation (tl, tr, bl, br, distx, disty);
+}
+
+static force_inline void
+bits_image_fetch_pixel_bilinear_float (bits_image_t   *image,
+				       pixman_fixed_t  x,
+				       pixman_fixed_t  y,
+				       get_pixel_t     get_pixel,
+				       void	      *out)
+{
+    pixman_repeat_t repeat_mode = image->common.repeat;
+    int width = image->width;
+    int height = image->height;
+    int x1, y1, x2, y2;
+    argb_t tl, tr, bl, br;
+    float distx, disty;
+    argb_t *ret = out;
+
+    x1 = x - pixman_fixed_1 / 2;
+    y1 = y - pixman_fixed_1 / 2;
+
+    distx = ((float)pixman_fixed_fraction(x1)) / 65536.f;
+    disty = ((float)pixman_fixed_fraction(y1)) / 65536.f;
+
+    x1 = pixman_fixed_to_int (x1);
+    y1 = pixman_fixed_to_int (y1);
+    x2 = x1 + 1;
+    y2 = y1 + 1;
+
+    if (repeat_mode != PIXMAN_REPEAT_NONE)
+    {
+	repeat (repeat_mode, &x1, width);
+	repeat (repeat_mode, &y1, height);
+	repeat (repeat_mode, &x2, width);
+	repeat (repeat_mode, &y2, height);
+
+	get_pixel (image, x1, y1, FALSE, &tl);
+	get_pixel (image, x2, y1, FALSE, &tr);
+	get_pixel (image, x1, y2, FALSE, &bl);
+	get_pixel (image, x2, y2, FALSE, &br);
+    }
+    else
+    {
+	get_pixel (image, x1, y1, TRUE, &tl);
+	get_pixel (image, x2, y1, TRUE, &tr);
+	get_pixel (image, x1, y2, TRUE, &bl);
+	get_pixel (image, x2, y2, TRUE, &br);
+    }
+
+    *ret = bilinear_interpolation_float (tl, tr, bl, br, distx, disty);
+}
+
+static force_inline void accum_32(unsigned int *satot, unsigned int *srtot,
+				  unsigned int *sgtot, unsigned int *sbtot,
+				  const void *p, pixman_fixed_t f)
+{
+    uint32_t pixel = *(uint32_t *)p;
+
+    *srtot += (int)RED_8 (pixel) * f;
+    *sgtot += (int)GREEN_8 (pixel) * f;
+    *sbtot += (int)BLUE_8 (pixel) * f;
+    *satot += (int)ALPHA_8 (pixel) * f;
+}
+
+static force_inline void reduce_32(unsigned int satot, unsigned int srtot,
+				   unsigned int sgtot, unsigned int sbtot,
+                                   void *p)
+{
+    uint32_t *ret = p;
+
+    satot = (satot + 0x8000) >> 16;
+    srtot = (srtot + 0x8000) >> 16;
+    sgtot = (sgtot + 0x8000) >> 16;
+    sbtot = (sbtot + 0x8000) >> 16;
+
+    satot = CLIP (satot, 0, 0xff);
+    srtot = CLIP (srtot, 0, 0xff);
+    sgtot = CLIP (sgtot, 0, 0xff);
+    sbtot = CLIP (sbtot, 0, 0xff);
+
+    *ret = ((satot << 24) | (srtot << 16) | (sgtot <<  8) | (sbtot));
+}
+
+static force_inline void accum_float(unsigned int *satot, unsigned int *srtot,
+				     unsigned int *sgtot, unsigned int *sbtot,
+				     const void *p, pixman_fixed_t f)
+{
+    const argb_t *pixel = p;
+
+    *satot += pixel->a * f;
+    *srtot += pixel->r * f;
+    *sgtot += pixel->g * f;
+    *sbtot += pixel->b * f;
+}
+
+static force_inline void reduce_float(unsigned int satot, unsigned int srtot,
+				      unsigned int sgtot, unsigned int sbtot,
+				      void *p)
+{
+    argb_t *ret = p;
+
+    ret->a = CLIP (satot / 65536.f, 0.f, 1.f);
+    ret->r = CLIP (srtot / 65536.f, 0.f, 1.f);
+    ret->g = CLIP (sgtot / 65536.f, 0.f, 1.f);
+    ret->b = CLIP (sbtot / 65536.f, 0.f, 1.f);
+}
+
+typedef void (* accumulate_pixel_t) (unsigned int *satot, unsigned int *srtot,
+				     unsigned int *sgtot, unsigned int *sbtot,
+				     const void *pixel, pixman_fixed_t f);
+
+typedef void (* reduce_pixel_t) (unsigned int satot, unsigned int srtot,
+				 unsigned int sgtot, unsigned int sbtot,
+                                 void *out);
+
+static force_inline void
+bits_image_fetch_pixel_convolution (bits_image_t   *image,
+				    pixman_fixed_t  x,
+				    pixman_fixed_t  y,
+				    get_pixel_t     get_pixel,
+				    void	      *out,
+				    accumulate_pixel_t accum,
+				    reduce_pixel_t reduce)
+{
+    pixman_fixed_t *params = image->common.filter_params;
+    int x_off = (params[0] - pixman_fixed_1) >> 1;
+    int y_off = (params[1] - pixman_fixed_1) >> 1;
+    int32_t cwidth = pixman_fixed_to_int (params[0]);
+    int32_t cheight = pixman_fixed_to_int (params[1]);
+    int32_t i, j, x1, x2, y1, y2;
+    pixman_repeat_t repeat_mode = image->common.repeat;
+    int width = image->width;
+    int height = image->height;
+    unsigned int srtot, sgtot, sbtot, satot;
+
+    params += 2;
+
+    x1 = pixman_fixed_to_int (x - pixman_fixed_e - x_off);
+    y1 = pixman_fixed_to_int (y - pixman_fixed_e - y_off);
+    x2 = x1 + cwidth;
+    y2 = y1 + cheight;
+
+    srtot = sgtot = sbtot = satot = 0;
+
+    for (i = y1; i < y2; ++i)
+    {
+	for (j = x1; j < x2; ++j)
+	{
+	    int rx = j;
+	    int ry = i;
+
+	    pixman_fixed_t f = *params;
+
+	    if (f)
+	    {
+		/* Must be big enough to hold a argb_t */
+		argb_t pixel;
+
+		if (repeat_mode != PIXMAN_REPEAT_NONE)
+		{
+		    repeat (repeat_mode, &rx, width);
+		    repeat (repeat_mode, &ry, height);
+
+		    get_pixel (image, rx, ry, FALSE, &pixel);
+		}
+		else
+		{
+		    get_pixel (image, rx, ry, TRUE, &pixel);
+		}
+
+		accum (&satot, &srtot, &sgtot, &sbtot, &pixel, f);
+	    }
+
+	    params++;
+	}
+    }
+
+    reduce (satot, srtot, sgtot, sbtot, out);
+}
+
+static void
+bits_image_fetch_pixel_separable_convolution (bits_image_t  *image,
+					      pixman_fixed_t x,
+					      pixman_fixed_t y,
+					      get_pixel_t    get_pixel,
+					      void	    *out,
+					      accumulate_pixel_t accum,
+					      reduce_pixel_t     reduce)
+{
+    pixman_fixed_t *params = image->common.filter_params;
+    pixman_repeat_t repeat_mode = image->common.repeat;
+    int width = image->width;
+    int height = image->height;
+    int cwidth = pixman_fixed_to_int (params[0]);
+    int cheight = pixman_fixed_to_int (params[1]);
+    int x_phase_bits = pixman_fixed_to_int (params[2]);
+    int y_phase_bits = pixman_fixed_to_int (params[3]);
+    int x_phase_shift = 16 - x_phase_bits;
+    int y_phase_shift = 16 - y_phase_bits;
+    int x_off = ((cwidth << 16) - pixman_fixed_1) >> 1;
+    int y_off = ((cheight << 16) - pixman_fixed_1) >> 1;
+    pixman_fixed_t *y_params;
+    unsigned int srtot, sgtot, sbtot, satot;
+    int32_t x1, x2, y1, y2;
+    int32_t px, py;
+    int i, j;
+
+    /* Round x and y to the middle of the closest phase before continuing. This
+     * ensures that the convolution matrix is aligned right, since it was
+     * positioned relative to a particular phase (and not relative to whatever
+     * exact fraction we happen to get here).
+     */
+    x = ((x >> x_phase_shift) << x_phase_shift) + ((1 << x_phase_shift) >> 1);
+    y = ((y >> y_phase_shift) << y_phase_shift) + ((1 << y_phase_shift) >> 1);
+
+    px = (x & 0xffff) >> x_phase_shift;
+    py = (y & 0xffff) >> y_phase_shift;
+
+    y_params = params + 4 + (1 << x_phase_bits) * cwidth + py * cheight;
+
+    x1 = pixman_fixed_to_int (x - pixman_fixed_e - x_off);
+    y1 = pixman_fixed_to_int (y - pixman_fixed_e - y_off);
+    x2 = x1 + cwidth;
+    y2 = y1 + cheight;
+
+    srtot = sgtot = sbtot = satot = 0;
+
+    for (i = y1; i < y2; ++i)
+    {
+        pixman_fixed_48_16_t fy = *y_params++;
+        pixman_fixed_t *x_params = params + 4 + px * cwidth;
+
+        if (fy)
+        {
+            for (j = x1; j < x2; ++j)
+            {
+                pixman_fixed_t fx = *x_params++;
+		int rx = j;
+		int ry = i;
+
+                if (fx)
+                {
+                    /* Must be big enough to hold a argb_t */
+                    argb_t pixel;
+                    pixman_fixed_t f;
+
+                    if (repeat_mode != PIXMAN_REPEAT_NONE)
+                    {
+                        repeat (repeat_mode, &rx, width);
+                        repeat (repeat_mode, &ry, height);
+
+                        get_pixel (image, rx, ry, FALSE, &pixel);
+                    }
+                    else
+                    {
+                        get_pixel (image, rx, ry, TRUE, &pixel);
+		    }
+
+                    f = (fy * fx + 0x8000) >> 16;
+
+		    accum(&satot, &srtot, &sgtot, &sbtot, &pixel, f);
+                }
+            }
+	}
+    }
+
+
+    reduce(satot, srtot, sgtot, sbtot, out);
+}
+
+static force_inline void
+bits_image_fetch_pixel_filtered (bits_image_t  *image,
+				 pixman_bool_t  wide,
+				 pixman_fixed_t x,
+				 pixman_fixed_t y,
+				 get_pixel_t    get_pixel,
+				 void          *out)
+{
+    switch (image->common.filter)
+    {
+    case PIXMAN_FILTER_NEAREST:
+    case PIXMAN_FILTER_FAST:
+	bits_image_fetch_pixel_nearest (image, x, y, get_pixel, out);
+	break;
+
+    case PIXMAN_FILTER_BILINEAR:
+    case PIXMAN_FILTER_GOOD:
+    case PIXMAN_FILTER_BEST:
+	if (wide)
+	    bits_image_fetch_pixel_bilinear_float (image, x, y, get_pixel, out);
+	else
+	    bits_image_fetch_pixel_bilinear_32 (image, x, y, get_pixel, out);
+	break;
+
+    case PIXMAN_FILTER_CONVOLUTION:
+	if (wide)
+	{
+	    bits_image_fetch_pixel_convolution (image, x, y,
+						get_pixel, out,
+						accum_float,
+						reduce_float);
+	}
+	else
+	{
+	    bits_image_fetch_pixel_convolution (image, x, y,
+						get_pixel, out,
+						accum_32, reduce_32);
+	}
+	break;
+
+    case PIXMAN_FILTER_SEPARABLE_CONVOLUTION:
+	if (wide)
+	{
+	    bits_image_fetch_pixel_separable_convolution (image, x, y,
+							  get_pixel, out,
+							  accum_float,
+							  reduce_float);
+	}
+	else
+	{
+	    bits_image_fetch_pixel_separable_convolution (image, x, y,
+							  get_pixel, out,
+							  accum_32, reduce_32);
+	}
+        break;
+
+    default:
+	assert (0);
+        break;
+    }
+}
+
+static uint32_t *
+__bits_image_fetch_affine_no_alpha (pixman_iter_t *  iter,
+				    pixman_bool_t    wide,
+				    const uint32_t * mask)
+{
+    pixman_image_t *image  = iter->image;
+    int             offset = iter->x;
+    int             line   = iter->y++;
+    int             width  = iter->width;
+    uint32_t *      buffer = iter->buffer;
+
+    const uint32_t wide_zero[4] = {0};
+    pixman_fixed_t x, y;
+    pixman_fixed_t ux, uy;
+    pixman_vector_t v;
+    int i;
+    get_pixel_t get_pixel =
+	wide ? fetch_pixel_no_alpha_float : fetch_pixel_no_alpha_32;
+
+    /* reference point is the center of the pixel */
+    v.vector[0] = pixman_int_to_fixed (offset) + pixman_fixed_1 / 2;
+    v.vector[1] = pixman_int_to_fixed (line) + pixman_fixed_1 / 2;
+    v.vector[2] = pixman_fixed_1;
+
+    if (image->common.transform)
+    {
+	if (!pixman_transform_point_3d (image->common.transform, &v))
+	    return iter->buffer;
+
+	ux = image->common.transform->matrix[0][0];
+	uy = image->common.transform->matrix[1][0];
+    }
+    else
+    {
+	ux = pixman_fixed_1;
+	uy = 0;
+    }
+
+    x = v.vector[0];
+    y = v.vector[1];
+
+    for (i = 0; i < width; ++i)
+    {
+	if (!mask || (!wide && mask[i]) ||
+	    (wide && memcmp(&mask[4 * i], wide_zero, 16) != 0))
+	{
+	    bits_image_fetch_pixel_filtered (
+		&image->bits, wide, x, y, get_pixel, buffer);
+	}
+
+	x += ux;
+	y += uy;
+	buffer += wide ? 4 : 1;
+    }
+
+    return iter->buffer;
+}
+
+static uint32_t *
+bits_image_fetch_affine_no_alpha_32 (pixman_iter_t  *iter,
+				     const uint32_t *mask)
+{
+    return __bits_image_fetch_affine_no_alpha(iter, FALSE, mask);
+}
+
+static uint32_t *
+bits_image_fetch_affine_no_alpha_float (pixman_iter_t  *iter,
+					const uint32_t *mask)
+{
+    return __bits_image_fetch_affine_no_alpha(iter, TRUE, mask);
+}
+
+/* General fetcher */
+static force_inline void
+fetch_pixel_general_32 (bits_image_t *image,
+			int x, int y, pixman_bool_t check_bounds,
+			void *out)
+{
+    uint32_t pixel, *ret = out;
+
+    if (check_bounds &&
+	(x < 0 || x >= image->width || y < 0 || y >= image->height))
+    {
+	*ret = 0;
+	return;
+    }
+
+    pixel = image->fetch_pixel_32 (image, x, y);
+
+    if (image->common.alpha_map)
+    {
+	uint32_t pixel_a;
+
+	x -= image->common.alpha_origin_x;
+	y -= image->common.alpha_origin_y;
+
+	if (x < 0 || x >= image->common.alpha_map->width ||
+	    y < 0 || y >= image->common.alpha_map->height)
+	{
+	    pixel_a = 0;
+	}
+	else
+	{
+	    pixel_a = image->common.alpha_map->fetch_pixel_32 (
+		image->common.alpha_map, x, y);
+
+	    pixel_a = ALPHA_8 (pixel_a);
+	}
+
+	pixel &= 0x00ffffff;
+	pixel |= (pixel_a << 24);
+    }
+
+    *ret = pixel;
+}
+
+static force_inline void
+fetch_pixel_general_float (bits_image_t *image,
+			int x, int y, pixman_bool_t check_bounds,
+			void *out)
+{
+    argb_t *ret = out;
+
+    if (check_bounds &&
+	(x < 0 || x >= image->width || y < 0 || y >= image->height))
+    {
+	ret->a = ret->r = ret->g = ret->b = 0;
+	return;
+    }
+
+    *ret = image->fetch_pixel_float (image, x, y);
+
+    if (image->common.alpha_map)
+    {
+	x -= image->common.alpha_origin_x;
+	y -= image->common.alpha_origin_y;
+
+	if (x < 0 || x >= image->common.alpha_map->width ||
+	    y < 0 || y >= image->common.alpha_map->height)
+	{
+	    ret->a = 0.f;
+	}
+	else
+	{
+	    argb_t alpha;
+
+	    alpha = image->common.alpha_map->fetch_pixel_float (
+		    image->common.alpha_map, x, y);
+
+	    ret->a = alpha.a;
+	}
+    }
+}
+
+static uint32_t *
+__bits_image_fetch_general (pixman_iter_t  *iter,
+			    pixman_bool_t wide,
+			    const uint32_t *mask)
+{
+    pixman_image_t *image  = iter->image;
+    int             offset = iter->x;
+    int             line   = iter->y++;
+    int             width  = iter->width;
+    uint32_t *      buffer = iter->buffer;
+    get_pixel_t     get_pixel =
+	wide ? fetch_pixel_general_float : fetch_pixel_general_32;
+
+    const uint32_t wide_zero[4] = {0};
+    pixman_fixed_t x, y, w;
+    pixman_fixed_t ux, uy, uw;
+    pixman_vector_t v;
+    int i;
+
+    /* reference point is the center of the pixel */
+    v.vector[0] = pixman_int_to_fixed (offset) + pixman_fixed_1 / 2;
+    v.vector[1] = pixman_int_to_fixed (line) + pixman_fixed_1 / 2;
+    v.vector[2] = pixman_fixed_1;
+
+    if (image->common.transform)
+    {
+	if (!pixman_transform_point_3d (image->common.transform, &v))
+	    return buffer;
+
+	ux = image->common.transform->matrix[0][0];
+	uy = image->common.transform->matrix[1][0];
+	uw = image->common.transform->matrix[2][0];
+    }
+    else
+    {
+	ux = pixman_fixed_1;
+	uy = 0;
+	uw = 0;
+    }
+
+    x = v.vector[0];
+    y = v.vector[1];
+    w = v.vector[2];
+
+    for (i = 0; i < width; ++i)
+    {
+	pixman_fixed_t x0, y0;
+
+	if (!mask || (!wide && mask[i]) ||
+	    (wide && memcmp(&mask[4 * i], wide_zero, 16) != 0))
+	{
+	    if (w != 0)
+	    {
+		x0 = ((uint64_t)x << 16) / w;
+		y0 = ((uint64_t)y << 16) / w;
+	    }
+	    else
+	    {
+		x0 = 0;
+		y0 = 0;
+	    }
+
+	    bits_image_fetch_pixel_filtered (
+		&image->bits, wide, x0, y0, get_pixel, buffer);
+	}
+
+	x += ux;
+	y += uy;
+	w += uw;
+	buffer += wide ? 4 : 1;
+    }
+
+    return iter->buffer;
+}
+
+static uint32_t *
+bits_image_fetch_general_32 (pixman_iter_t  *iter,
+			     const uint32_t *mask)
+{
+    return __bits_image_fetch_general(iter, FALSE, mask);
+}
+
+static uint32_t *
+bits_image_fetch_general_float (pixman_iter_t  *iter,
+				const uint32_t *mask)
+{
+    return __bits_image_fetch_general(iter, TRUE, mask);
+}
+
+static void
+replicate_pixel_32 (bits_image_t *   bits,
+		    int              x,
+		    int              y,
+		    int              width,
+		    uint32_t *       buffer)
+{
+    uint32_t color;
+    uint32_t *end;
+
+    color = bits->fetch_pixel_32 (bits, x, y);
+
+    end = buffer + width;
+    while (buffer < end)
+	*(buffer++) = color;
+}
+
+static void
+replicate_pixel_float (bits_image_t *   bits,
+		       int              x,
+		       int              y,
+		       int              width,
+		       uint32_t *       b)
+{
+    argb_t color;
+    argb_t *buffer = (argb_t *)b;
+    argb_t *end;
+
+    color = bits->fetch_pixel_float (bits, x, y);
+
+    end = buffer + width;
+    while (buffer < end)
+	*(buffer++) = color;
+}
+
+static void
+bits_image_fetch_untransformed_repeat_none (bits_image_t *image,
+                                            pixman_bool_t wide,
+                                            int           x,
+                                            int           y,
+                                            int           width,
+                                            uint32_t *    buffer)
+{
+    uint32_t w;
+
+    if (y < 0 || y >= image->height)
+    {
+	memset (buffer, 0, width * (wide? sizeof (argb_t) : 4));
+	return;
+    }
+
+    if (x < 0)
+    {
+	w = MIN (width, -x);
+
+	memset (buffer, 0, w * (wide ? sizeof (argb_t) : 4));
+
+	width -= w;
+	buffer += w * (wide? 4 : 1);
+	x += w;
+    }
+
+    if (x < image->width)
+    {
+	w = MIN (width, image->width - x);
+
+	if (wide)
+	    image->fetch_scanline_float (image, x, y, w, buffer, NULL);
+	else
+	    image->fetch_scanline_32 (image, x, y, w, buffer, NULL);
+
+	width -= w;
+	buffer += w * (wide? 4 : 1);
+	x += w;
+    }
+
+    memset (buffer, 0, width * (wide ? sizeof (argb_t) : 4));
+}
+
+static void
+bits_image_fetch_untransformed_repeat_normal (bits_image_t *image,
+                                              pixman_bool_t wide,
+                                              int           x,
+                                              int           y,
+                                              int           width,
+                                              uint32_t *    buffer)
+{
+    uint32_t w;
+
+    while (y < 0)
+	y += image->height;
+
+    while (y >= image->height)
+	y -= image->height;
+
+    if (image->width == 1)
+    {
+	if (wide)
+	    replicate_pixel_float (image, 0, y, width, buffer);
+	else
+	    replicate_pixel_32 (image, 0, y, width, buffer);
+
+	return;
+    }
+
+    while (width)
+    {
+	while (x < 0)
+	    x += image->width;
+	while (x >= image->width)
+	    x -= image->width;
+
+	w = MIN (width, image->width - x);
+
+	if (wide)
+	    image->fetch_scanline_float (image, x, y, w, buffer, NULL);
+	else
+	    image->fetch_scanline_32 (image, x, y, w, buffer, NULL);
+
+	buffer += w * (wide? 4 : 1);
+	x += w;
+	width -= w;
+    }
+}
+
+static uint32_t *
+bits_image_fetch_untransformed_32 (pixman_iter_t * iter,
+				   const uint32_t *mask)
+{
+    pixman_image_t *image  = iter->image;
+    int             x      = iter->x;
+    int             y      = iter->y;
+    int             width  = iter->width;
+    uint32_t *      buffer = iter->buffer;
+
+    if (image->common.repeat == PIXMAN_REPEAT_NONE)
+    {
+	bits_image_fetch_untransformed_repeat_none (
+	    &image->bits, FALSE, x, y, width, buffer);
+    }
+    else
+    {
+	bits_image_fetch_untransformed_repeat_normal (
+	    &image->bits, FALSE, x, y, width, buffer);
+    }
+
+    iter->y++;
+    return buffer;
+}
+
+static uint32_t *
+bits_image_fetch_untransformed_float (pixman_iter_t * iter,
+				      const uint32_t *mask)
+{
+    pixman_image_t *image  = iter->image;
+    int             x      = iter->x;
+    int             y      = iter->y;
+    int             width  = iter->width;
+    uint32_t *      buffer = iter->buffer;
+
+    if (image->common.repeat == PIXMAN_REPEAT_NONE)
+    {
+	bits_image_fetch_untransformed_repeat_none (
+	    &image->bits, TRUE, x, y, width, buffer);
+    }
+    else
+    {
+	bits_image_fetch_untransformed_repeat_normal (
+	    &image->bits, TRUE, x, y, width, buffer);
+    }
+
+    iter->y++;
+    return buffer;
+}
+
+typedef struct
+{
+    pixman_format_code_t	format;
+    uint32_t			flags;
+    pixman_iter_get_scanline_t	get_scanline_32;
+    pixman_iter_get_scanline_t  get_scanline_float;
+} fetcher_info_t;
+
+static const fetcher_info_t fetcher_info[] =
+{
+    { PIXMAN_any,
+      (FAST_PATH_NO_ALPHA_MAP			|
+       FAST_PATH_ID_TRANSFORM			|
+       FAST_PATH_NO_CONVOLUTION_FILTER		|
+       FAST_PATH_NO_PAD_REPEAT			|
+       FAST_PATH_NO_REFLECT_REPEAT),
+      bits_image_fetch_untransformed_32,
+      bits_image_fetch_untransformed_float
+    },
+
+    /* Affine, no alpha */
+    { PIXMAN_any,
+      (FAST_PATH_NO_ALPHA_MAP | FAST_PATH_HAS_TRANSFORM | FAST_PATH_AFFINE_TRANSFORM),
+      bits_image_fetch_affine_no_alpha_32,
+      bits_image_fetch_affine_no_alpha_float,
+    },
+
+    /* General */
+    { PIXMAN_any,
+      0,
+      bits_image_fetch_general_32,
+      bits_image_fetch_general_float,
+    },
+
+    { PIXMAN_null },
+};
+
+static void
+bits_image_property_changed (pixman_image_t *image)
+{
+    _pixman_bits_image_setup_accessors (&image->bits);
+}
+
+void
+_pixman_bits_image_src_iter_init (pixman_image_t *image, pixman_iter_t *iter)
+{
+    pixman_format_code_t format = image->common.extended_format_code;
+    uint32_t flags = image->common.flags;
+    const fetcher_info_t *info;
+
+    for (info = fetcher_info; info->format != PIXMAN_null; ++info)
+    {
+	if ((info->format == format || info->format == PIXMAN_any)	&&
+	    (info->flags & flags) == info->flags)
+	{
+	    if (iter->iter_flags & ITER_NARROW)
+	    {
+		iter->get_scanline = info->get_scanline_32;
+	    }
+	    else
+	    {
+		iter->get_scanline = info->get_scanline_float;
+	    }
+	    return;
+	}
+    }
+
+    /* Just in case we somehow didn't find a scanline function */
+    iter->get_scanline = _pixman_iter_get_scanline_noop;
+}
+
+static uint32_t *
+dest_get_scanline_narrow (pixman_iter_t *iter, const uint32_t *mask)
+{
+    pixman_image_t *image  = iter->image;
+    int             x      = iter->x;
+    int             y      = iter->y;
+    int             width  = iter->width;
+    uint32_t *	    buffer = iter->buffer;
+
+    image->bits.fetch_scanline_32 (&image->bits, x, y, width, buffer, mask);
+    if (image->common.alpha_map)
+    {
+	uint32_t *alpha;
+
+	if ((alpha = malloc (width * sizeof (uint32_t))))
+	{
+	    int i;
+
+	    x -= image->common.alpha_origin_x;
+	    y -= image->common.alpha_origin_y;
+
+	    image->common.alpha_map->fetch_scanline_32 (
+		image->common.alpha_map, x, y, width, alpha, mask);
+
+	    for (i = 0; i < width; ++i)
+	    {
+		buffer[i] &= ~0xff000000;
+		buffer[i] |= (alpha[i] & 0xff000000);
+	    }
+
+	    free (alpha);
+	}
+    }
+
+    return iter->buffer;
+}
+
+static uint32_t *
+dest_get_scanline_wide (pixman_iter_t *iter, const uint32_t *mask)
+{
+    bits_image_t *  image  = &iter->image->bits;
+    int             x      = iter->x;
+    int             y      = iter->y;
+    int             width  = iter->width;
+    argb_t *	    buffer = (argb_t *)iter->buffer;
+
+    image->fetch_scanline_float (
+	image, x, y, width, (uint32_t *)buffer, mask);
+    if (image->common.alpha_map)
+    {
+	argb_t *alpha;
+
+	if ((alpha = malloc (width * sizeof (argb_t))))
+	{
+	    int i;
+
+	    x -= image->common.alpha_origin_x;
+	    y -= image->common.alpha_origin_y;
+
+	    image->common.alpha_map->fetch_scanline_float (
+		image->common.alpha_map, x, y, width, (uint32_t *)alpha, mask);
+
+	    for (i = 0; i < width; ++i)
+		buffer[i].a = alpha[i].a;
+
+	    free (alpha);
+	}
+    }
+
+    return iter->buffer;
+}
+
+static void
+dest_write_back_narrow (pixman_iter_t *iter)
+{
+    bits_image_t *  image  = &iter->image->bits;
+    int             x      = iter->x;
+    int             y      = iter->y;
+    int             width  = iter->width;
+    const uint32_t *buffer = iter->buffer;
+
+    image->store_scanline_32 (image, x, y, width, buffer);
+
+    if (image->common.alpha_map)
+    {
+	x -= image->common.alpha_origin_x;
+	y -= image->common.alpha_origin_y;
+
+	image->common.alpha_map->store_scanline_32 (
+	    image->common.alpha_map, x, y, width, buffer);
+    }
+
+    iter->y++;
+}
+
+static float
+dither_factor_blue_noise_64 (int x, int y)
+{
+    float m = dither_blue_noise_64x64[((y & 0x3f) << 6) | (x & 0x3f)];
+    return m * (1. / 4096.f) + (1. / 8192.f);
+}
+
+static float
+dither_factor_bayer_8 (int x, int y)
+{
+    uint32_t m;
+
+    y ^= x;
+
+    /* Compute reverse(interleave(xor(x mod n, y mod n), x mod n))
+     * Here n = 8 and `mod n` is the bottom 3 bits.
+     */
+    m = ((y & 0x1) << 5) | ((x & 0x1) << 4) |
+	((y & 0x2) << 2) | ((x & 0x2) << 1) |
+	((y & 0x4) >> 1) | ((x & 0x4) >> 2);
+
+    /* m is in range [0, 63].  We scale it to [0, 63.0f/64.0f], then
+     * shift it to to [1.0f/128.0f, 127.0f/128.0f] so that 0 < d < 1.
+     * This ensures exact values are not changed by dithering.
+     */
+    return (float)(m) * (1 / 64.0f) + (1.0f / 128.0f);
+}
+
+typedef float (* dither_factor_t)(int x, int y);
+
+static force_inline float
+dither_apply_channel (float f, float d, float s)
+{
+    /* float_to_unorm splits the [0, 1] segment in (1 << n_bits)
+     * subsections of equal length; however unorm_to_float does not
+     * map to the center of those sections.  In fact, pixel value u is
+     * mapped to:
+     *
+     *       u              u              u               1
+     * -------------- = ---------- + -------------- * ----------
+     *  2^n_bits - 1     2^n_bits     2^n_bits - 1     2^n_bits
+     *
+     * Hence if f = u / (2^n_bits - 1) is exactly representable on a
+     * n_bits palette, all the numbers between
+     *
+     *     u
+     * ----------  =  f - f * 2^n_bits = f + (0 - f) * 2^n_bits
+     *  2^n_bits
+     *
+     *  and
+     *
+     *    u + 1
+     * ---------- = f - (f - 1) * 2^n_bits = f + (1 - f) * 2^n_bits
+     *  2^n_bits
+     *
+     * are also mapped back to u.
+     *
+     * Hence the following calculation ensures that we add as much
+     * noise as possible without perturbing values which are exactly
+     * representable in the target colorspace.  Note that this corresponds to
+     * mixing the original color with noise with a ratio of `1 / 2^n_bits`.
+     */
+    return f + (d - f) * s;
+}
+
+static force_inline float
+dither_compute_scale (int n_bits)
+{
+    // No dithering for wide formats
+    if (n_bits == 0 || n_bits >= 32)
+	return 0.f;
+
+    return 1.f / (float)(1 << n_bits);
+}
+
+static const uint32_t *
+dither_apply_ordered (pixman_iter_t *iter, dither_factor_t factor)
+{
+    bits_image_t        *image  = &iter->image->bits;
+    int                  x      = iter->x + image->dither_offset_x;
+    int                  y      = iter->y + image->dither_offset_y;
+    int                  width  = iter->width;
+    argb_t              *buffer = (argb_t *)iter->buffer;
+
+    pixman_format_code_t format = image->format;
+    int                  a_size = PIXMAN_FORMAT_A (format);
+    int                  r_size = PIXMAN_FORMAT_R (format);
+    int                  g_size = PIXMAN_FORMAT_G (format);
+    int                  b_size = PIXMAN_FORMAT_B (format);
+
+    float a_scale = dither_compute_scale (a_size);
+    float r_scale = dither_compute_scale (r_size);
+    float g_scale = dither_compute_scale (g_size);
+    float b_scale = dither_compute_scale (b_size);
+
+    int   i;
+    float d;
+
+    for (i = 0; i < width; ++i)
+    {
+	d = factor (x + i, y);
+
+	buffer->a = dither_apply_channel (buffer->a, d, a_scale);
+	buffer->r = dither_apply_channel (buffer->r, d, r_scale);
+	buffer->g = dither_apply_channel (buffer->g, d, g_scale);
+	buffer->b = dither_apply_channel (buffer->b, d, b_scale);
+
+	buffer++;
+    }
+
+    return iter->buffer;
+}
+
+static void
+dest_write_back_wide (pixman_iter_t *iter)
+{
+    bits_image_t *  image  = &iter->image->bits;
+    int             x      = iter->x;
+    int             y      = iter->y;
+    int             width  = iter->width;
+    const uint32_t *buffer = iter->buffer;
+
+    switch (image->dither)
+    {
+    case PIXMAN_DITHER_NONE:
+	break;
+
+    case PIXMAN_DITHER_GOOD:
+    case PIXMAN_DITHER_BEST:
+    case PIXMAN_DITHER_ORDERED_BLUE_NOISE_64:
+	buffer = dither_apply_ordered (iter, dither_factor_blue_noise_64);
+	break;
+
+    case PIXMAN_DITHER_FAST:
+    case PIXMAN_DITHER_ORDERED_BAYER_8:
+	buffer = dither_apply_ordered (iter, dither_factor_bayer_8);
+	break;
+    }
+
+    image->store_scanline_float (image, x, y, width, buffer);
+
+    if (image->common.alpha_map)
+    {
+	x -= image->common.alpha_origin_x;
+	y -= image->common.alpha_origin_y;
+
+	image->common.alpha_map->store_scanline_float (
+	    image->common.alpha_map, x, y, width, buffer);
+    }
+
+    iter->y++;
+}
+
+void
+_pixman_bits_image_dest_iter_init (pixman_image_t *image, pixman_iter_t *iter)
+{
+    if (iter->iter_flags & ITER_NARROW)
+    {
+	if ((iter->iter_flags & (ITER_IGNORE_RGB | ITER_IGNORE_ALPHA)) ==
+	    (ITER_IGNORE_RGB | ITER_IGNORE_ALPHA))
+	{
+	    iter->get_scanline = _pixman_iter_get_scanline_noop;
+	}
+	else
+	{
+	    iter->get_scanline = dest_get_scanline_narrow;
+	}
+	
+	iter->write_back = dest_write_back_narrow;
+    }
+    else
+    {
+	iter->get_scanline = dest_get_scanline_wide;
+	iter->write_back = dest_write_back_wide;
+    }
+}
+
+static uint32_t *
+create_bits (pixman_format_code_t format,
+             int                  width,
+             int                  height,
+             int *		  rowstride_bytes,
+	     pixman_bool_t	  clear)
+{
+    int stride;
+    size_t buf_size;
+    int bpp;
+
+    /* what follows is a long-winded way, avoiding any possibility of integer
+     * overflows, of saying:
+     * stride = ((width * bpp + 0x1f) >> 5) * sizeof (uint32_t);
+     */
+
+    bpp = PIXMAN_FORMAT_BPP (format);
+    if (_pixman_multiply_overflows_int (width, bpp))
+	return NULL;
+
+    stride = width * bpp;
+    if (_pixman_addition_overflows_int (stride, 0x1f))
+	return NULL;
+
+    stride += 0x1f;
+    stride >>= 5;
+
+    stride *= sizeof (uint32_t);
+
+    if (_pixman_multiply_overflows_size (height, stride))
+	return NULL;
+
+    buf_size = (size_t)height * stride;
+
+    if (rowstride_bytes)
+	*rowstride_bytes = stride;
+
+    if (clear)
+	return calloc (buf_size, 1);
+    else
+	return malloc (buf_size);
+}
+
+pixman_bool_t
+_pixman_bits_image_init (pixman_image_t *     image,
+                         pixman_format_code_t format,
+                         int                  width,
+                         int                  height,
+                         uint32_t *           bits,
+                         int                  rowstride,
+			 pixman_bool_t	      clear)
+{
+    uint32_t *free_me = NULL;
+
+    if (PIXMAN_FORMAT_BPP (format) == 128)
+	return_val_if_fail(!(rowstride % 4), FALSE);
+
+    if (!bits && width && height)
+    {
+	int rowstride_bytes;
+
+	free_me = bits = create_bits (format, width, height, &rowstride_bytes, clear);
+
+	if (!bits)
+	    return FALSE;
+
+	rowstride = rowstride_bytes / (int) sizeof (uint32_t);
+    }
+
+    _pixman_image_init (image);
+
+    image->type = BITS;
+    image->bits.format = format;
+    image->bits.width = width;
+    image->bits.height = height;
+    image->bits.bits = bits;
+    image->bits.free_me = free_me;
+    image->bits.dither = PIXMAN_DITHER_NONE;
+    image->bits.dither_offset_x = 0;
+    image->bits.dither_offset_y = 0;
+    image->bits.read_func = NULL;
+    image->bits.write_func = NULL;
+    image->bits.rowstride = rowstride;
+    image->bits.indexed = NULL;
+
+    image->common.property_changed = bits_image_property_changed;
+
+    _pixman_image_reset_clip_region (image);
+
+    return TRUE;
+}
+
+static pixman_image_t *
+create_bits_image_internal (pixman_format_code_t format,
+			    int                  width,
+			    int                  height,
+			    uint32_t *           bits,
+			    int                  rowstride_bytes,
+			    pixman_bool_t	 clear)
+{
+    pixman_image_t *image;
+
+    /* must be a whole number of uint32_t's
+     */
+    return_val_if_fail (
+	bits == NULL || (rowstride_bytes % sizeof (uint32_t)) == 0, NULL);
+
+    return_val_if_fail (PIXMAN_FORMAT_BPP (format) >= PIXMAN_FORMAT_DEPTH (format), NULL);
+
+    image = _pixman_image_allocate ();
+
+    if (!image)
+	return NULL;
+
+    if (!_pixman_bits_image_init (image, format, width, height, bits,
+				  rowstride_bytes / (int) sizeof (uint32_t),
+				  clear))
+    {
+	free (image);
+	return NULL;
+    }
+
+    return image;
+}
+
+/* If bits is NULL, a buffer will be allocated and initialized to 0 */
+PIXMAN_EXPORT pixman_image_t *
+pixman_image_create_bits (pixman_format_code_t format,
+                          int                  width,
+                          int                  height,
+                          uint32_t *           bits,
+                          int                  rowstride_bytes)
+{
+    return create_bits_image_internal (
+	format, width, height, bits, rowstride_bytes, TRUE);
+}
+
+
+/* If bits is NULL, a buffer will be allocated and _not_ initialized */
+PIXMAN_EXPORT pixman_image_t *
+pixman_image_create_bits_no_clear (pixman_format_code_t format,
+				   int                  width,
+				   int                  height,
+				   uint32_t *           bits,
+				   int                  rowstride_bytes)
+{
+    return create_bits_image_internal (
+	format, width, height, bits, rowstride_bytes, FALSE);
+}