switch to tinyobj and nanovg from assimp and cairo

1 files changed, 0 insertions, 1133 deletions

diff --git a/libs/pixman-0.40.0/pixman/pixman.c b/libs/pixman-0.40.0/pixman/pixman.c
deleted file mode 100644
index c09b528..0000000
--- a/libs/pixman-0.40.0/pixman/pixman.c
+++ /dev/null
@@ -1,1133 +0,0 @@
-/* -*- 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 box_48_16 box_48_16_t;
-
-struct box_48_16
-{
-    pixman_fixed_48_16_t        x1;
-    pixman_fixed_48_16_t        y1;
-    pixman_fixed_48_16_t        x2;
-    pixman_fixed_48_16_t        y2;
-};
-
-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;
-
-    if (image->common.type == BITS)
-    {
-	if (pixman_fixed_to_int (transformed.x1 - pixman_fixed_e) >= 0                &&
-	    pixman_fixed_to_int (transformed.y1 - pixman_fixed_e) >= 0                &&
-	    pixman_fixed_to_int (transformed.x2 - pixman_fixed_e) < image->bits.width &&
-	    pixman_fixed_to_int (transformed.y2 - pixman_fixed_e) < 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 | FAST_PATH_NO_ALPHA_MAP;
-    }
-
-    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 (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_RGBA_FLOAT)
-    {
-	return FALSE;
-    }
-
-    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, 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;
-}