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-rw-r--r--gfx/cairo/pixman-dither.patch310
1 files changed, 0 insertions, 310 deletions
diff --git a/gfx/cairo/pixman-dither.patch b/gfx/cairo/pixman-dither.patch
deleted file mode 100644
index 633a8d728..000000000
--- a/gfx/cairo/pixman-dither.patch
+++ /dev/null
@@ -1,310 +0,0 @@
-diff --git a/gfx/cairo/libpixman/src/pixman-dither.h b/gfx/cairo/libpixman/src/pixman-dither.h
-new file mode 100644
---- /dev/null
-+++ b/gfx/cairo/libpixman/src/pixman-dither.h
-@@ -0,0 +1,51 @@
-+#define R16_BITS 5
-+#define G16_BITS 6
-+#define B16_BITS 5
-+
-+#define R16_SHIFT (B16_BITS + G16_BITS)
-+#define G16_SHIFT (B16_BITS)
-+#define B16_SHIFT 0
-+
-+#define MASK 0xff
-+#define ONE_HALF 0x80
-+
-+#define A_SHIFT 8 * 3
-+#define R_SHIFT 8 * 2
-+#define G_SHIFT 8
-+#define A_MASK 0xff000000
-+#define R_MASK 0xff0000
-+#define G_MASK 0xff00
-+
-+#define RB_MASK 0xff00ff
-+#define AG_MASK 0xff00ff00
-+#define RB_ONE_HALF 0x800080
-+#define RB_MASK_PLUS_ONE 0x10000100
-+
-+#define ALPHA_8(x) ((x) >> A_SHIFT)
-+#define RED_8(x) (((x) >> R_SHIFT) & MASK)
-+#define GREEN_8(x) (((x) >> G_SHIFT) & MASK)
-+#define BLUE_8(x) ((x) & MASK)
-+
-+// This uses the same dithering technique that Skia does.
-+// It is essentially preturbing the lower bit based on the
-+// high bit
-+static inline uint16_t dither_32_to_16(uint32_t c)
-+{
-+ uint8_t b = BLUE_8(c);
-+ uint8_t g = GREEN_8(c);
-+ uint8_t r = RED_8(c);
-+ r = ((r << 1) - ((r >> (8 - R16_BITS) << (8 - R16_BITS)) | (r >> R16_BITS))) >> (8 - R16_BITS);
-+ g = ((g << 1) - ((g >> (8 - G16_BITS) << (8 - G16_BITS)) | (g >> G16_BITS))) >> (8 - G16_BITS);
-+ b = ((b << 1) - ((b >> (8 - B16_BITS) << (8 - B16_BITS)) | (b >> B16_BITS))) >> (8 - B16_BITS);
-+ return ((r << R16_SHIFT) | (g << G16_SHIFT) | (b << B16_SHIFT));
-+}
-+
-+static inline uint16_t dither_8888_to_0565(uint32_t color, pixman_bool_t toggle)
-+{
-+ // alternate between a preturbed truncation and a regular truncation
-+ if (toggle) {
-+ return dither_32_to_16(color);
-+ } else {
-+ return CONVERT_8888_TO_0565(color);
-+ }
-+}
-diff --git a/gfx/cairo/libpixman/src/pixman-linear-gradient.c b/gfx/cairo/libpixman/src/pixman-linear-gradient.c
---- a/gfx/cairo/libpixman/src/pixman-linear-gradient.c
-+++ b/gfx/cairo/libpixman/src/pixman-linear-gradient.c
-@@ -26,16 +26,18 @@
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include <stdlib.h>
- #include "pixman-private.h"
-
-+#include "pixman-dither.h"
-+
- static pixman_bool_t
- linear_gradient_is_horizontal (pixman_image_t *image,
- int x,
- int y,
- int width,
- int height)
- {
- linear_gradient_t *linear = (linear_gradient_t *)image;
-@@ -222,25 +224,28 @@ linear_get_scanline_narrow (pixman_iter_
- return iter->buffer;
- }
-
- static uint16_t convert_8888_to_0565(uint32_t color)
- {
- return CONVERT_8888_TO_0565(color);
- }
-
-+
-+
- static uint32_t *
- linear_get_scanline_16 (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;
- uint16_t * buffer = (uint16_t*)iter->buffer;
-+ pixman_bool_t toggle = ((x ^ y) & 1);
-
- pixman_vector_t v, unit;
- pixman_fixed_32_32_t l;
- pixman_fixed_48_16_t dx, dy;
- gradient_t *gradient = (gradient_t *)image;
- linear_gradient_t *linear = (linear_gradient_t *)image;
- uint16_t *end = buffer + width;
- pixman_gradient_walker_t walker;
-@@ -294,34 +299,47 @@ linear_get_scanline_16 (pixman_iter_t *
- t = ((dx * v.vector[0] + dy * v.vector[1]) -
- (dx * linear->p1.x + dy * linear->p1.y) * v2) * invden;
- inc = (dx * unit.vector[0] + dy * unit.vector[1]) * invden;
- }
- next_inc = 0;
-
- if (((pixman_fixed_32_32_t )(inc * width)) == 0)
- {
-- register uint16_t color;
-+ register uint32_t color;
-+ uint16_t dither_diff;
-+ uint16_t color16;
-+ uint16_t color16b;
-
-- color = convert_8888_to_0565(_pixman_gradient_walker_pixel (&walker, t));
-- while (buffer < end)
-- *buffer++ = color;
-+ color = _pixman_gradient_walker_pixel (&walker, t);
-+ color16 = dither_8888_to_0565(color, toggle);
-+ color16b = dither_8888_to_0565(color, toggle^1);
-+ // compute the difference
-+ dither_diff = color16 ^ color16b;
-+ while (buffer < end) {
-+ *buffer++ = color16;
-+ // use dither_diff to toggle between color16 and color16b
-+ color16 ^= dither_diff;
-+ toggle ^= 1;
-+ }
- }
- else
- {
- int i;
-
- i = 0;
- while (buffer < end)
- {
- if (!mask || *mask++)
- {
-- *buffer = convert_8888_to_0565(_pixman_gradient_walker_pixel (&walker,
-- t + next_inc));
-+ *buffer = dither_8888_to_0565(_pixman_gradient_walker_pixel (&walker,
-+ t + next_inc),
-+ toggle);
- }
-+ toggle ^= 1;
- i++;
- next_inc = inc * i;
- buffer++;
- }
- }
- }
- else
- {
-@@ -340,18 +358,20 @@ linear_get_scanline_16 (pixman_iter_t *
-
- invden = pixman_fixed_1 * (double) pixman_fixed_1 /
- (l * (double) v.vector[2]);
- v2 = v.vector[2] * (1. / pixman_fixed_1);
- t = ((dx * v.vector[0] + dy * v.vector[1]) -
- (dx * linear->p1.x + dy * linear->p1.y) * v2) * invden;
- }
-
-- *buffer = convert_8888_to_0565(_pixman_gradient_walker_pixel (&walker, t));
-+ *buffer = dither_8888_to_0565(_pixman_gradient_walker_pixel (&walker, t),
-+ toggle);
- }
-+ toggle ^= 1;
-
- ++buffer;
-
- v.vector[0] += unit.vector[0];
- v.vector[1] += unit.vector[1];
- v.vector[2] += unit.vector[2];
- }
- }
-@@ -369,17 +389,18 @@ linear_get_scanline_wide (pixman_iter_t
- pixman_expand ((uint64_t *)buffer, buffer, PIXMAN_a8r8g8b8, iter->width);
-
- return buffer;
- }
-
- void
- _pixman_linear_gradient_iter_init (pixman_image_t *image, pixman_iter_t *iter)
- {
-- if (linear_gradient_is_horizontal (
-+ // XXX: we can't use this optimization when dithering
-+ if (0 && linear_gradient_is_horizontal (
- iter->image, iter->x, iter->y, iter->width, iter->height))
- {
- if (iter->flags & ITER_16)
- linear_get_scanline_16 (iter, NULL);
- else if (iter->flags & ITER_NARROW)
- linear_get_scanline_narrow (iter, NULL);
- else
- linear_get_scanline_wide (iter, NULL);
-diff --git a/gfx/cairo/libpixman/src/pixman-radial-gradient.c b/gfx/cairo/libpixman/src/pixman-radial-gradient.c
---- a/gfx/cairo/libpixman/src/pixman-radial-gradient.c
-+++ b/gfx/cairo/libpixman/src/pixman-radial-gradient.c
-@@ -29,16 +29,18 @@
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include <stdlib.h>
- #include <math.h>
- #include "pixman-private.h"
-
-+#include "pixman-dither.h"
-+
- static inline pixman_fixed_32_32_t
- dot (pixman_fixed_48_16_t x1,
- pixman_fixed_48_16_t y1,
- pixman_fixed_48_16_t z1,
- pixman_fixed_48_16_t x2,
- pixman_fixed_48_16_t y2,
- pixman_fixed_48_16_t z2)
- {
-@@ -489,16 +491,17 @@ radial_get_scanline_16 (pixman_iter_t *i
- * <=> for every p, the radiuses associated with the two t solutions
- * have opposite sign
- */
- pixman_image_t *image = iter->image;
- int x = iter->x;
- int y = iter->y;
- int width = iter->width;
- uint16_t *buffer = iter->buffer;
-+ pixman_bool_t toggle = ((x ^ y) & 1);
-
- gradient_t *gradient = (gradient_t *)image;
- radial_gradient_t *radial = (radial_gradient_t *)image;
- uint16_t *end = buffer + width;
- pixman_gradient_walker_t walker;
- pixman_vector_t v, unit;
-
- /* reference point is the center of the pixel */
-@@ -575,25 +578,27 @@ radial_get_scanline_16 (pixman_iter_t *i
- unit.vector[0], unit.vector[1], 0);
- ddc = 2 * dot (unit.vector[0], unit.vector[1], 0,
- unit.vector[0], unit.vector[1], 0);
-
- while (buffer < end)
- {
- if (!mask || *mask++)
- {
-- *buffer = convert_8888_to_0565(
-+ *buffer = dither_8888_to_0565(
- radial_compute_color (radial->a, b, c,
- radial->inva,
- radial->delta.radius,
- radial->mindr,
- &walker,
-- image->common.repeat));
-+ image->common.repeat),
-+ toggle);
- }
-
-+ toggle ^= 1;
- b += db;
- c += dc;
- dc += ddc;
- ++buffer;
- }
- }
- else
- {
-@@ -621,31 +626,33 @@ radial_get_scanline_16 (pixman_iter_t *i
- radial->delta.x, radial->delta.y,
- radial->delta.radius);
- /* / pixman_fixed_1 / pixman_fixed_1 */
-
- c = fdot (pdx, pdy, -radial->c1.radius,
- pdx, pdy, radial->c1.radius);
- /* / pixman_fixed_1 / pixman_fixed_1 */
-
-- *buffer = convert_8888_to_0565 (
-+ *buffer = dither_8888_to_0565 (
- radial_compute_color (radial->a, b, c,
- radial->inva,
- radial->delta.radius,
- radial->mindr,
- &walker,
-- image->common.repeat));
-+ image->common.repeat),
-+ toggle);
- }
- else
- {
- *buffer = 0;
- }
- }
-
- ++buffer;
-+ toggle ^= 1;
-
- v.vector[0] += unit.vector[0];
- v.vector[1] += unit.vector[1];
- v.vector[2] += unit.vector[2];
- }
- }
-
- iter->y++;
-
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