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cairo-svg-surface.c
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/* vim: set sw=4 sts=4: -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2004 Red Hat, Inc
* Copyright © 2005-2007 Emmanuel Pacaud <[email protected]>
* Copyright © 2006 Red Hat, Inc
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Kristian Høgsberg <[email protected]>
* Emmanuel Pacaud <[email protected]>
* Carl Worth <[email protected]>
*/
#define _BSD_SOURCE /* for snprintf() */
#include "cairoint.h"
#include "cairo-svg.h"
#include "cairo-array-private.h"
#include "cairo-analysis-surface-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-image-info-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-recording-surface-inline.h"
#include "cairo-output-stream-private.h"
#include "cairo-path-fixed-private.h"
#include "cairo-paginated-private.h"
#include "cairo-scaled-font-subsets-private.h"
#include "cairo-surface-clipper-private.h"
#include "cairo-svg-surface-private.h"
/**
* SECTION:cairo-svg
* @Title: SVG Surfaces
* @Short_Description: Rendering SVG documents
* @See_Also: #cairo_surface_t
*
* The SVG surface is used to render cairo graphics to
* SVG files and is a multi-page vector surface backend.
**/
/**
* CAIRO_HAS_SVG_SURFACE:
*
* Defined if the SVG surface backend is available.
* This macro can be used to conditionally compile backend-specific code.
*
* Since: 1.2
**/
typedef struct cairo_svg_page cairo_svg_page_t;
static const int invalid_pattern_id = -1;
static const cairo_svg_version_t _cairo_svg_versions[] =
{
CAIRO_SVG_VERSION_1_1,
CAIRO_SVG_VERSION_1_2
};
#define CAIRO_SVG_VERSION_LAST ARRAY_LENGTH (_cairo_svg_versions)
static const char *_cairo_svg_supported_mime_types[] =
{
CAIRO_MIME_TYPE_JPEG,
CAIRO_MIME_TYPE_PNG,
CAIRO_MIME_TYPE_URI,
NULL
};
static void
_cairo_svg_surface_emit_path (cairo_output_stream_t *output,
const cairo_path_fixed_t *path,
const cairo_matrix_t *ctm_inverse);
static cairo_bool_t
_cairo_svg_version_has_page_set_support (cairo_svg_version_t version)
{
return version > CAIRO_SVG_VERSION_1_1;
}
static const char * _cairo_svg_version_strings[CAIRO_SVG_VERSION_LAST] =
{
"SVG 1.1",
"SVG 1.2"
};
static const char * _cairo_svg_internal_version_strings[CAIRO_SVG_VERSION_LAST] =
{
"1.1",
"1.2"
};
struct cairo_svg_page {
unsigned int surface_id;
unsigned int clip_level;
cairo_output_stream_t *xml_node;
};
struct cairo_svg_document {
cairo_output_stream_t *output_stream;
unsigned long refcount;
cairo_surface_t *owner;
cairo_bool_t finished;
double width;
double height;
cairo_output_stream_t *xml_node_defs;
cairo_output_stream_t *xml_node_glyphs;
unsigned int linear_pattern_id;
unsigned int radial_pattern_id;
unsigned int pattern_id;
unsigned int filter_id;
unsigned int clip_id;
unsigned int mask_id;
cairo_bool_t alpha_filter;
cairo_svg_version_t svg_version;
cairo_scaled_font_subsets_t *font_subsets;
};
static cairo_status_t
_cairo_svg_document_create (cairo_output_stream_t *stream,
double width,
double height,
cairo_svg_version_t version,
cairo_svg_document_t **document_out);
static cairo_status_t
_cairo_svg_document_destroy (cairo_svg_document_t *document);
static cairo_status_t
_cairo_svg_document_finish (cairo_svg_document_t *document);
static cairo_svg_document_t *
_cairo_svg_document_reference (cairo_svg_document_t *document);
static unsigned int
_cairo_svg_document_allocate_mask_id (cairo_svg_document_t *document);
static cairo_surface_t *
_cairo_svg_surface_create_for_document (cairo_svg_document_t *document,
cairo_content_t content,
double width,
double height);
static cairo_surface_t *
_cairo_svg_surface_create_for_stream_internal (cairo_output_stream_t *stream,
double width,
double height,
cairo_svg_version_t version);
static const cairo_surface_backend_t cairo_svg_surface_backend;
static const cairo_paginated_surface_backend_t cairo_svg_surface_paginated_backend;
/**
* cairo_svg_surface_create_for_stream:
* @write_func: a #cairo_write_func_t to accept the output data, may be %NULL
* to indicate a no-op @write_func. With a no-op @write_func,
* the surface may be queried or used as a source without
* generating any temporary files.
* @closure: the closure argument for @write_func
* @width_in_points: width of the surface, in points (1 point == 1/72.0 inch)
* @height_in_points: height of the surface, in points (1 point == 1/72.0 inch)
*
* Creates a SVG surface of the specified size in points to be written
* incrementally to the stream represented by @write_func and @closure.
*
* 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.
*
* Since: 1.2
**/
cairo_surface_t *
cairo_svg_surface_create_for_stream (cairo_write_func_t write_func,
void *closure,
double width,
double height)
{
cairo_output_stream_t *stream;
stream = _cairo_output_stream_create (write_func, NULL, closure);
if (_cairo_output_stream_get_status (stream))
return _cairo_surface_create_in_error (_cairo_output_stream_destroy (stream));
return _cairo_svg_surface_create_for_stream_internal (stream, width, height, CAIRO_SVG_VERSION_1_1);
}
/**
* cairo_svg_surface_create:
* @filename: a filename for the SVG output (must be writable), %NULL may be
* used to specify no output. This will generate a SVG surface that
* may be queried and used as a source, without generating a
* temporary file.
* @width_in_points: width of the surface, in points (1 point == 1/72.0 inch)
* @height_in_points: height of the surface, in points (1 point == 1/72.0 inch)
*
* Creates a SVG surface of the specified size in points to be written
* to @filename.
*
* The SVG surface backend recognizes the following MIME types for the
* data attached to a surface (see cairo_surface_set_mime_data()) when
* it is used as a source pattern for drawing on this surface:
* %CAIRO_MIME_TYPE_JPEG, %CAIRO_MIME_TYPE_PNG,
* %CAIRO_MIME_TYPE_URI. If any of them is specified, the SVG backend
* emits a href with the content of MIME data instead of a surface
* snapshot (PNG, Base64-encoded) in the corresponding image tag.
*
* The unofficial MIME type %CAIRO_MIME_TYPE_URI is examined
* first. If present, the URI is emitted as is: assuring the
* correctness of URI is left to the client code.
*
* If %CAIRO_MIME_TYPE_URI is not present, but %CAIRO_MIME_TYPE_JPEG
* or %CAIRO_MIME_TYPE_PNG is specified, the corresponding data is
* Base64-encoded and emitted.
*
* 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.
*
* Since: 1.2
**/
cairo_surface_t *
cairo_svg_surface_create (const char *filename,
double width,
double height)
{
cairo_output_stream_t *stream;
stream = _cairo_output_stream_create_for_filename (filename);
if (_cairo_output_stream_get_status (stream))
return _cairo_surface_create_in_error (_cairo_output_stream_destroy (stream));
return _cairo_svg_surface_create_for_stream_internal (stream, width, height, CAIRO_SVG_VERSION_1_1);
}
static cairo_bool_t
_cairo_surface_is_svg (cairo_surface_t *surface)
{
return surface->backend == &cairo_svg_surface_backend;
}
/* If the abstract_surface is a paginated surface, and that paginated
* surface's target is a svg_surface, then set svg_surface to that
* target. Otherwise return FALSE.
*/
static cairo_bool_t
_extract_svg_surface (cairo_surface_t *surface,
cairo_svg_surface_t **svg_surface)
{
cairo_surface_t *target;
cairo_status_t status_ignored;
if (surface->status)
return FALSE;
if (surface->finished) {
status_ignored = _cairo_surface_set_error (surface,
_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
return FALSE;
}
if (! _cairo_surface_is_paginated (surface)) {
status_ignored = _cairo_surface_set_error (surface,
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
return FALSE;
}
target = _cairo_paginated_surface_get_target (surface);
if (target->status) {
status_ignored = _cairo_surface_set_error (surface,
target->status);
return FALSE;
}
if (target->finished) {
status_ignored = _cairo_surface_set_error (surface,
_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
return FALSE;
}
if (! _cairo_surface_is_svg (target)) {
status_ignored = _cairo_surface_set_error (surface,
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
return FALSE;
}
*svg_surface = (cairo_svg_surface_t *) target;
return TRUE;
}
/**
* cairo_svg_surface_restrict_to_version:
* @surface: a SVG #cairo_surface_t
* @version: SVG version
*
* Restricts the generated SVG file to @version. See cairo_svg_get_versions()
* for a list of available version values that can be used here.
*
* This function should only be called before any drawing operations
* have been performed on the given surface. The simplest way to do
* this is to call this function immediately after creating the
* surface.
*
* Since: 1.2
**/
void
cairo_svg_surface_restrict_to_version (cairo_surface_t *abstract_surface,
cairo_svg_version_t version)
{
cairo_svg_surface_t *surface = NULL; /* hide compiler warning */
if (! _extract_svg_surface (abstract_surface, &surface))
return;
if (version < CAIRO_SVG_VERSION_LAST)
surface->document->svg_version = version;
}
/**
* cairo_svg_get_versions:
* @versions: supported version list
* @num_versions: list length
*
* Used to retrieve the list of supported versions. See
* cairo_svg_surface_restrict_to_version().
*
* Since: 1.2
**/
void
cairo_svg_get_versions (cairo_svg_version_t const **versions,
int *num_versions)
{
if (versions != NULL)
*versions = _cairo_svg_versions;
if (num_versions != NULL)
*num_versions = CAIRO_SVG_VERSION_LAST;
}
/**
* cairo_svg_version_to_string:
* @version: a version id
*
* Get the string representation of the given @version id. This function
* will return %NULL if @version isn't valid. See cairo_svg_get_versions()
* for a way to get the list of valid version ids.
*
* Return value: the string associated to given version.
*
* Since: 1.2
**/
const char *
cairo_svg_version_to_string (cairo_svg_version_t version)
{
if (version >= CAIRO_SVG_VERSION_LAST)
return NULL;
return _cairo_svg_version_strings[version];
}
static cairo_bool_t
_cliprect_covers_surface (cairo_svg_surface_t *surface,
cairo_path_fixed_t *path)
{
cairo_box_t box;
if (_cairo_path_fixed_is_box (path, &box)) {
if (box.p1.x <= 0 &&
box.p1.y <= 0 &&
_cairo_fixed_to_double (box.p2.x) >= surface->width &&
_cairo_fixed_to_double (box.p2.y) >= surface->height)
{
return TRUE;
}
}
return FALSE;
}
static cairo_status_t
_cairo_svg_surface_clipper_intersect_clip_path (cairo_surface_clipper_t *clipper,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_svg_surface_t *surface = cairo_container_of (clipper,
cairo_svg_surface_t,
clipper);
cairo_svg_document_t *document = surface->document;
unsigned int i;
if (path == NULL) {
for (i = 0; i < surface->clip_level; i++)
_cairo_output_stream_printf (surface->xml_node, "</g>\n");
surface->clip_level = 0;
return CAIRO_STATUS_SUCCESS;
}
/* skip trivial whole-page clips */
if (_cliprect_covers_surface (surface, path))
return CAIRO_STATUS_SUCCESS;
_cairo_output_stream_printf (document->xml_node_defs,
"<clipPath id=\"clip%d\">\n"
" <path ",
document->clip_id);
_cairo_svg_surface_emit_path (document->xml_node_defs, path, NULL);
_cairo_output_stream_printf (document->xml_node_defs,
"/>\n"
"</clipPath>\n");
_cairo_output_stream_printf (surface->xml_node,
"<g clip-path=\"url(#clip%d)\" "
"clip-rule=\"%s\">\n",
document->clip_id,
fill_rule == CAIRO_FILL_RULE_EVEN_ODD ?
"evenodd" : "nonzero");
document->clip_id++;
surface->clip_level++;
return CAIRO_STATUS_SUCCESS;
}
static cairo_surface_t *
_cairo_svg_surface_create_for_document (cairo_svg_document_t *document,
cairo_content_t content,
double width,
double height)
{
cairo_svg_surface_t *surface;
cairo_surface_t *paginated;
cairo_status_t status, status_ignored;
surface = malloc (sizeof (cairo_svg_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
_cairo_surface_init (&surface->base,
&cairo_svg_surface_backend,
NULL, /* device */
content);
surface->width = width;
surface->height = height;
surface->document = _cairo_svg_document_reference (document);
surface->clip_level = 0;
_cairo_surface_clipper_init (&surface->clipper,
_cairo_svg_surface_clipper_intersect_clip_path);
surface->base_clip = document->clip_id++;
surface->is_base_clip_emitted = FALSE;
surface->xml_node = _cairo_memory_stream_create ();
status = _cairo_output_stream_get_status (surface->xml_node);
if (unlikely (status))
goto CLEANUP;
_cairo_array_init (&surface->page_set, sizeof (cairo_svg_page_t));
if (content == CAIRO_CONTENT_COLOR) {
_cairo_output_stream_printf (surface->xml_node,
"<rect width=\"%f\" height=\"%f\" "
"style=\"opacity:1;stroke:none;"
"fill:rgb(0,0,0);\"/>\n",
width, height);
status = _cairo_output_stream_get_status (surface->xml_node);
if (unlikely (status))
goto CLEANUP;
}
surface->paginated_mode = CAIRO_PAGINATED_MODE_ANALYZE;
surface->force_fallbacks = FALSE;
surface->content = content;
paginated = _cairo_paginated_surface_create (&surface->base,
surface->content,
&cairo_svg_surface_paginated_backend);
status = paginated->status;
if (status == CAIRO_STATUS_SUCCESS) {
/* paginated keeps the only reference to surface now, drop ours */
cairo_surface_destroy (&surface->base);
return paginated;
}
/* ignore status as we are on the error path */
CLEANUP:
status_ignored = _cairo_output_stream_destroy (surface->xml_node);
status_ignored = _cairo_svg_document_destroy (document);
free (surface);
return _cairo_surface_create_in_error (status);
}
static cairo_surface_t *
_cairo_svg_surface_create_for_stream_internal (cairo_output_stream_t *stream,
double width,
double height,
cairo_svg_version_t version)
{
cairo_svg_document_t *document = NULL; /* silence compiler */
cairo_surface_t *surface;
cairo_status_t status;
status = _cairo_svg_document_create (stream,
width, height, version,
&document);
if (unlikely (status)) {
surface = _cairo_surface_create_in_error (status);
/* consume the output stream on behalf of caller */
status = _cairo_output_stream_destroy (stream);
return surface;
}
surface = _cairo_svg_surface_create_for_document (document, CAIRO_CONTENT_COLOR_ALPHA,
width, height);
if (surface->status) {
status = _cairo_svg_document_destroy (document);
return surface;
}
document->owner = surface;
status = _cairo_svg_document_destroy (document);
/* the ref count should be 2 at this point */
assert (status == CAIRO_STATUS_SUCCESS);
return surface;
}
static cairo_svg_page_t *
_cairo_svg_surface_store_page (cairo_svg_surface_t *surface)
{
cairo_svg_page_t page;
cairo_output_stream_t *stream;
cairo_int_status_t status;
unsigned int i;
stream = _cairo_memory_stream_create ();
if (_cairo_output_stream_get_status (stream)) {
status = _cairo_output_stream_destroy (stream);
return NULL;
}
page.surface_id = surface->base.unique_id;
page.clip_level = surface->clip_level;
page.xml_node = surface->xml_node;
if (_cairo_array_append (&surface->page_set, &page)) {
status = _cairo_output_stream_destroy (stream);
return NULL;
}
surface->xml_node = stream;
surface->clip_level = 0;
for (i = 0; i < page.clip_level; i++)
_cairo_output_stream_printf (page.xml_node, "</g>\n");
_cairo_surface_clipper_reset (&surface->clipper);
return _cairo_array_index (&surface->page_set,
surface->page_set.num_elements - 1);
}
static cairo_int_status_t
_cairo_svg_surface_copy_page (void *abstract_surface)
{
cairo_svg_surface_t *surface = abstract_surface;
cairo_svg_page_t *page;
page = _cairo_svg_surface_store_page (surface);
if (unlikely (page == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_memory_stream_copy (page->xml_node, surface->xml_node);
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_svg_surface_show_page (void *abstract_surface)
{
cairo_svg_surface_t *surface = abstract_surface;
if (unlikely (_cairo_svg_surface_store_page (surface) == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_svg_surface_emit_transform (cairo_output_stream_t *output,
char const *attribute_str,
const cairo_matrix_t *object_matrix,
const cairo_matrix_t *parent_matrix)
{
cairo_matrix_t matrix = *object_matrix;
if (parent_matrix != NULL)
cairo_matrix_multiply (&matrix, &matrix, parent_matrix);
if (!_cairo_matrix_is_identity (&matrix))
_cairo_output_stream_printf (output,
"%s=\"matrix(%f,%f,%f,%f,%f,%f)\"",
attribute_str,
matrix.xx, matrix.yx,
matrix.xy, matrix.yy,
matrix.x0, matrix.y0);
}
typedef struct {
cairo_output_stream_t *output;
const cairo_matrix_t *ctm_inverse;
} svg_path_info_t;
static cairo_status_t
_cairo_svg_path_move_to (void *closure,
const cairo_point_t *point)
{
svg_path_info_t *info = closure;
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
if (info->ctm_inverse)
cairo_matrix_transform_point (info->ctm_inverse, &x, &y);
_cairo_output_stream_printf (info->output, "M %f %f ", x, y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_svg_path_line_to (void *closure,
const cairo_point_t *point)
{
svg_path_info_t *info = closure;
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
if (info->ctm_inverse)
cairo_matrix_transform_point (info->ctm_inverse, &x, &y);
_cairo_output_stream_printf (info->output, "L %f %f ", x, y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_svg_path_curve_to (void *closure,
const cairo_point_t *b,
const cairo_point_t *c,
const cairo_point_t *d)
{
svg_path_info_t *info = closure;
double bx = _cairo_fixed_to_double (b->x);
double by = _cairo_fixed_to_double (b->y);
double cx = _cairo_fixed_to_double (c->x);
double cy = _cairo_fixed_to_double (c->y);
double dx = _cairo_fixed_to_double (d->x);
double dy = _cairo_fixed_to_double (d->y);
if (info->ctm_inverse) {
cairo_matrix_transform_point (info->ctm_inverse, &bx, &by);
cairo_matrix_transform_point (info->ctm_inverse, &cx, &cy);
cairo_matrix_transform_point (info->ctm_inverse, &dx, &dy);
}
_cairo_output_stream_printf (info->output,
"C %f %f %f %f %f %f ",
bx, by, cx, cy, dx, dy);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_svg_path_close_path (void *closure)
{
svg_path_info_t *info = closure;
_cairo_output_stream_printf (info->output, "Z ");
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_svg_surface_emit_path (cairo_output_stream_t *output,
const cairo_path_fixed_t *path,
const cairo_matrix_t *ctm_inverse)
{
cairo_status_t status;
svg_path_info_t info;
_cairo_output_stream_printf (output, "d=\"");
info.output = output;
info.ctm_inverse = ctm_inverse;
status = _cairo_path_fixed_interpret (path,
_cairo_svg_path_move_to,
_cairo_svg_path_line_to,
_cairo_svg_path_curve_to,
_cairo_svg_path_close_path,
&info);
assert (status == CAIRO_STATUS_SUCCESS);
_cairo_output_stream_printf (output, "\"");
}
static cairo_int_status_t
_cairo_svg_document_emit_outline_glyph_data (cairo_svg_document_t *document,
cairo_scaled_font_t *scaled_font,
unsigned long glyph_index)
{
cairo_scaled_glyph_t *scaled_glyph;
cairo_int_status_t status;
status = _cairo_scaled_glyph_lookup (scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS|
CAIRO_SCALED_GLYPH_INFO_PATH,
&scaled_glyph);
if (unlikely (status))
return status;
_cairo_output_stream_printf (document->xml_node_glyphs,
"<path style=\"stroke:none;\" ");
_cairo_svg_surface_emit_path (document->xml_node_glyphs,
scaled_glyph->path, NULL);
_cairo_output_stream_printf (document->xml_node_glyphs,
"/>\n");
return status;
}
static cairo_int_status_t
_cairo_svg_document_emit_bitmap_glyph_data (cairo_svg_document_t *document,
cairo_scaled_font_t *scaled_font,
unsigned long glyph_index)
{
cairo_scaled_glyph_t *scaled_glyph;
cairo_image_surface_t *image;
cairo_status_t status;
uint8_t *row, *byte;
int rows, cols;
int x, y, bit;
status = _cairo_scaled_glyph_lookup (scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS |
CAIRO_SCALED_GLYPH_INFO_SURFACE,
&scaled_glyph);
if (unlikely (status))
return status;
image = _cairo_image_surface_coerce_to_format (scaled_glyph->surface,
CAIRO_FORMAT_A1);
status = image->base.status;
if (unlikely (status))
return status;
_cairo_output_stream_printf (document->xml_node_glyphs, "<g");
_cairo_svg_surface_emit_transform (document->xml_node_glyphs, " transform",
&image->base.device_transform_inverse, NULL);
_cairo_output_stream_printf (document->xml_node_glyphs, ">/n");
for (y = 0, row = image->data, rows = image->height; rows; row += image->stride, rows--, y++) {
for (x = 0, byte = row, cols = (image->width + 7) / 8; cols; byte++, cols--) {
uint8_t output_byte = CAIRO_BITSWAP8_IF_LITTLE_ENDIAN (*byte);
for (bit = 7; bit >= 0 && x < image->width; bit--, x++) {
if (output_byte & (1 << bit)) {
_cairo_output_stream_printf (document->xml_node_glyphs,
"<rect x=\"%d\" y=\"%d\" width=\"1\" height=\"1\"/>\n",
x, y);
}
}
}
}
_cairo_output_stream_printf (document->xml_node_glyphs, "</g>\n");
cairo_surface_destroy (&image->base);
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_svg_document_emit_glyph (cairo_svg_document_t *document,
cairo_scaled_font_t *scaled_font,
unsigned long scaled_font_glyph_index,
unsigned int font_id,
unsigned int subset_glyph_index)
{
cairo_int_status_t status;
_cairo_output_stream_printf (document->xml_node_glyphs,
"<symbol overflow=\"visible\" id=\"glyph%d-%d\">\n",
font_id,
subset_glyph_index);
status = _cairo_svg_document_emit_outline_glyph_data (document,
scaled_font,
scaled_font_glyph_index);
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
status = _cairo_svg_document_emit_bitmap_glyph_data (document,
scaled_font,
scaled_font_glyph_index);
if (unlikely (status))
return status;
_cairo_output_stream_printf (document->xml_node_glyphs, "</symbol>\n");
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_svg_document_emit_font_subset (cairo_scaled_font_subset_t *font_subset,
void *closure)
{
cairo_svg_document_t *document = closure;
cairo_int_status_t status = CAIRO_INT_STATUS_SUCCESS;
unsigned int i;
_cairo_scaled_font_freeze_cache (font_subset->scaled_font);
for (i = 0; i < font_subset->num_glyphs; i++) {
status = _cairo_svg_document_emit_glyph (document,
font_subset->scaled_font,
font_subset->glyphs[i],
font_subset->font_id, i);
if (unlikely (status))
break;
}
_cairo_scaled_font_thaw_cache (font_subset->scaled_font);
return status;
}
static cairo_status_t
_cairo_svg_document_emit_font_subsets (cairo_svg_document_t *document)
{
cairo_status_t status;
status = _cairo_scaled_font_subsets_foreach_scaled (document->font_subsets,
_cairo_svg_document_emit_font_subset,
document);
if (unlikely (status))
goto FAIL;
status = _cairo_scaled_font_subsets_foreach_user (document->font_subsets,
_cairo_svg_document_emit_font_subset,
document);
FAIL:
_cairo_scaled_font_subsets_destroy (document->font_subsets);
document->font_subsets = NULL;
return status;
}
static char const *
_cairo_svg_surface_operators[] = {
"clear",
"src", "src-over", "src-in",
"src-out", "src-atop",
"dst", "dst-over", "dst-in",
"dst-out", "dst-atop",
"xor", "plus",
"color-dodge", /* FIXME: saturate ? */
"multiply", "screen", "overlay",
"darken", "lighten",
"color-dodge", "color-burn",
"hard-light", "soft-light",
"difference", "exclusion"
};
static cairo_bool_t
_cairo_svg_surface_analyze_operator (cairo_svg_surface_t *surface,
cairo_operator_t op)
{
/* guard against newly added operators */
if (op >= ARRAY_LENGTH (_cairo_svg_surface_operators))
return CAIRO_INT_STATUS_UNSUPPORTED;
/* allow operators being NULL if they are unsupported */
if (_cairo_svg_surface_operators[op] == NULL)
return CAIRO_INT_STATUS_UNSUPPORTED;
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_svg_surface_analyze_operation (cairo_svg_surface_t *surface,
cairo_operator_t op,
const cairo_pattern_t *pattern)
{
cairo_svg_document_t *document = surface->document;
if (surface->force_fallbacks &&
surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
if (pattern->type == CAIRO_PATTERN_TYPE_MESH)
return CAIRO_INT_STATUS_UNSUPPORTED;
/* SVG doesn't support extend reflect for image pattern */
if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE &&
pattern->extend == CAIRO_EXTEND_REFLECT)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (document->svg_version >= CAIRO_SVG_VERSION_1_2)
return _cairo_svg_surface_analyze_operator (surface, op);
if (op == CAIRO_OPERATOR_OVER)
return CAIRO_STATUS_SUCCESS;
/* The SOURCE operator is only supported if there is nothing
* painted underneath. */
if (op == CAIRO_OPERATOR_SOURCE)
return CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY;
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static cairo_int_status_t
_cairo_svg_surface_operation_supported (cairo_svg_surface_t *surface,
cairo_operator_t op,
const cairo_pattern_t *pattern)
{
return _cairo_svg_surface_analyze_operation (surface, op, pattern) != CAIRO_INT_STATUS_UNSUPPORTED;
}
static cairo_status_t
_cairo_svg_surface_finish (void *abstract_surface)
{
cairo_status_t status, status2;
cairo_svg_surface_t *surface = abstract_surface;
cairo_svg_document_t *document = surface->document;
cairo_svg_page_t *page;
unsigned int i;
if (_cairo_paginated_surface_get_target (document->owner) == &surface->base)
status = _cairo_svg_document_finish (document);
else
status = CAIRO_STATUS_SUCCESS;
if (surface->xml_node != NULL) {
status2 = _cairo_output_stream_destroy (surface->xml_node);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
}