The Tor Browser: gfx/cairo/libpixman/src/pixman.c@6474c204b198 (annotated)

gfx/cairo/libpixman/src/pixman.c@6474c204b198 (annotated)

gfx/cairo/libpixman/src/pixman.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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>
 pixman_implementation_t *global_implementation;
 #ifdef TOOLCHAIN_SUPPORTS_ATTRIBUTE_CONSTRUCTOR
 static void __attribute__((constructor))
 pixman_constructor (void)
 {
     global_implementation = _pixman_choose_implementation ();
 }
 #endif
 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];
 }
 /*
  * 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.
  */
 pixman_bool_t
 _pixman_compute_composite_region32 (pixman_region32_t * region,
 				    pixman_image_t *    src_image,
 				    pixman_image_t *    mask_image,
 				    pixman_image_t *    dest_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, dest_image->bits.width);
     region->extents.y2 = MIN (region->extents.y2, dest_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 (dest_image->common.have_clip_region)
     {
 	if (!clip_general_image (region, &dest_image->common.clip_region, 0, 0))
 	    return FALSE;
     }
     if (dest_image->common.alpha_map)
     {
 	if (!pixman_region32_intersect_rect (region, region,
 					     dest_image->common.alpha_origin_x,
 					     dest_image->common.alpha_origin_y,
 					     dest_image->common.alpha_map->width,
 					     dest_image->common.alpha_map->height))
 	{
 	    return FALSE;
 	}
 	if (!pixman_region32_not_empty (region))
 	    return FALSE;
 	if (dest_image->common.alpha_map->common.have_clip_region)
 	{
 	    if (!clip_general_image (region, &dest_image->common.alpha_map->common.clip_region,
 				     -dest_image->common.alpha_origin_x,
 				     -dest_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;
 }
 typedef struct
 {
     pixman_fixed_48_16_t	x1;
     pixman_fixed_48_16_t	y1;
     pixman_fixed_48_16_t	x2;
     pixman_fixed_48_16_t	y2;
 } box_48_16_t;
 static pixman_bool_t
 compute_transformed_extents (pixman_transform_t *transform,
 			     const pixman_box32_t *extents,
 			     box_48_16_t *transformed)
 {
     pixman_fixed_48_16_t tx1, ty1, tx2, ty2;
     pixman_fixed_t x1, y1, x2, y2;
     int i;
     x1 = pixman_int_to_fixed (extents->x1) + pixman_fixed_1 / 2;
     y1 = pixman_int_to_fixed (extents->y1) + pixman_fixed_1 / 2;
     x2 = pixman_int_to_fixed (extents->x2) - pixman_fixed_1 / 2;
     y2 = pixman_int_to_fixed (extents->y2) - pixman_fixed_1 / 2;
     if (!transform)
     {
 	transformed->x1 = x1;
 	transformed->y1 = y1;
 	transformed->x2 = x2;
 	transformed->y2 = y2;
 	return TRUE;
     }
     tx1 = ty1 = INT64_MAX;
     tx2 = ty2 = INT64_MIN;
     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 (tx < tx1)
 	    tx1 = tx;
 	if (ty < ty1)
 	    ty1 = ty;
 	if (tx > tx2)
 	    tx2 = tx;
 	if (ty > ty2)
 	    ty2 = ty;
     }
     transformed->x1 = tx1;
     transformed->y1 = ty1;
     transformed->x2 = tx2;
     transformed->y2 = ty2;
     return TRUE;
 }
 #define IS_16BIT(x) (((x) >= INT16_MIN) && ((x) <= INT16_MAX))
 #define ABS(f)      (((f) < 0)?  (-(f)) : (f))
 #define IS_16_16(f) (((f) >= pixman_min_fixed_48_16 && ((f) <= pixman_max_fixed_48_16)))
 static pixman_bool_t
 analyze_extent (pixman_image_t       *image,
 		const pixman_box32_t *extents,
 		uint32_t             *flags)
 {
     pixman_transform_t *transform;
     pixman_fixed_t x_off, y_off;
     pixman_fixed_t width, height;
     pixman_fixed_t *params;
     box_48_16_t transformed;
     pixman_box32_t exp_extents;
     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 - 1)		||
 	!IS_16BIT (extents->y1 - 1)		||
 	!IS_16BIT (extents->x2 + 1)		||
 	!IS_16BIT (extents->y2 + 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;
 	if ((image->common.flags & FAST_PATH_ID_TRANSFORM) == FAST_PATH_ID_TRANSFORM &&
 	    extents->x1 >= 0 &&
 	    extents->y1 >= 0 &&
 	    extents->x2 <= image->bits.width &&
 	    extents->y2 <= image->bits.height)
 	{
 	    *flags |= FAST_PATH_SAMPLES_COVER_CLIP_NEAREST;
 	    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_SEPARABLE_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;
 	}
     }
     else
     {
 	x_off = 0;
 	y_off = 0;
 	width = 0;
 	height = 0;
     }
     if (!compute_transformed_extents (transform, extents, &transformed))
 	return FALSE;
     /* 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.
      */
     transformed.x1 -= 8 * pixman_fixed_e;
     transformed.y1 -= 8 * pixman_fixed_e;
     transformed.x2 += 8 * pixman_fixed_e;
     transformed.y2 += 8 * pixman_fixed_e;
     if (image->common.type == BITS)
     {
 	if (pixman_fixed_to_int (transformed.x1) >= 0			&&
 	    pixman_fixed_to_int (transformed.y1) >= 0			&&
 	    pixman_fixed_to_int (transformed.x2) < image->bits.width	&&
 	    pixman_fixed_to_int (transformed.y2) < image->bits.height)
 	{
 	    *flags |= FAST_PATH_SAMPLES_COVER_CLIP_NEAREST;
 	}
 	if (pixman_fixed_to_int (transformed.x1 - pixman_fixed_1 / 2) >= 0		  &&
 	    pixman_fixed_to_int (transformed.y1 - pixman_fixed_1 / 2) >= 0		  &&
 	    pixman_fixed_to_int (transformed.x2 + pixman_fixed_1 / 2) < image->bits.width &&
 	    pixman_fixed_to_int (transformed.y2 + pixman_fixed_1 / 2) < image->bits.height)
 	{
 	    *flags |= FAST_PATH_SAMPLES_COVER_CLIP_BILINEAR;
 	}
     }
     /* Check we don't overflow when the destination extents are expanded by one.
      * This ensures that compositing functions can simply walk the source space
      * using 16.16 variables without worrying about overflow.
      */
     exp_extents = *extents;
     exp_extents.x1 -= 1;
     exp_extents.y1 -= 1;
     exp_extents.x2 += 1;
     exp_extents.y2 += 1;
     if (!compute_transformed_extents (transform, &exp_extents, &transformed))
 	return FALSE;
     if (!IS_16_16 (transformed.x1 + x_off - 8 * pixman_fixed_e)	||
 	!IS_16_16 (transformed.y1 + y_off - 8 * pixman_fixed_e)	||
 	!IS_16_16 (transformed.x2 + x_off + 8 * pixman_fixed_e + width)	||
 	!IS_16_16 (transformed.y2 + y_off + 8 * pixman_fixed_e + 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;
     pixman_region32_t region;
     pixman_box32_t extents;
     pixman_implementation_t *imp;
     pixman_composite_func_t func;
     pixman_composite_info_t info;
     const pixman_box32_t *pbox;
     int n;
     _pixman_image_validate (src);
     if (mask)
 	_pixman_image_validate (mask);
     _pixman_image_validate (dest);
     src_format = src->common.extended_format_code;
     info.src_flags = src->common.flags;
     if (mask && !(mask->common.flags & FAST_PATH_IS_OPAQUE))
     {
 	mask_format = mask->common.extended_format_code;
 	info.mask_flags = mask->common.flags;
     }
     else
     {
 	mask_format = PIXMAN_null;
 	info.mask_flags = FAST_PATH_IS_OPAQUE;
     }
     dest_format = dest->common.extended_format_code;
     info.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)			   &&
 	(info.src_flags & info.mask_flags & FAST_PATH_ID_TRANSFORM)	   &&
 	(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;
     }
     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);
     extents.x1 -= dest_x - src_x;
     extents.y1 -= dest_y - src_y;
     extents.x2 -= dest_x - src_x;
     extents.y2 -= dest_y - src_y;
     if (!analyze_extent (src, &extents, &info.src_flags))
 	goto out;
     extents.x1 -= src_x - mask_x;
     extents.y1 -= src_y - mask_y;
     extents.x2 -= src_x - mask_x;
     extents.y2 -= src_y - mask_y;
     if (!analyze_extent (mask, &extents, &info.mask_flags))
 	goto out;
     /* If the clip is within the source samples, and the samples are
      * opaque, then the source is effectively opaque.
      */
 #define NEAREST_OPAQUE	(FAST_PATH_SAMPLES_OPAQUE |			\
 			 FAST_PATH_NEAREST_FILTER |			\
 			 FAST_PATH_SAMPLES_COVER_CLIP_NEAREST)
 #define BILINEAR_OPAQUE	(FAST_PATH_SAMPLES_OPAQUE |			\
 			 FAST_PATH_BILINEAR_FILTER |			\
 			 FAST_PATH_SAMPLES_COVER_CLIP_BILINEAR)
     if ((info.src_flags & NEAREST_OPAQUE) == NEAREST_OPAQUE ||
 	(info.src_flags & BILINEAR_OPAQUE) == BILINEAR_OPAQUE)
     {
 	info.src_flags |= FAST_PATH_IS_OPAQUE;
     }
     if ((info.mask_flags & NEAREST_OPAQUE) == NEAREST_OPAQUE ||
 	(info.mask_flags & BILINEAR_OPAQUE) == BILINEAR_OPAQUE)
     {
 	info.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.
      */
     info.op = optimize_operator (op, info.src_flags, info.mask_flags, info.dest_flags);
     _pixman_implementation_lookup_composite (
 	get_implementation (), info.op,
 	src_format, info.src_flags,
 	mask_format, info.mask_flags,
 	dest_format, info.dest_flags,
 	&imp, &func);
     info.src_image = src;
     info.mask_image = mask;
     info.dest_image = dest;
     pbox = pixman_region32_rectangles (&region, &n);
     while (n--)
     {
 	info.src_x = pbox->x1 + src_x - dest_x;
 	info.src_y = pbox->y1 + src_y - dest_y;
 	info.mask_x = pbox->x1 + mask_x - dest_x;
 	info.mask_y = pbox->y1 + mask_y - dest_y;
 	info.dest_x = pbox->x1;
 	info.dest_y = pbox->y1;
 	info.width = pbox->x2 - pbox->x1;
 	info.height = pbox->y2 - pbox->y1;
 	func (imp, &info);
 	pbox++;
     }
 out:
     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       dest_x,
             int       dest_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,
                                        dest_x, dest_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  filler)
 {
     return _pixman_implementation_fill (
 	get_implementation(), bits, stride, bpp, x, y, width, height, filler);
 }
 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 (const 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_r8g8b8a8     ||
           format == PIXMAN_r8g8b8x8     ||
           format == PIXMAN_r5g6b5       ||
           format == PIXMAN_b5g6r5       ||
           format == PIXMAN_a8           ||
           format == PIXMAN_a1))
     {
 	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 (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_RGBA)
 	c = ((c & 0xff000000) >> 24) | (c << 8);
     if (format == PIXMAN_a1)
 	c = c >> 31;
     else 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,
 			      const 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,
                          const 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,
                                   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_a8r8g8b8_sRGB:
     case PIXMAN_x8r8g8b8:
     case PIXMAN_a8b8g8r8:
     case PIXMAN_x8b8g8r8:
     case PIXMAN_b8g8r8a8:
     case PIXMAN_b8g8r8x8:
     case PIXMAN_r8g8b8a8:
     case PIXMAN_r8g8b8x8:
     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 *    dest_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, dest_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;
 }

The Tor Browser / annotate

gfx/cairo/libpixman/src/pixman.c@6474c204b198 (annotated)

gfx/cairo/libpixman/src/pixman.c