pixman_image_t * FbCreateAlphaPicture (pixman_image_t *dst, pixman_format_t *format, uint16_t width, uint16_t height) { pixman_image_t *image; int own_format = 0; if (width > 32767 || height > 32767) return NULL; if (!format) { own_format = 1; if (dst->polyEdge == PolyEdgeSharp) format = pixman_format_create (PIXMAN_FORMAT_NAME_A1); else format = pixman_format_create (PIXMAN_FORMAT_NAME_A8); if (!format) return NULL; } image = pixman_image_create (format, width, height); if (own_format) pixman_format_destroy (format); /* XXX: Is this a reasonable way to clear the image? Would probably be preferable to use pixman_image_fill_rectangle once such a beast exists. */ memset (image->pixels->data, 0, height * image->pixels->stride); return image; }
/** * cairo_image_surface_create: * @format: format of pixels in the surface to create * @width: width of the surface, in pixels * @height: height of the surface, in pixels * * Creates an image surface of the specified format and * dimensions. The initial contents of the surface is undefined; you * must explicitly initialize the surface contents, using, for * example, cairo_paint(). * * Return value: a pointer to the newly created surface. The caller * owns the surface and should call cairo_surface_destroy when done * with it. * * This function always returns a valid pointer, but it will return a * pointer to a "nil" surface if an error such as out of memory * occurs. You can use cairo_surface_status() to check for this. **/ cairo_surface_t * cairo_image_surface_create (cairo_format_t format, int width, int height) { cairo_surface_t *surface; pixman_format_t *pixman_format; pixman_image_t *pixman_image; if (! CAIRO_FORMAT_VALID (format)) return (cairo_surface_t*) &_cairo_surface_nil; pixman_format = _create_pixman_format (format); if (pixman_format == NULL) { _cairo_error (CAIRO_STATUS_NO_MEMORY); return (cairo_surface_t*) &_cairo_surface_nil; } pixman_image = pixman_image_create (pixman_format, width, height); pixman_format_destroy (pixman_format); if (pixman_image == NULL) { _cairo_error (CAIRO_STATUS_NO_MEMORY); return (cairo_surface_t*) &_cairo_surface_nil; } surface = _cairo_image_surface_create_for_pixman_image (pixman_image, format); return surface; }
cairo_surface_t * _cairo_image_surface_create_with_masks (unsigned char *data, cairo_format_masks_t *format, int width, int height, int stride) { cairo_surface_t *surface; pixman_format_t *pixman_format; pixman_image_t *pixman_image; cairo_format_t cairo_format; pixman_format = pixman_format_create_masks (format->bpp, format->alpha_mask, format->red_mask, format->green_mask, format->blue_mask); if (pixman_format == NULL) { _cairo_error (CAIRO_STATUS_NO_MEMORY); return (cairo_surface_t*) &_cairo_surface_nil; } cairo_format = _cairo_format_from_pixman_format (pixman_format); pixman_image = pixman_image_create_for_data ((pixman_bits_t *) data, pixman_format, width, height, format->bpp, stride); pixman_format_destroy (pixman_format); if (pixman_image == NULL) { _cairo_error (CAIRO_STATUS_NO_MEMORY); return (cairo_surface_t*) &_cairo_surface_nil; } surface = _cairo_image_surface_create_for_pixman_image (pixman_image, cairo_format); return surface; }
/** * cairo_image_surface_create_for_data: * @data: a pointer to a buffer supplied by the application * in which to write contents. * @format: the format of pixels in the buffer * @width: the width of the image to be stored in the buffer * @height: the height of the image to be stored in the buffer * @stride: the number of bytes between the start of rows * in the buffer. Having this be specified separate from @width * allows for padding at the end of rows, or for writing * to a subportion of a larger image. * * Creates an image surface for the provided pixel data. The output * buffer must be kept around until the #cairo_surface_t is destroyed * or cairo_surface_finish() is called on the surface. The initial * contents of @buffer will be used as the inital image contents; you * must explicitely clear the buffer, using, for example, * cairo_rectangle() and cairo_fill() if you want it cleared. * * Return value: a pointer to the newly created surface. The caller * owns the surface and should call cairo_surface_destroy when done * with it. * * This function always returns a valid pointer, but it will return a * pointer to a "nil" surface if an error such as out of memory * occurs. You can use cairo_surface_status() to check for this. **/ cairo_surface_t * cairo_image_surface_create_for_data (unsigned char *data, cairo_format_t format, int width, int height, int stride) { cairo_surface_t *surface; pixman_format_t *pixman_format; pixman_image_t *pixman_image; if (! CAIRO_FORMAT_VALID (format)) return (cairo_surface_t*) &_cairo_surface_nil; pixman_format = _create_pixman_format (format); if (pixman_format == NULL) { _cairo_error (CAIRO_STATUS_NO_MEMORY); return (cairo_surface_t*) &_cairo_surface_nil; } pixman_image = pixman_image_create_for_data ((pixman_bits_t *) data, pixman_format, width, height, _cairo_format_bpp (format), stride); pixman_format_destroy (pixman_format); if (pixman_image == NULL) { _cairo_error (CAIRO_STATUS_NO_MEMORY); return (cairo_surface_t*) &_cairo_surface_nil; } surface = _cairo_image_surface_create_for_pixman_image (pixman_image, format); return surface; }
/* XXX: There are failure cases in this function. Don't we need to * propagate the errors out? */ void pixman_composite_trapezoids (pixman_operator_t op, pixman_image_t *src, pixman_image_t *dst, int xSrc, int ySrc, const pixman_trapezoid_t *traps, int ntraps) { pixman_image_t *image = NULL; pixman_box16_t traps_bounds, dst_bounds, bounds; pixman_region16_t *traps_region, *dst_region; int16_t xDst, yDst; int16_t xRel, yRel; pixman_format_t *format; if (ntraps == 0) return; /* * Check for solid alpha add */ if (op == PIXMAN_OPERATOR_ADD && miIsSolidAlpha (src)) { for (; ntraps; ntraps--, traps++) fbRasterizeTrapezoid (dst, traps, 0, 0); return; } xDst = traps[0].left.p1.x >> 16; yDst = traps[0].left.p1.y >> 16; pixman_trapezoid_bounds (ntraps, traps, &traps_bounds); traps_region = pixman_region_create_simple (&traps_bounds); /* XXX: If the image has a clip region set, we should really be * fetching it here instead, but it looks like we don't yet expose * a pixman_image_get_clip_region function. */ dst_bounds.x1 = 0; dst_bounds.y1 = 0; dst_bounds.x2 = pixman_image_get_width (dst); dst_bounds.y2 = pixman_image_get_height (dst); dst_region = pixman_region_create_simple (&dst_bounds); pixman_region_intersect (traps_region, traps_region, dst_region); bounds = *(pixman_region_extents (traps_region)); pixman_region_destroy (traps_region); pixman_region_destroy (dst_region); if (bounds.y1 >= bounds.y2 || bounds.x1 >= bounds.x2) return; format = pixman_format_create (PIXMAN_FORMAT_NAME_A8); if (!format) return; image = FbCreateAlphaPicture (dst, format, bounds.x2 - bounds.x1, bounds.y2 - bounds.y1); if (!image) { pixman_format_destroy (format); return; } for (; ntraps; ntraps--, traps++) { if (!xTrapezoidValid(traps)) continue; fbRasterizeTrapezoid (image, traps, -bounds.x1, -bounds.y1); } xRel = bounds.x1 + xSrc - xDst; yRel = bounds.y1 + ySrc - yDst; pixman_composite (op, src, image, dst, xRel, yRel, 0, 0, bounds.x1, bounds.y1, bounds.x2 - bounds.x1, bounds.y2 - bounds.y1); pixman_image_destroy (image); pixman_format_destroy (format); }
static cairo_int_status_t _cairo_image_surface_composite_trapezoids (cairo_operator_t op, cairo_pattern_t *pattern, void *abstract_dst, cairo_antialias_t antialias, int src_x, int src_y, int dst_x, int dst_y, unsigned int width, unsigned int height, cairo_trapezoid_t *traps, int num_traps) { cairo_surface_attributes_t attributes; cairo_image_surface_t *dst = abstract_dst; cairo_image_surface_t *src; cairo_int_status_t status; pixman_image_t *mask; pixman_format_t *format; pixman_bits_t *mask_data; int mask_stride; int mask_bpp; /* Special case adding trapezoids onto a mask surface; we want to avoid * creating an intermediate temporary mask unecessarily. * * We make the assumption here that the portion of the trapezoids * contained within the surface is bounded by [dst_x,dst_y,width,height]; * the Cairo core code passes bounds based on the trapezoid extents. * * Currently the check surface->has_clip is needed for correct * functioning, since pixman_add_trapezoids() doesn't obey the * surface clip, which is a libpixman bug , but there's no harm in * falling through to the general case when the surface is clipped * since libpixman would have to generate an intermediate mask anyways. */ if (op == CAIRO_OPERATOR_ADD && _cairo_pattern_is_opaque_solid (pattern) && _cairo_image_surface_is_alpha_only (dst) && !dst->has_clip && antialias != CAIRO_ANTIALIAS_NONE) { pixman_add_trapezoids (dst->pixman_image, 0, 0, (pixman_trapezoid_t *) traps, num_traps); return CAIRO_STATUS_SUCCESS; } status = _cairo_pattern_acquire_surface (pattern, &dst->base, src_x, src_y, width, height, (cairo_surface_t **) &src, &attributes); if (status) return status; status = _cairo_image_surface_set_attributes (src, &attributes); if (status) goto CLEANUP_SOURCE; switch (antialias) { case CAIRO_ANTIALIAS_NONE: format = pixman_format_create (PIXMAN_FORMAT_NAME_A1); mask_stride = (width + 31)/8; mask_bpp = 1; break; default: format = pixman_format_create (PIXMAN_FORMAT_NAME_A8); mask_stride = (width + 3) & ~3; mask_bpp = 8; break; } if (!format) { status = CAIRO_STATUS_NO_MEMORY; goto CLEANUP_SOURCE; } /* The image must be initially transparent */ mask_data = calloc (1, mask_stride * height); if (!mask_data) { status = CAIRO_STATUS_NO_MEMORY; pixman_format_destroy (format); goto CLEANUP_SOURCE; } mask = pixman_image_create_for_data (mask_data, format, width, height, mask_bpp, mask_stride); pixman_format_destroy (format); if (!mask) { status = CAIRO_STATUS_NO_MEMORY; goto CLEANUP_IMAGE_DATA; } /* XXX: The pixman_trapezoid_t cast is evil and needs to go away * somehow. */ pixman_add_trapezoids (mask, - dst_x, - dst_y, (pixman_trapezoid_t *) traps, num_traps); pixman_composite (_pixman_operator (op), src->pixman_image, mask, dst->pixman_image, src_x + attributes.x_offset, src_y + attributes.y_offset, 0, 0, dst_x, dst_y, width, height); if (!_cairo_operator_bounded_by_mask (op)) status = _cairo_surface_composite_shape_fixup_unbounded (&dst->base, &attributes, src->width, src->height, width, height, src_x, src_y, 0, 0, dst_x, dst_y, width, height); pixman_image_destroy (mask); CLEANUP_IMAGE_DATA: free (mask_data); CLEANUP_SOURCE: _cairo_pattern_release_surface (pattern, &src->base, &attributes); return status; }