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kolibrios/programs/develop/libraries/pixman/pixman.c

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pixman-1.0 git-svn-id: svn://kolibrios.org@1891 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-02-27 18:46:46 +01:00
/* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */
/*
* Copyright © 2000 SuSE, Inc.
* Copyright © 2007 Red Hat, Inc.
*
* 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 SuSE not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. SuSE makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
* 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.
*
* Author: Keith Packard, SuSE, Inc.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "pixman-private.h"
#include <stdlib.h>
static force_inline pixman_implementation_t *
get_implementation (void)
{
static pixman_implementation_t *global_implementation;
if (!global_implementation)
global_implementation = _pixman_choose_implementation ();
return global_implementation;
}
typedef struct operator_info_t operator_info_t;
struct operator_info_t
{
uint8_t opaque_info[4];
};
#define PACK(neither, src, dest, both) \
{{ (uint8_t)PIXMAN_OP_ ## neither, \
(uint8_t)PIXMAN_OP_ ## src, \
(uint8_t)PIXMAN_OP_ ## dest, \
(uint8_t)PIXMAN_OP_ ## both }}
static const operator_info_t operator_table[] =
{
/* Neither Opaque Src Opaque Dst Opaque Both Opaque */
PACK (CLEAR, CLEAR, CLEAR, CLEAR),
PACK (SRC, SRC, SRC, SRC),
PACK (DST, DST, DST, DST),
PACK (OVER, SRC, OVER, SRC),
PACK (OVER_REVERSE, OVER_REVERSE, DST, DST),
PACK (IN, IN, SRC, SRC),
PACK (IN_REVERSE, DST, IN_REVERSE, DST),
PACK (OUT, OUT, CLEAR, CLEAR),
PACK (OUT_REVERSE, CLEAR, OUT_REVERSE, CLEAR),
PACK (ATOP, IN, OVER, SRC),
PACK (ATOP_REVERSE, OVER_REVERSE, IN_REVERSE, DST),
PACK (XOR, OUT, OUT_REVERSE, CLEAR),
PACK (ADD, ADD, ADD, ADD),
PACK (SATURATE, OVER_REVERSE, DST, DST),
{{ 0 /* 0x0e */ }},
{{ 0 /* 0x0f */ }},
PACK (CLEAR, CLEAR, CLEAR, CLEAR),
PACK (SRC, SRC, SRC, SRC),
PACK (DST, DST, DST, DST),
PACK (DISJOINT_OVER, DISJOINT_OVER, DISJOINT_OVER, DISJOINT_OVER),
PACK (DISJOINT_OVER_REVERSE, DISJOINT_OVER_REVERSE, DISJOINT_OVER_REVERSE, DISJOINT_OVER_REVERSE),
PACK (DISJOINT_IN, DISJOINT_IN, DISJOINT_IN, DISJOINT_IN),
PACK (DISJOINT_IN_REVERSE, DISJOINT_IN_REVERSE, DISJOINT_IN_REVERSE, DISJOINT_IN_REVERSE),
PACK (DISJOINT_OUT, DISJOINT_OUT, DISJOINT_OUT, DISJOINT_OUT),
PACK (DISJOINT_OUT_REVERSE, DISJOINT_OUT_REVERSE, DISJOINT_OUT_REVERSE, DISJOINT_OUT_REVERSE),
PACK (DISJOINT_ATOP, DISJOINT_ATOP, DISJOINT_ATOP, DISJOINT_ATOP),
PACK (DISJOINT_ATOP_REVERSE, DISJOINT_ATOP_REVERSE, DISJOINT_ATOP_REVERSE, DISJOINT_ATOP_REVERSE),
PACK (DISJOINT_XOR, DISJOINT_XOR, DISJOINT_XOR, DISJOINT_XOR),
{{ 0 /* 0x1c */ }},
{{ 0 /* 0x1d */ }},
{{ 0 /* 0x1e */ }},
{{ 0 /* 0x1f */ }},
PACK (CLEAR, CLEAR, CLEAR, CLEAR),
PACK (SRC, SRC, SRC, SRC),
PACK (DST, DST, DST, DST),
PACK (CONJOINT_OVER, CONJOINT_OVER, CONJOINT_OVER, CONJOINT_OVER),
PACK (CONJOINT_OVER_REVERSE, CONJOINT_OVER_REVERSE, CONJOINT_OVER_REVERSE, CONJOINT_OVER_REVERSE),
PACK (CONJOINT_IN, CONJOINT_IN, CONJOINT_IN, CONJOINT_IN),
PACK (CONJOINT_IN_REVERSE, CONJOINT_IN_REVERSE, CONJOINT_IN_REVERSE, CONJOINT_IN_REVERSE),
PACK (CONJOINT_OUT, CONJOINT_OUT, CONJOINT_OUT, CONJOINT_OUT),
PACK (CONJOINT_OUT_REVERSE, CONJOINT_OUT_REVERSE, CONJOINT_OUT_REVERSE, CONJOINT_OUT_REVERSE),
PACK (CONJOINT_ATOP, CONJOINT_ATOP, CONJOINT_ATOP, CONJOINT_ATOP),
PACK (CONJOINT_ATOP_REVERSE, CONJOINT_ATOP_REVERSE, CONJOINT_ATOP_REVERSE, CONJOINT_ATOP_REVERSE),
PACK (CONJOINT_XOR, CONJOINT_XOR, CONJOINT_XOR, CONJOINT_XOR),
{{ 0 /* 0x2c */ }},
{{ 0 /* 0x2d */ }},
{{ 0 /* 0x2e */ }},
{{ 0 /* 0x2f */ }},
PACK (MULTIPLY, MULTIPLY, MULTIPLY, MULTIPLY),
PACK (SCREEN, SCREEN, SCREEN, SCREEN),
PACK (OVERLAY, OVERLAY, OVERLAY, OVERLAY),
PACK (DARKEN, DARKEN, DARKEN, DARKEN),
PACK (LIGHTEN, LIGHTEN, LIGHTEN, LIGHTEN),
PACK (COLOR_DODGE, COLOR_DODGE, COLOR_DODGE, COLOR_DODGE),
PACK (COLOR_BURN, COLOR_BURN, COLOR_BURN, COLOR_BURN),
PACK (HARD_LIGHT, HARD_LIGHT, HARD_LIGHT, HARD_LIGHT),
PACK (SOFT_LIGHT, SOFT_LIGHT, SOFT_LIGHT, SOFT_LIGHT),
PACK (DIFFERENCE, DIFFERENCE, DIFFERENCE, DIFFERENCE),
PACK (EXCLUSION, EXCLUSION, EXCLUSION, EXCLUSION),
PACK (HSL_HUE, HSL_HUE, HSL_HUE, HSL_HUE),
PACK (HSL_SATURATION, HSL_SATURATION, HSL_SATURATION, HSL_SATURATION),
PACK (HSL_COLOR, HSL_COLOR, HSL_COLOR, HSL_COLOR),
PACK (HSL_LUMINOSITY, HSL_LUMINOSITY, HSL_LUMINOSITY, HSL_LUMINOSITY),
};
/*
* Optimize the current operator based on opacity of source or destination
* The output operator should be mathematically equivalent to the source.
*/
static pixman_op_t
optimize_operator (pixman_op_t op,
uint32_t src_flags,
uint32_t mask_flags,
uint32_t dst_flags)
{
pixman_bool_t is_source_opaque, is_dest_opaque;
#define OPAQUE_SHIFT 13
COMPILE_TIME_ASSERT (FAST_PATH_IS_OPAQUE == (1 << OPAQUE_SHIFT));
is_dest_opaque = (dst_flags & FAST_PATH_IS_OPAQUE);
is_source_opaque = ((src_flags & mask_flags) & FAST_PATH_IS_OPAQUE);
is_dest_opaque >>= OPAQUE_SHIFT - 1;
is_source_opaque >>= OPAQUE_SHIFT;
return operator_table[op].opaque_info[is_dest_opaque | is_source_opaque];
}
static void
apply_workaround (pixman_image_t *image,
int32_t * x,
int32_t * y,
uint32_t ** save_bits,
int * save_dx,
int * save_dy)
{
if (image && (image->common.flags & FAST_PATH_NEEDS_WORKAROUND))
{
/* Some X servers generate images that point to the
* wrong place in memory, but then set the clip region
* to point to the right place. Because of an old bug
* in pixman, this would actually work.
*
* Here we try and undo the damage
*/
int bpp = PIXMAN_FORMAT_BPP (image->bits.format) / 8;
pixman_box32_t *extents;
uint8_t *t;
int dx, dy;
extents = pixman_region32_extents (&(image->common.clip_region));
dx = extents->x1;
dy = extents->y1;
*save_bits = image->bits.bits;
*x -= dx;
*y -= dy;
pixman_region32_translate (&(image->common.clip_region), -dx, -dy);
t = (uint8_t *)image->bits.bits;
t += dy * image->bits.rowstride * 4 + dx * bpp;
image->bits.bits = (uint32_t *)t;
*save_dx = dx;
*save_dy = dy;
}
}
static void
unapply_workaround (pixman_image_t *image, uint32_t *bits, int dx, int dy)
{
if (image && (image->common.flags & FAST_PATH_NEEDS_WORKAROUND))
{
image->bits.bits = bits;
pixman_region32_translate (&image->common.clip_region, dx, dy);
}
}
/*
* Computing composite region
*/
static inline pixman_bool_t
clip_general_image (pixman_region32_t * region,
pixman_region32_t * clip,
int dx,
int dy)
{
if (pixman_region32_n_rects (region) == 1 &&
pixman_region32_n_rects (clip) == 1)
{
pixman_box32_t * rbox = pixman_region32_rectangles (region, NULL);
pixman_box32_t * cbox = pixman_region32_rectangles (clip, NULL);
int v;
if (rbox->x1 < (v = cbox->x1 + dx))
rbox->x1 = v;
if (rbox->x2 > (v = cbox->x2 + dx))
rbox->x2 = v;
if (rbox->y1 < (v = cbox->y1 + dy))
rbox->y1 = v;
if (rbox->y2 > (v = cbox->y2 + dy))
rbox->y2 = v;
if (rbox->x1 >= rbox->x2 || rbox->y1 >= rbox->y2)
{
pixman_region32_init (region);
return FALSE;
}
}
else if (!pixman_region32_not_empty (clip))
{
return FALSE;
}
else
{
if (dx || dy)
pixman_region32_translate (region, -dx, -dy);
if (!pixman_region32_intersect (region, region, clip))
return FALSE;
if (dx || dy)
pixman_region32_translate (region, dx, dy);
}
return pixman_region32_not_empty (region);
}
static inline pixman_bool_t
clip_source_image (pixman_region32_t * region,
pixman_image_t * image,
int dx,
int dy)
{
/* Source clips are ignored, unless they are explicitly turned on
* and the clip in question was set by an X client. (Because if
* the clip was not set by a client, then it is a hierarchy
* clip and those should always be ignored for sources).
*/
if (!image->common.clip_sources || !image->common.client_clip)
return TRUE;
return clip_general_image (region,
&image->common.clip_region,
dx, dy);
}
/*
* returns FALSE if the final region is empty. Indistinguishable from
* an allocation failure, but rendering ignores those anyways.
*/
static pixman_bool_t
pixman_compute_composite_region32 (pixman_region32_t * region,
pixman_image_t * src_image,
pixman_image_t * mask_image,
pixman_image_t * dst_image,
int32_t src_x,
int32_t src_y,
int32_t mask_x,
int32_t mask_y,
int32_t dest_x,
int32_t dest_y,
int32_t width,
int32_t height)
{
region->extents.x1 = dest_x;
region->extents.x2 = dest_x + width;
region->extents.y1 = dest_y;
region->extents.y2 = dest_y + height;
region->extents.x1 = MAX (region->extents.x1, 0);
region->extents.y1 = MAX (region->extents.y1, 0);
region->extents.x2 = MIN (region->extents.x2, dst_image->bits.width);
region->extents.y2 = MIN (region->extents.y2, dst_image->bits.height);
region->data = 0;
/* Check for empty operation */
if (region->extents.x1 >= region->extents.x2 ||
region->extents.y1 >= region->extents.y2)
{
region->extents.x1 = 0;
region->extents.x2 = 0;
region->extents.y1 = 0;
region->extents.y2 = 0;
return FALSE;
}
if (dst_image->common.have_clip_region)
{
if (!clip_general_image (region, &dst_image->common.clip_region, 0, 0))
return FALSE;
}
if (dst_image->common.alpha_map)
{
if (!pixman_region32_intersect_rect (region, region,
dst_image->common.alpha_origin_x,
dst_image->common.alpha_origin_y,
dst_image->common.alpha_map->width,
dst_image->common.alpha_map->height))
{
return FALSE;
}
if (!pixman_region32_not_empty (region))
return FALSE;
if (dst_image->common.alpha_map->common.have_clip_region)
{
if (!clip_general_image (region, &dst_image->common.alpha_map->common.clip_region,
-dst_image->common.alpha_origin_x,
-dst_image->common.alpha_origin_y))
{
return FALSE;
}
}
}
/* clip against src */
if (src_image->common.have_clip_region)
{
if (!clip_source_image (region, src_image, dest_x - src_x, dest_y - src_y))
return FALSE;
}
if (src_image->common.alpha_map && src_image->common.alpha_map->common.have_clip_region)
{
if (!clip_source_image (region, (pixman_image_t *)src_image->common.alpha_map,
dest_x - (src_x - src_image->common.alpha_origin_x),
dest_y - (src_y - src_image->common.alpha_origin_y)))
{
return FALSE;
}
}
/* clip against mask */
if (mask_image && mask_image->common.have_clip_region)
{
if (!clip_source_image (region, mask_image, dest_x - mask_x, dest_y - mask_y))
return FALSE;
if (mask_image->common.alpha_map && mask_image->common.alpha_map->common.have_clip_region)
{
if (!clip_source_image (region, (pixman_image_t *)mask_image->common.alpha_map,
dest_x - (mask_x - mask_image->common.alpha_origin_x),
dest_y - (mask_y - mask_image->common.alpha_origin_y)))
{
return FALSE;
}
}
}
return TRUE;
}
#define N_CACHED_FAST_PATHS 8
typedef struct
{
struct
{
pixman_implementation_t * imp;
pixman_fast_path_t fast_path;
} cache [N_CACHED_FAST_PATHS];
} cache_t;
PIXMAN_DEFINE_THREAD_LOCAL (cache_t, fast_path_cache);
static force_inline pixman_bool_t
lookup_composite_function (pixman_op_t op,
pixman_format_code_t src_format,
uint32_t src_flags,
pixman_format_code_t mask_format,
uint32_t mask_flags,
pixman_format_code_t dest_format,
uint32_t dest_flags,
pixman_implementation_t **out_imp,
pixman_composite_func_t *out_func)
{
pixman_implementation_t *imp;
cache_t *cache;
int i;
/* Check cache for fast paths */
cache = PIXMAN_GET_THREAD_LOCAL (fast_path_cache);
for (i = 0; i < N_CACHED_FAST_PATHS; ++i)
{
const pixman_fast_path_t *info = &(cache->cache[i].fast_path);
/* Note that we check for equality here, not whether
* the cached fast path matches. This is to prevent
* us from selecting an overly general fast path
* when a more specific one would work.
*/
if (info->op == op &&
info->src_format == src_format &&
info->mask_format == mask_format &&
info->dest_format == dest_format &&
info->src_flags == src_flags &&
info->mask_flags == mask_flags &&
info->dest_flags == dest_flags &&
info->func)
{
*out_imp = cache->cache[i].imp;
*out_func = cache->cache[i].fast_path.func;
goto update_cache;
}
}
for (imp = get_implementation (); imp != NULL; imp = imp->delegate)
{
const pixman_fast_path_t *info = imp->fast_paths;
while (info->op != PIXMAN_OP_NONE)
{
if ((info->op == op || info->op == PIXMAN_OP_any) &&
/* Formats */
((info->src_format == src_format) ||
(info->src_format == PIXMAN_any)) &&
((info->mask_format == mask_format) ||
(info->mask_format == PIXMAN_any)) &&
((info->dest_format == dest_format) ||
(info->dest_format == PIXMAN_any)) &&
/* Flags */
(info->src_flags & src_flags) == info->src_flags &&
(info->mask_flags & mask_flags) == info->mask_flags &&
(info->dest_flags & dest_flags) == info->dest_flags)
{
*out_imp = imp;
*out_func = info->func;
/* Set i to the last spot in the cache so that the
* move-to-front code below will work
*/
i = N_CACHED_FAST_PATHS - 1;
goto update_cache;
}
++info;
}
}
return FALSE;
update_cache:
if (i)
{
while (i--)
cache->cache[i + 1] = cache->cache[i];
cache->cache[0].imp = *out_imp;
cache->cache[0].fast_path.op = op;
cache->cache[0].fast_path.src_format = src_format;
cache->cache[0].fast_path.src_flags = src_flags;
cache->cache[0].fast_path.mask_format = mask_format;
cache->cache[0].fast_path.mask_flags = mask_flags;
cache->cache[0].fast_path.dest_format = dest_format;
cache->cache[0].fast_path.dest_flags = dest_flags;
cache->cache[0].fast_path.func = *out_func;
}
return TRUE;
}
static pixman_bool_t
compute_sample_extents (pixman_transform_t *transform,
pixman_box32_t *extents, int x, int y,
pixman_fixed_t x_off, pixman_fixed_t y_off,
pixman_fixed_t width, pixman_fixed_t height)
{
pixman_fixed_t x1, y1, x2, y2;
pixman_fixed_48_16_t tx1, ty1, tx2, ty2;
/* We have checked earlier that (extents->x1 - x) etc. fit in a pixman_fixed_t */
x1 = (pixman_fixed_48_16_t)pixman_int_to_fixed (extents->x1 - x) + pixman_fixed_1 / 2;
y1 = (pixman_fixed_48_16_t)pixman_int_to_fixed (extents->y1 - y) + pixman_fixed_1 / 2;
x2 = (pixman_fixed_48_16_t)pixman_int_to_fixed (extents->x2 - x) - pixman_fixed_1 / 2;
y2 = (pixman_fixed_48_16_t)pixman_int_to_fixed (extents->y2 - y) - pixman_fixed_1 / 2;
if (!transform)
{
tx1 = (pixman_fixed_48_16_t)x1;
ty1 = (pixman_fixed_48_16_t)y1;
tx2 = (pixman_fixed_48_16_t)x2;
ty2 = (pixman_fixed_48_16_t)y2;
}
else
{
int i;
/* Silence GCC */
tx1 = ty1 = tx2 = ty2 = 0;
for (i = 0; i < 4; ++i)
{
pixman_fixed_48_16_t tx, ty;
pixman_vector_t v;
v.vector[0] = (i & 0x01)? x1 : x2;
v.vector[1] = (i & 0x02)? y1 : y2;
v.vector[2] = pixman_fixed_1;
if (!pixman_transform_point (transform, &v))
return FALSE;
tx = (pixman_fixed_48_16_t)v.vector[0];
ty = (pixman_fixed_48_16_t)v.vector[1];
if (i == 0)
{
tx1 = tx;
ty1 = ty;
tx2 = tx;
ty2 = ty;
}
else
{
if (tx < tx1)
tx1 = tx;
if (ty < ty1)
ty1 = ty;
if (tx > tx2)
tx2 = tx;
if (ty > ty2)
ty2 = ty;
}
}
}
/* Expand the source area by a tiny bit so account of different rounding that
* may happen during sampling. Note that (8 * pixman_fixed_e) is very far from
* 0.5 so this won't cause the area computed to be overly pessimistic.
*/
tx1 += x_off - 8 * pixman_fixed_e;
ty1 += y_off - 8 * pixman_fixed_e;
tx2 += x_off + width + 8 * pixman_fixed_e;
ty2 += y_off + height + 8 * pixman_fixed_e;
if (tx1 < pixman_min_fixed_48_16 || tx1 > pixman_max_fixed_48_16 ||
ty1 < pixman_min_fixed_48_16 || ty1 > pixman_max_fixed_48_16 ||
tx2 < pixman_min_fixed_48_16 || tx2 > pixman_max_fixed_48_16 ||
ty2 < pixman_min_fixed_48_16 || ty2 > pixman_max_fixed_48_16)
{
return FALSE;
}
else
{
extents->x1 = pixman_fixed_to_int (tx1);
extents->y1 = pixman_fixed_to_int (ty1);
extents->x2 = pixman_fixed_to_int (tx2) + 1;
extents->y2 = pixman_fixed_to_int (ty2) + 1;
return TRUE;
}
}
#define IS_16BIT(x) (((x) >= INT16_MIN) && ((x) <= INT16_MAX))
static pixman_bool_t
analyze_extent (pixman_image_t *image, int x, int y,
const pixman_box32_t *extents, uint32_t *flags)
{
pixman_transform_t *transform;
pixman_fixed_t *params;
pixman_fixed_t x_off, y_off;
pixman_fixed_t width, height;
pixman_box32_t ex;
if (!image)
return TRUE;
/* Some compositing functions walk one step
* outside the destination rectangle, so we
* check here that the expanded-by-one source
* extents in destination space fits in 16 bits
*/
if (!IS_16BIT (extents->x1 - x - 1) ||
!IS_16BIT (extents->y1 - y - 1) ||
!IS_16BIT (extents->x2 - x + 1) ||
!IS_16BIT (extents->y2 - y + 1))
{
return FALSE;
}
transform = image->common.transform;
if (image->common.type == BITS)
{
/* During repeat mode calculations we might convert the
* width/height of an image to fixed 16.16, so we need
* them to be smaller than 16 bits.
*/
if (image->bits.width >= 0x7fff || image->bits.height >= 0x7fff)
return FALSE;
#define ID_AND_NEAREST (FAST_PATH_ID_TRANSFORM | FAST_PATH_NEAREST_FILTER)
if ((image->common.flags & ID_AND_NEAREST) == ID_AND_NEAREST &&
extents->x1 - x >= 0 &&
extents->y1 - y >= 0 &&
extents->x2 - x <= image->bits.width &&
extents->y2 - y <= image->bits.height)
{
*flags |= FAST_PATH_SAMPLES_COVER_CLIP;
return TRUE;
}
switch (image->common.filter)
{
case PIXMAN_FILTER_CONVOLUTION:
params = image->common.filter_params;
x_off = - pixman_fixed_e - ((params[0] - pixman_fixed_1) >> 1);
y_off = - pixman_fixed_e - ((params[1] - pixman_fixed_1) >> 1);
width = params[0];
height = params[1];
break;
case PIXMAN_FILTER_GOOD:
case PIXMAN_FILTER_BEST:
case PIXMAN_FILTER_BILINEAR:
x_off = - pixman_fixed_1 / 2;
y_off = - pixman_fixed_1 / 2;
width = pixman_fixed_1;
height = pixman_fixed_1;
break;
case PIXMAN_FILTER_FAST:
case PIXMAN_FILTER_NEAREST:
x_off = - pixman_fixed_e;
y_off = - pixman_fixed_e;
width = 0;
height = 0;
break;
default:
return FALSE;
}
/* Check whether the non-expanded, transformed extent is entirely within
* the source image, and set the FAST_PATH_SAMPLES_COVER_CLIP if it is.
*/
ex = *extents;
if (compute_sample_extents (transform, &ex, x, y, x_off, y_off, width, height) &&
ex.x1 >= 0 && ex.y1 >= 0 &&
ex.x2 <= image->bits.width && ex.y2 <= image->bits.height)
{
*flags |= FAST_PATH_SAMPLES_COVER_CLIP;
}
}
else
{
x_off = 0;
y_off = 0;
width = 0;
height = 0;
}
/* Check that the extents expanded by one don't overflow. This ensures that
* compositing functions can simply walk the source space using 16.16
* variables without worrying about overflow.
*/
ex.x1 = extents->x1 - 1;
ex.y1 = extents->y1 - 1;
ex.x2 = extents->x2 + 1;
ex.y2 = extents->y2 + 1;
if (!compute_sample_extents (transform, &ex, x, y, x_off, y_off, width, height))
return FALSE;
return TRUE;
}
/*
* Work around GCC bug causing crashes in Mozilla with SSE2
*
* When using -msse, gcc generates movdqa instructions assuming that
* the stack is 16 byte aligned. Unfortunately some applications, such
* as Mozilla and Mono, end up aligning the stack to 4 bytes, which
* causes the movdqa instructions to fail.
*
* The __force_align_arg_pointer__ makes gcc generate a prologue that
* realigns the stack pointer to 16 bytes.
*
* On x86-64 this is not necessary because the standard ABI already
* calls for a 16 byte aligned stack.
*
* See https://bugs.freedesktop.org/show_bug.cgi?id=15693
*/
#if defined (USE_SSE2) && defined(__GNUC__) && !defined(__x86_64__) && !defined(__amd64__)
__attribute__((__force_align_arg_pointer__))
#endif
PIXMAN_EXPORT void
pixman_image_composite32 (pixman_op_t op,
pixman_image_t * src,
pixman_image_t * mask,
pixman_image_t * dest,
int32_t src_x,
int32_t src_y,
int32_t mask_x,
int32_t mask_y,
int32_t dest_x,
int32_t dest_y,
int32_t width,
int32_t height)
{
pixman_format_code_t src_format, mask_format, dest_format;
uint32_t src_flags, mask_flags, dest_flags;
pixman_region32_t region;
pixman_box32_t *extents;
uint32_t *src_bits;
int src_dx, src_dy;
uint32_t *mask_bits;
int mask_dx, mask_dy;
uint32_t *dest_bits;
int dest_dx, dest_dy;
pixman_bool_t need_workaround;
pixman_implementation_t *imp;
pixman_composite_func_t func;
_pixman_image_validate (src);
if (mask)
_pixman_image_validate (mask);
_pixman_image_validate (dest);
src_format = src->common.extended_format_code;
src_flags = src->common.flags;
if (mask)
{
mask_format = mask->common.extended_format_code;
mask_flags = mask->common.flags;
}
else
{
mask_format = PIXMAN_null;
mask_flags = FAST_PATH_IS_OPAQUE;
}
dest_format = dest->common.extended_format_code;
dest_flags = dest->common.flags;
/* Check for pixbufs */
if ((mask_format == PIXMAN_a8r8g8b8 || mask_format == PIXMAN_a8b8g8r8) &&
(src->type == BITS && src->bits.bits == mask->bits.bits) &&
(src->common.repeat == mask->common.repeat) &&
(src_x == mask_x && src_y == mask_y))
{
if (src_format == PIXMAN_x8b8g8r8)
src_format = mask_format = PIXMAN_pixbuf;
else if (src_format == PIXMAN_x8r8g8b8)
src_format = mask_format = PIXMAN_rpixbuf;
}
/* Check for workaround */
need_workaround = (src_flags | mask_flags | dest_flags) & FAST_PATH_NEEDS_WORKAROUND;
if (need_workaround)
{
apply_workaround (src, &src_x, &src_y, &src_bits, &src_dx, &src_dy);
apply_workaround (mask, &mask_x, &mask_y, &mask_bits, &mask_dx, &mask_dy);
apply_workaround (dest, &dest_x, &dest_y, &dest_bits, &dest_dx, &dest_dy);
}
pixman_region32_init (&region);
if (!pixman_compute_composite_region32 (
&region, src, mask, dest,
src_x, src_y, mask_x, mask_y, dest_x, dest_y, width, height))
{
goto out;
}
extents = pixman_region32_extents (&region);
if (!analyze_extent (src, dest_x - src_x, dest_y - src_y, extents, &src_flags))
goto out;
if (!analyze_extent (mask, dest_x - mask_x, dest_y - mask_y, extents, &mask_flags))
goto out;
/* If the clip is within the source samples, and the samples are opaque,
* then the source is effectively opaque.
*/
#define BOTH (FAST_PATH_SAMPLES_OPAQUE | FAST_PATH_SAMPLES_COVER_CLIP)
if ((src_flags & BOTH) == BOTH)
src_flags |= FAST_PATH_IS_OPAQUE;
if ((mask_flags & BOTH) == BOTH)
mask_flags |= FAST_PATH_IS_OPAQUE;
/*
* Check if we can replace our operator by a simpler one
* if the src or dest are opaque. The output operator should be
* mathematically equivalent to the source.
*/
op = optimize_operator (op, src_flags, mask_flags, dest_flags);
if (op == PIXMAN_OP_DST)
goto out;
if (lookup_composite_function (op,
src_format, src_flags,
mask_format, mask_flags,
dest_format, dest_flags,
&imp, &func))
{
const pixman_box32_t *pbox;
int n;
pbox = pixman_region32_rectangles (&region, &n);
while (n--)
{
func (imp, op,
src, mask, dest,
pbox->x1 + src_x - dest_x,
pbox->y1 + src_y - dest_y,
pbox->x1 + mask_x - dest_x,
pbox->y1 + mask_y - dest_y,
pbox->x1,
pbox->y1,
pbox->x2 - pbox->x1,
pbox->y2 - pbox->y1);
pbox++;
}
}
out:
if (need_workaround)
{
unapply_workaround (src, src_bits, src_dx, src_dy);
unapply_workaround (mask, mask_bits, mask_dx, mask_dy);
unapply_workaround (dest, dest_bits, dest_dx, dest_dy);
}
pixman_region32_fini (&region);
}
PIXMAN_EXPORT void
pixman_image_composite (pixman_op_t op,
pixman_image_t * src,
pixman_image_t * mask,
pixman_image_t * dest,
int16_t src_x,
int16_t src_y,
int16_t mask_x,
int16_t mask_y,
int16_t dest_x,
int16_t dest_y,
uint16_t width,
uint16_t height)
{
pixman_image_composite32 (op, src, mask, dest, src_x, src_y,
mask_x, mask_y, dest_x, dest_y, width, height);
}
PIXMAN_EXPORT pixman_bool_t
pixman_blt (uint32_t *src_bits,
uint32_t *dst_bits,
int src_stride,
int dst_stride,
int src_bpp,
int dst_bpp,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height)
{
return _pixman_implementation_blt (get_implementation(),
src_bits, dst_bits, src_stride, dst_stride,
src_bpp, dst_bpp,
src_x, src_y,
dst_x, dst_y,
width, height);
}
PIXMAN_EXPORT pixman_bool_t
pixman_fill (uint32_t *bits,
int stride,
int bpp,
int x,
int y,
int width,
int height,
uint32_t xor)
{
return _pixman_implementation_fill (
get_implementation(), bits, stride, bpp, x, y, width, height, xor);
}
static uint32_t
color_to_uint32 (const pixman_color_t *color)
{
return
(color->alpha >> 8 << 24) |
(color->red >> 8 << 16) |
(color->green & 0xff00) |
(color->blue >> 8);
}
static pixman_bool_t
color_to_pixel (pixman_color_t * color,
uint32_t * pixel,
pixman_format_code_t format)
{
uint32_t c = color_to_uint32 (color);
if (!(format == PIXMAN_a8r8g8b8 ||
format == PIXMAN_x8r8g8b8 ||
format == PIXMAN_a8b8g8r8 ||
format == PIXMAN_x8b8g8r8 ||
format == PIXMAN_b8g8r8a8 ||
format == PIXMAN_b8g8r8x8 ||
format == PIXMAN_r5g6b5 ||
format == PIXMAN_b5g6r5 ||
format == PIXMAN_a8))
{
return FALSE;
}
if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_ABGR)
{
c = ((c & 0xff000000) >> 0) |
((c & 0x00ff0000) >> 16) |
((c & 0x0000ff00) >> 0) |
((c & 0x000000ff) << 16);
}
if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_BGRA)
{
c = ((c & 0xff000000) >> 24) |
((c & 0x00ff0000) >> 8) |
((c & 0x0000ff00) << 8) |
((c & 0x000000ff) << 24);
}
if (format == PIXMAN_a8)
c = c >> 24;
else if (format == PIXMAN_r5g6b5 ||
format == PIXMAN_b5g6r5)
c = CONVERT_8888_TO_0565 (c);
#if 0
printf ("color: %x %x %x %x\n", color->alpha, color->red, color->green, color->blue);
printf ("pixel: %x\n", c);
#endif
*pixel = c;
return TRUE;
}
PIXMAN_EXPORT pixman_bool_t
pixman_image_fill_rectangles (pixman_op_t op,
pixman_image_t * dest,
pixman_color_t * color,
int n_rects,
const pixman_rectangle16_t *rects)
{
pixman_box32_t stack_boxes[6];
pixman_box32_t *boxes;
pixman_bool_t result;
int i;
if (n_rects > 6)
{
boxes = pixman_malloc_ab (sizeof (pixman_box32_t), n_rects);
if (boxes == NULL)
return FALSE;
}
else
{
boxes = stack_boxes;
}
for (i = 0; i < n_rects; ++i)
{
boxes[i].x1 = rects[i].x;
boxes[i].y1 = rects[i].y;
boxes[i].x2 = boxes[i].x1 + rects[i].width;
boxes[i].y2 = boxes[i].y1 + rects[i].height;
}
result = pixman_image_fill_boxes (op, dest, color, n_rects, boxes);
if (boxes != stack_boxes)
free (boxes);
return result;
}
PIXMAN_EXPORT pixman_bool_t
pixman_image_fill_boxes (pixman_op_t op,
pixman_image_t * dest,
pixman_color_t * color,
int n_boxes,
const pixman_box32_t *boxes)
{
pixman_image_t *solid;
pixman_color_t c;
int i;
_pixman_image_validate (dest);
if (color->alpha == 0xffff)
{
if (op == PIXMAN_OP_OVER)
op = PIXMAN_OP_SRC;
}
if (op == PIXMAN_OP_CLEAR)
{
c.red = 0;
c.green = 0;
c.blue = 0;
c.alpha = 0;
color = &c;
op = PIXMAN_OP_SRC;
}
if (op == PIXMAN_OP_SRC)
{
uint32_t pixel;
if (color_to_pixel (color, &pixel, dest->bits.format))
{
pixman_region32_t fill_region;
int n_rects, j;
pixman_box32_t *rects;
if (!pixman_region32_init_rects (&fill_region, boxes, n_boxes))
return FALSE;
if (dest->common.have_clip_region)
{
if (!pixman_region32_intersect (&fill_region,
&fill_region,
&dest->common.clip_region))
return FALSE;
}
rects = pixman_region32_rectangles (&fill_region, &n_rects);
for (j = 0; j < n_rects; ++j)
{
const pixman_box32_t *rect = &(rects[j]);
pixman_fill (dest->bits.bits, dest->bits.rowstride, PIXMAN_FORMAT_BPP (dest->bits.format),
rect->x1, rect->y1, rect->x2 - rect->x1, rect->y2 - rect->y1,
pixel);
}
pixman_region32_fini (&fill_region);
return TRUE;
}
}
solid = pixman_image_create_solid_fill (color);
if (!solid)
return FALSE;
for (i = 0; i < n_boxes; ++i)
{
const pixman_box32_t *box = &(boxes[i]);
pixman_image_composite32 (op, solid, NULL, dest,
0, 0, 0, 0,
box->x1, box->y1,
box->x2 - box->x1, box->y2 - box->y1);
}
pixman_image_unref (solid);
return TRUE;
}
/**
* pixman_version:
*
* Returns the version of the pixman library encoded in a single
* integer as per %PIXMAN_VERSION_ENCODE. The encoding ensures that
* later versions compare greater than earlier versions.
*
* A run-time comparison to check that pixman's version is greater than
* or equal to version X.Y.Z could be performed as follows:
*
* <informalexample><programlisting>
* if (pixman_version() >= PIXMAN_VERSION_ENCODE(X,Y,Z)) {...}
* </programlisting></informalexample>
*
* See also pixman_version_string() as well as the compile-time
* equivalents %PIXMAN_VERSION and %PIXMAN_VERSION_STRING.
*
* Return value: the encoded version.
**/
PIXMAN_EXPORT int
pixman_version (void)
{
return PIXMAN_VERSION;
}
/**
* pixman_version_string:
*
* Returns the version of the pixman library as a human-readable string
* of the form "X.Y.Z".
*
* See also pixman_version() as well as the compile-time equivalents
* %PIXMAN_VERSION_STRING and %PIXMAN_VERSION.
*
* Return value: a string containing the version.
**/
PIXMAN_EXPORT const char*
pixman_version_string (void)
{
return PIXMAN_VERSION_STRING;
}
/**
* pixman_format_supported_source:
* @format: A pixman_format_code_t format
*
* Return value: whether the provided format code is a supported
* format for a pixman surface used as a source in
* rendering.
*
* Currently, all pixman_format_code_t values are supported.
**/
PIXMAN_EXPORT pixman_bool_t
pixman_format_supported_source (pixman_format_code_t format)
{
switch (format)
{
/* 32 bpp formats */
case PIXMAN_a2b10g10r10:
case PIXMAN_x2b10g10r10:
case PIXMAN_a2r10g10b10:
case PIXMAN_x2r10g10b10:
case PIXMAN_a8r8g8b8:
case PIXMAN_x8r8g8b8:
case PIXMAN_a8b8g8r8:
case PIXMAN_x8b8g8r8:
case PIXMAN_b8g8r8a8:
case PIXMAN_b8g8r8x8:
case PIXMAN_r8g8b8:
case PIXMAN_b8g8r8:
case PIXMAN_r5g6b5:
case PIXMAN_b5g6r5:
case PIXMAN_x14r6g6b6:
/* 16 bpp formats */
case PIXMAN_a1r5g5b5:
case PIXMAN_x1r5g5b5:
case PIXMAN_a1b5g5r5:
case PIXMAN_x1b5g5r5:
case PIXMAN_a4r4g4b4:
case PIXMAN_x4r4g4b4:
case PIXMAN_a4b4g4r4:
case PIXMAN_x4b4g4r4:
/* 8bpp formats */
case PIXMAN_a8:
case PIXMAN_r3g3b2:
case PIXMAN_b2g3r3:
case PIXMAN_a2r2g2b2:
case PIXMAN_a2b2g2r2:
case PIXMAN_c8:
case PIXMAN_g8:
case PIXMAN_x4a4:
/* Collides with PIXMAN_c8
case PIXMAN_x4c4:
*/
/* Collides with PIXMAN_g8
case PIXMAN_x4g4:
*/
/* 4bpp formats */
case PIXMAN_a4:
case PIXMAN_r1g2b1:
case PIXMAN_b1g2r1:
case PIXMAN_a1r1g1b1:
case PIXMAN_a1b1g1r1:
case PIXMAN_c4:
case PIXMAN_g4:
/* 1bpp formats */
case PIXMAN_a1:
case PIXMAN_g1:
/* YUV formats */
case PIXMAN_yuy2:
case PIXMAN_yv12:
return TRUE;
default:
return FALSE;
}
}
/**
* pixman_format_supported_destination:
* @format: A pixman_format_code_t format
*
* Return value: whether the provided format code is a supported
* format for a pixman surface used as a destination in
* rendering.
*
* Currently, all pixman_format_code_t values are supported
* except for the YUV formats.
**/
PIXMAN_EXPORT pixman_bool_t
pixman_format_supported_destination (pixman_format_code_t format)
{
/* YUV formats cannot be written to at the moment */
if (format == PIXMAN_yuy2 || format == PIXMAN_yv12)
return FALSE;
return pixman_format_supported_source (format);
}
PIXMAN_EXPORT pixman_bool_t
pixman_compute_composite_region (pixman_region16_t * region,
pixman_image_t * src_image,
pixman_image_t * mask_image,
pixman_image_t * dst_image,
int16_t src_x,
int16_t src_y,
int16_t mask_x,
int16_t mask_y,
int16_t dest_x,
int16_t dest_y,
uint16_t width,
uint16_t height)
{
pixman_region32_t r32;
pixman_bool_t retval;
pixman_region32_init (&r32);
retval = pixman_compute_composite_region32 (
&r32, src_image, mask_image, dst_image,
src_x, src_y, mask_x, mask_y, dest_x, dest_y,
width, height);
if (retval)
{
if (!pixman_region16_copy_from_region32 (region, &r32))
retval = FALSE;
}
pixman_region32_fini (&r32);
return retval;
}
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