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rsvg-cairo-draw.c
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rsvg-cairo-draw.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set sw=4 sts=4 ts=4 expandtab: */
/*
rsvg-shapes.c: Draw shapes with cairo
Copyright (C) 2005 Dom Lachowicz <cinamod@hotmail.com>
Copyright (C) 2005 Caleb Moore <c.moore@student.unsw.edu.au>
Copyright (C) 2005 Red Hat, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Authors: Dom Lachowicz <cinamod@hotmail.com>,
Caleb Moore <c.moore@student.unsw.edu.au>
Carl Worth <cworth@cworth.org>
*/
#include "config.h"
#include "rsvg-cairo-draw.h"
#include "rsvg-cairo-render.h"
#include "rsvg-cairo-clip.h"
#include "rsvg-styles.h"
#include "rsvg-path.h"
#include "rsvg-filter.h"
#include "rsvg-structure.h"
#include "rsvg-image.h"
#include <math.h>
#include <string.h>
#include <pango/pangocairo.h>
static void
_pattern_add_rsvg_color_stops (cairo_pattern_t * pattern,
GPtrArray * stops, guint32 current_color_rgb, guint8 opacity)
{
gsize i;
RsvgGradientStop *stop;
RsvgNode *node;
guint32 rgba;
for (i = 0; i < stops->len; i++) {
node = (RsvgNode *) g_ptr_array_index (stops, i);
if (RSVG_NODE_TYPE (node) != RSVG_NODE_TYPE_STOP)
continue;
stop = (RsvgGradientStop *) node;
rgba = stop->rgba;
cairo_pattern_add_color_stop_rgba (pattern, stop->offset,
((rgba >> 24) & 0xff) / 255.0,
((rgba >> 16) & 0xff) / 255.0,
((rgba >> 8) & 0xff) / 255.0,
(((rgba >> 0) & 0xff) * opacity) / 255.0 / 255.0);
}
}
static void
_set_source_rsvg_linear_gradient (RsvgDrawingCtx * ctx,
RsvgLinearGradient * linear,
guint32 current_color_rgb, guint8 opacity, RsvgBbox bbox)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_t *cr = render->cr;
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
RsvgLinearGradient statlinear;
statlinear = *linear;
linear = &statlinear;
rsvg_linear_gradient_fix_fallback (ctx, linear);
if (linear->has_current_color)
current_color_rgb = linear->current_color;
if (linear->obj_bbox)
_rsvg_push_view_box (ctx, 1., 1.);
pattern = cairo_pattern_create_linear (_rsvg_css_normalize_length (&linear->x1, ctx, 'h'),
_rsvg_css_normalize_length (&linear->y1, ctx, 'v'),
_rsvg_css_normalize_length (&linear->x2, ctx, 'h'),
_rsvg_css_normalize_length (&linear->y2, ctx, 'v'));
if (linear->obj_bbox)
_rsvg_pop_view_box (ctx);
matrix = linear->affine;
if (linear->obj_bbox) {
cairo_matrix_t bboxmatrix;
cairo_matrix_init (&bboxmatrix, bbox.rect.width, 0, 0, bbox.rect.height,
bbox.rect.x, bbox.rect.y);
cairo_matrix_multiply (&matrix, &matrix, &bboxmatrix);
}
cairo_matrix_invert (&matrix);
cairo_pattern_set_matrix (pattern, &matrix);
cairo_pattern_set_extend (pattern, linear->spread);
_pattern_add_rsvg_color_stops (pattern, linear->super.children, current_color_rgb, opacity);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
}
static void
_set_source_rsvg_radial_gradient (RsvgDrawingCtx * ctx,
RsvgRadialGradient * radial,
guint32 current_color_rgb, guint8 opacity, RsvgBbox bbox)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_t *cr = render->cr;
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
RsvgRadialGradient statradial;
statradial = *radial;
radial = &statradial;
rsvg_radial_gradient_fix_fallback (ctx, radial);
if (radial->has_current_color)
current_color_rgb = radial->current_color;
if (radial->obj_bbox)
_rsvg_push_view_box (ctx, 1., 1.);
pattern = cairo_pattern_create_radial (_rsvg_css_normalize_length (&radial->fx, ctx, 'h'),
_rsvg_css_normalize_length (&radial->fy, ctx, 'v'), 0.0,
_rsvg_css_normalize_length (&radial->cx, ctx, 'h'),
_rsvg_css_normalize_length (&radial->cy, ctx, 'v'),
_rsvg_css_normalize_length (&radial->r, ctx, 'o'));
if (radial->obj_bbox)
_rsvg_pop_view_box (ctx);
matrix = radial->affine;
if (radial->obj_bbox) {
cairo_matrix_t bboxmatrix;
cairo_matrix_init (&bboxmatrix, bbox.rect.width, 0, 0, bbox.rect.height,
bbox.rect.x, bbox.rect.y);
cairo_matrix_multiply (&matrix, &matrix, &bboxmatrix);
}
cairo_matrix_invert (&matrix);
cairo_pattern_set_matrix (pattern, &matrix);
cairo_pattern_set_extend (pattern, radial->spread);
_pattern_add_rsvg_color_stops (pattern, radial->super.children, current_color_rgb, opacity);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
}
static void
_set_source_rsvg_solid_color (RsvgDrawingCtx * ctx,
RsvgSolidColor * color, guint8 opacity, guint32 current_color)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_t *cr = render->cr;
guint32 argb = color->argb;
double r, g, b, a;
if (color->currentcolor)
argb = current_color;
r = ((argb >> 16) & 0xff) / 255.0;
g = ((argb >> 8) & 0xff) / 255.0;
b = ((argb >> 0) & 0xff) / 255.0;
a = (argb >> 24) / 255.0 * (opacity / 255.0);
cairo_set_source_rgba (cr, r, g, b, a);
}
static void
_set_source_rsvg_pattern (RsvgDrawingCtx * ctx,
RsvgPattern * rsvg_pattern, guint8 opacity, RsvgBbox bbox)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
RsvgPattern local_pattern = *rsvg_pattern;
cairo_t *cr_render, *cr_pattern;
cairo_pattern_t *pattern;
cairo_surface_t *surface;
cairo_matrix_t matrix;
cairo_matrix_t affine, caffine, taffine;
double bbwscale, bbhscale, scwscale, schscale;
double patternw, patternh, patternx, patterny;
double scaled_width, scaled_height;
int pw, ph;
rsvg_pattern = &local_pattern;
rsvg_pattern_fix_fallback (ctx, rsvg_pattern);
cr_render = render->cr;
if (rsvg_pattern->obj_bbox)
_rsvg_push_view_box (ctx, 1., 1.);
patternx = _rsvg_css_normalize_length (&rsvg_pattern->x, ctx, 'h');
patterny = _rsvg_css_normalize_length (&rsvg_pattern->y, ctx, 'v');
patternw = _rsvg_css_normalize_length (&rsvg_pattern->width, ctx, 'h');
patternh = _rsvg_css_normalize_length (&rsvg_pattern->height, ctx, 'v');
if (rsvg_pattern->obj_bbox)
_rsvg_pop_view_box (ctx);
/* Work out the size of the rectangle so it takes into account the object bounding box */
if (rsvg_pattern->obj_bbox) {
bbwscale = bbox.rect.width;
bbhscale = bbox.rect.height;
} else {
bbwscale = 1.0;
bbhscale = 1.0;
}
cairo_matrix_multiply (&taffine, &rsvg_pattern->affine, &rsvg_current_state (ctx)->affine);
scwscale = sqrt (taffine.xx * taffine.xx + taffine.xy * taffine.xy);
schscale = sqrt (taffine.yx * taffine.yx + taffine.yy * taffine.yy);
pw = patternw * bbwscale * scwscale;
ph = patternh * bbhscale * schscale;
scaled_width = patternw * bbwscale;
scaled_height = patternh * bbhscale;
if (fabs (scaled_width) < DBL_EPSILON || fabs (scaled_height) < DBL_EPSILON)
return;
scwscale = pw / scaled_width;
schscale = ph / scaled_height;
surface = cairo_surface_create_similar (cairo_get_target (cr_render),
CAIRO_CONTENT_COLOR_ALPHA, pw, ph);
cr_pattern = cairo_create (surface);
/* Create the pattern coordinate system */
if (rsvg_pattern->obj_bbox) {
/* subtract the pattern origin */
cairo_matrix_init_translate (&affine,
bbox.rect.x + patternx * bbox.rect.width,
bbox.rect.y + patterny * bbox.rect.height);
} else {
/* subtract the pattern origin */
cairo_matrix_init_translate (&affine, patternx, patterny);
}
/* Apply the pattern transform */
cairo_matrix_multiply (&affine, &affine, &rsvg_pattern->affine);
/* Create the pattern contents coordinate system */
if (rsvg_pattern->vbox.active) {
/* If there is a vbox, use that */
double w, h, x, y;
w = patternw * bbwscale;
h = patternh * bbhscale;
x = 0;
y = 0;
rsvg_preserve_aspect_ratio (rsvg_pattern->preserve_aspect_ratio,
rsvg_pattern->vbox.rect.width, rsvg_pattern->vbox.rect.height,
&w, &h, &x, &y);
x -= rsvg_pattern->vbox.rect.x * w / rsvg_pattern->vbox.rect.width;
y -= rsvg_pattern->vbox.rect.y * h / rsvg_pattern->vbox.rect.height;
cairo_matrix_init (&caffine,
w / rsvg_pattern->vbox.rect.width,
0,
0,
h / rsvg_pattern->vbox.rect.height,
x,
y);
_rsvg_push_view_box (ctx, rsvg_pattern->vbox.rect.width, rsvg_pattern->vbox.rect.height);
} else if (rsvg_pattern->obj_cbbox) {
/* If coords are in terms of the bounding box, use them */
cairo_matrix_init_scale (&caffine, bbox.rect.width, bbox.rect.height);
_rsvg_push_view_box (ctx, 1., 1.);
} else {
cairo_matrix_init_identity (&caffine);
}
if (scwscale != 1.0 || schscale != 1.0) {
cairo_matrix_t scalematrix;
cairo_matrix_init_scale (&scalematrix, scwscale, schscale);
cairo_matrix_multiply (&caffine, &caffine, &scalematrix);
cairo_matrix_init_scale (&scalematrix, 1. / scwscale, 1. / schscale);
cairo_matrix_multiply (&affine, &scalematrix, &affine);
}
/* Draw to another surface */
render->cr = cr_pattern;
/* Set up transformations to be determined by the contents units */
rsvg_state_push (ctx);
rsvg_current_state (ctx)->personal_affine =
rsvg_current_state (ctx)->affine = caffine;
/* Draw everything */
_rsvg_node_draw_children ((RsvgNode *) rsvg_pattern, ctx, 2);
/* Return to the original coordinate system */
rsvg_state_pop (ctx);
/* Set the render to draw where it used to */
render->cr = cr_render;
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
matrix = affine;
if (cairo_matrix_invert (&matrix) != CAIRO_STATUS_SUCCESS)
goto out;
cairo_pattern_set_matrix (pattern, &matrix);
cairo_pattern_set_filter (pattern, CAIRO_FILTER_BEST);
cairo_set_source (cr_render, pattern);
cairo_pattern_destroy (pattern);
cairo_destroy (cr_pattern);
cairo_surface_destroy (surface);
out:
if (rsvg_pattern->obj_cbbox || rsvg_pattern->vbox.active)
_rsvg_pop_view_box (ctx);
}
/* note: _set_source_rsvg_paint_server does not change cairo's CTM */
static void
_set_source_rsvg_paint_server (RsvgDrawingCtx * ctx,
guint32 current_color_rgb,
RsvgPaintServer * ps,
guint8 opacity, RsvgBbox bbox, guint32 current_color)
{
RsvgNode *node;
switch (ps->type) {
case RSVG_PAINT_SERVER_IRI:
node = rsvg_acquire_node (ctx, ps->core.iri);
if (node == NULL)
break;
else if (RSVG_NODE_TYPE (node) == RSVG_NODE_TYPE_LINEAR_GRADIENT)
_set_source_rsvg_linear_gradient (ctx, (RsvgLinearGradient *) node, current_color_rgb, opacity, bbox);
else if (RSVG_NODE_TYPE (node) == RSVG_NODE_TYPE_RADIAL_GRADIENT)
_set_source_rsvg_radial_gradient (ctx, (RsvgRadialGradient *) node, current_color_rgb, opacity, bbox);
else if (RSVG_NODE_TYPE (node) == RSVG_NODE_TYPE_PATTERN)
_set_source_rsvg_pattern (ctx, (RsvgPattern *) node, opacity, bbox);
rsvg_release_node (ctx, node);
break;
case RSVG_PAINT_SERVER_SOLID:
_set_source_rsvg_solid_color (ctx, ps->core.color, opacity, current_color);
break;
}
}
static void
_set_rsvg_affine (RsvgCairoRender * render, cairo_matrix_t *affine)
{
cairo_t * cr = render->cr;
cairo_matrix_t matrix;
gboolean nest = cr != render->initial_cr;
cairo_matrix_init (&matrix,
affine->xx, affine->yx,
affine->xy, affine->yy,
affine->x0 + (nest ? 0 : render->offset_x),
affine->y0 + (nest ? 0 : render->offset_y));
cairo_set_matrix (cr, &matrix);
}
#ifdef HAVE_PANGOFT2
static cairo_font_options_t *
get_font_options_for_testing (void)
{
cairo_font_options_t *options;
options = cairo_font_options_create ();
cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_GRAY);
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_FULL);
cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_ON);
return options;
}
static void
set_font_options_for_testing (PangoContext *context)
{
cairo_font_options_t *font_options;
font_options = get_font_options_for_testing ();
pango_cairo_context_set_font_options (context, font_options);
cairo_font_options_destroy (font_options);
}
static void
create_font_config_for_testing (RsvgCairoRender *render)
{
const char *font_path = SRCDIR "/tests/resources/LiberationSans-Regular.ttf";
if (render->font_config_for_testing != NULL)
return;
render->font_config_for_testing = FcConfigCreate ();
if (!FcConfigAppFontAddFile (render->font_config_for_testing, (const FcChar8 *) font_path)) {
g_error ("Could not load font file \"%s\" for tests; aborting", font_path);
}
}
static PangoFontMap *
get_font_map_for_testing (RsvgCairoRender *render)
{
create_font_config_for_testing (render);
if (!render->font_map_for_testing) {
render->font_map_for_testing = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT);
pango_fc_font_map_set_config (PANGO_FC_FONT_MAP (render->font_map_for_testing),
render->font_config_for_testing);
}
return render->font_map_for_testing;
}
#endif
PangoContext *
rsvg_cairo_create_pango_context (RsvgDrawingCtx * ctx)
{
PangoFontMap *fontmap;
PangoContext *context;
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
#ifdef HAVE_PANGOFT2
if (ctx->is_testing) {
fontmap = get_font_map_for_testing (render);
} else {
#endif
fontmap = pango_cairo_font_map_get_default ();
#ifdef HAVE_PANGOFT2
}
#endif
context = pango_font_map_create_context (fontmap);
pango_cairo_update_context (render->cr, context);
pango_cairo_context_set_resolution (context, ctx->dpi_y);
#ifdef HAVE_PANGOFT2
if (ctx->is_testing) {
set_font_options_for_testing (context);
}
#endif
return context;
}
void
rsvg_cairo_render_pango_layout (RsvgDrawingCtx * ctx, PangoLayout * layout, double x, double y)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
RsvgState *state = rsvg_current_state (ctx);
PangoRectangle ink;
RsvgBbox bbox;
PangoGravity gravity = pango_context_get_gravity (pango_layout_get_context (layout));
double rotation;
pango_layout_get_extents(layout, &ink, NULL);
if (ink.width == 0 || ink.height == 0) {
return;
}
cairo_set_antialias (render->cr, state->text_rendering_type);
_set_rsvg_affine (render, &state->affine);
rsvg_bbox_init (&bbox, &state->affine);
if (PANGO_GRAVITY_IS_VERTICAL (gravity)) {
bbox.rect.x = x + (ink.x - ink.height) / (double)PANGO_SCALE;
bbox.rect.y = y + ink.y / (double)PANGO_SCALE;
bbox.rect.width = ink.height / (double)PANGO_SCALE;
bbox.rect.height = ink.width / (double)PANGO_SCALE;
} else {
bbox.rect.x = x + ink.x / (double)PANGO_SCALE;
bbox.rect.y = y + ink.y / (double)PANGO_SCALE;
bbox.rect.width = ink.width / (double)PANGO_SCALE;
bbox.rect.height = ink.height / (double)PANGO_SCALE;
}
bbox.virgin = 0;
rotation = pango_gravity_to_rotation (gravity);
if (state->fill) {
cairo_save (render->cr);
cairo_move_to (render->cr, x, y);
rsvg_bbox_insert (&render->bbox, &bbox);
_set_source_rsvg_paint_server (ctx,
state->current_color,
state->fill,
state->fill_opacity,
bbox, rsvg_current_state (ctx)->current_color);
if (rotation != 0.)
cairo_rotate (render->cr, -rotation);
pango_cairo_update_layout (render->cr, layout);
pango_cairo_show_layout (render->cr, layout);
cairo_restore (render->cr);
}
if (state->stroke) {
cairo_save (render->cr);
cairo_move_to (render->cr, x, y);
rsvg_bbox_insert (&render->bbox, &bbox);
_set_source_rsvg_paint_server (ctx,
state->current_color,
state->stroke,
state->stroke_opacity,
bbox, rsvg_current_state (ctx)->current_color);
if (rotation != 0.)
cairo_rotate (render->cr, -rotation);
pango_cairo_update_layout (render->cr, layout);
pango_cairo_layout_path (render->cr, layout);
cairo_set_line_width (render->cr, _rsvg_css_normalize_length (&state->stroke_width, ctx, 'h'));
cairo_set_miter_limit (render->cr, state->miter_limit);
cairo_set_line_cap (render->cr, (cairo_line_cap_t) state->cap);
cairo_set_line_join (render->cr, (cairo_line_join_t) state->join);
cairo_set_dash (render->cr, state->dash.dash, state->dash.n_dash,
_rsvg_css_normalize_length (&state->dash.offset, ctx, 'o'));
cairo_stroke (render->cr);
cairo_restore (render->cr);
}
}
void
rsvg_cairo_render_path (RsvgDrawingCtx * ctx, const cairo_path_t *path)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
RsvgState *state = rsvg_current_state (ctx);
cairo_t *cr;
RsvgBbox bbox;
double backup_tolerance;
rsvg_cairo_push_discrete_layer (ctx);
cr = render->cr;
cairo_set_antialias (cr, state->shape_rendering_type);
_set_rsvg_affine (render, &state->affine);
cairo_set_line_width (cr, _rsvg_css_normalize_length (&state->stroke_width, ctx, 'h'));
cairo_set_miter_limit (cr, state->miter_limit);
cairo_set_line_cap (cr, (cairo_line_cap_t) state->cap);
cairo_set_line_join (cr, (cairo_line_join_t) state->join);
cairo_set_dash (cr, state->dash.dash, state->dash.n_dash,
_rsvg_css_normalize_length (&state->dash.offset, ctx, 'o'));
cairo_append_path (cr, path);
rsvg_bbox_init (&bbox, &state->affine);
backup_tolerance = cairo_get_tolerance (cr);
cairo_set_tolerance (cr, 1.0);
/* dropping the precision of cairo's bezier subdivision, yielding 2x
_rendering_ time speedups, are these rather expensive operations
really needed here? */
/* FIXME: See https://www.w3.org/TR/SVG/coords.html#ObjectBoundingBox for
* discussion on how to compute bounding boxes to be used for viewports and
* clipping. It looks like we should be using cairo_path_extents() for
* that, not cairo_fill_extents().
*
* We may need to maintain *two* sets of bounding boxes - one for
* viewports/clipping, and one for user applications like a
* rsvg_compute_ink_rect() function in the future.
*
* See https://bugzilla.gnome.org/show_bug.cgi?id=760112 for discussion of a
* public API to get the ink rectangle.
*/
/* Bounding box for fill
*
* Unlike the case for stroke, for fills we always compute the bounding box.
* In GNOME we have SVGs for symbolic icons where each icon has a bounding
* rectangle with no fill and no stroke, and inside it there are the actual
* paths for the icon's shape. We need to be able to compute the bounding
* rectangle's extents, even when it has no fill nor stroke.
*/
{
RsvgBbox fb;
rsvg_bbox_init (&fb, &state->affine);
cairo_fill_extents (cr, &fb.rect.x, &fb.rect.y, &fb.rect.width, &fb.rect.height);
fb.rect.width -= fb.rect.x;
fb.rect.height -= fb.rect.y;
fb.virgin = 0;
rsvg_bbox_insert (&bbox, &fb);
}
/* Bounding box for stroke */
if (state->stroke != NULL) {
RsvgBbox sb;
rsvg_bbox_init (&sb, &state->affine);
cairo_stroke_extents (cr, &sb.rect.x, &sb.rect.y, &sb.rect.width, &sb.rect.height);
sb.rect.width -= sb.rect.x;
sb.rect.height -= sb.rect.y;
sb.virgin = 0;
rsvg_bbox_insert (&bbox, &sb);
}
cairo_set_tolerance (cr, backup_tolerance);
rsvg_bbox_insert (&render->bbox, &bbox);
if (state->fill != NULL) {
int opacity;
cairo_set_fill_rule (cr, state->fill_rule);
opacity = state->fill_opacity;
_set_source_rsvg_paint_server (ctx,
state->current_color,
state->fill,
opacity, bbox, rsvg_current_state (ctx)->current_color);
if (state->stroke != NULL)
cairo_fill_preserve (cr);
else
cairo_fill (cr);
}
if (state->stroke != NULL) {
int opacity;
opacity = state->stroke_opacity;
_set_source_rsvg_paint_server (ctx,
state->current_color,
state->stroke,
opacity, bbox, rsvg_current_state (ctx)->current_color);
cairo_stroke (cr);
}
cairo_new_path (cr); /* clear the path in case stroke == fill == NULL; otherwise we leave it around from computing the bounding box */
rsvg_cairo_pop_discrete_layer (ctx);
}
void
rsvg_cairo_render_surface (RsvgDrawingCtx *ctx,
cairo_surface_t *surface,
double src_x,
double src_y,
double w,
double h)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
RsvgState *state = rsvg_current_state (ctx);
int width, height;
double dwidth, dheight;
RsvgBbox bbox;
if (surface == NULL)
return;
g_return_if_fail (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE);
dwidth = width = cairo_image_surface_get_width (surface);
dheight = height = cairo_image_surface_get_height (surface);
if (width == 0 || height == 0)
return;
rsvg_bbox_init (&bbox, &state->affine);
bbox.rect.x = src_x;
bbox.rect.y = src_y;
bbox.rect.width = w;
bbox.rect.height = h;
bbox.virgin = 0;
_set_rsvg_affine (render, &state->affine);
cairo_scale (render->cr, w / dwidth, h / dheight);
src_x *= dwidth / w;
src_y *= dheight / h;
cairo_set_operator (render->cr, state->comp_op);
#if 1
cairo_set_source_surface (render->cr, surface, src_x, src_y);
#else
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
cairo_matrix_init_translate (&matrix, -src_x, -src_y);
cairo_pattern_set_matrix (pattern, &matrix);
cairo_set_source (render->cr, pattern);
cairo_pattern_destroy (pattern);
}
#endif
cairo_paint (render->cr);
rsvg_bbox_insert (&render->bbox, &bbox);
}
static void
rsvg_cairo_generate_mask (cairo_t * cr, RsvgMask * self, RsvgDrawingCtx * ctx, RsvgBbox * bbox)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_surface_t *surface;
cairo_t *mask_cr, *save_cr;
RsvgState *state = rsvg_current_state (ctx);
guint8 *pixels;
guint32 width = render->width, height = render->height;
guint32 rowstride = width * 4, row, i;
cairo_matrix_t affinesave;
double sx, sy, sw, sh;
gboolean nest = cr != render->initial_cr;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy (surface);
return;
}
pixels = cairo_image_surface_get_data (surface);
rowstride = cairo_image_surface_get_stride (surface);
if (self->maskunits == objectBoundingBox)
_rsvg_push_view_box (ctx, 1, 1);
sx = _rsvg_css_normalize_length (&self->x, ctx, 'h');
sy = _rsvg_css_normalize_length (&self->y, ctx, 'v');
sw = _rsvg_css_normalize_length (&self->width, ctx, 'h');
sh = _rsvg_css_normalize_length (&self->height, ctx, 'v');
if (self->maskunits == objectBoundingBox)
_rsvg_pop_view_box (ctx);
mask_cr = cairo_create (surface);
save_cr = render->cr;
render->cr = mask_cr;
if (self->maskunits == objectBoundingBox)
rsvg_cairo_add_clipping_rect (ctx,
sx * bbox->rect.width + bbox->rect.x,
sy * bbox->rect.height + bbox->rect.y,
sw * bbox->rect.width,
sh * bbox->rect.height);
else
rsvg_cairo_add_clipping_rect (ctx, sx, sy, sw, sh);
/* Horribly dirty hack to have the bbox premultiplied to everything */
if (self->contentunits == objectBoundingBox) {
cairo_matrix_t bbtransform;
cairo_matrix_init (&bbtransform,
bbox->rect.width,
0,
0,
bbox->rect.height,
bbox->rect.x,
bbox->rect.y);
affinesave = self->super.state->affine;
cairo_matrix_multiply (&self->super.state->affine, &bbtransform, &self->super.state->affine);
_rsvg_push_view_box (ctx, 1, 1);
}
rsvg_state_push (ctx);
_rsvg_node_draw_children (&self->super, ctx, 0);
rsvg_state_pop (ctx);
if (self->contentunits == objectBoundingBox) {
_rsvg_pop_view_box (ctx);
self->super.state->affine = affinesave;
}
render->cr = save_cr;
for (row = 0; row < height; row++) {
guint8 *row_data = (pixels + (row * rowstride));
for (i = 0; i < width; i++) {
guint32 *pixel = (guint32 *) row_data + i;
/*
* Assuming, the pixel is linear RGB (not sRGB)
* y = luminance
* Y = 0.2126 R + 0.7152 G + 0.0722 B
* 1.0 opacity = 255
*
* When Y = 1.0, pixel for mask should be 0xFFFFFFFF
* (you get 1.0 luminance from 255 from R, G and B)
*
* r_mult = 0xFFFFFFFF / (255.0 * 255.0) * .2126 = 14042.45 ~= 14042
* g_mult = 0xFFFFFFFF / (255.0 * 255.0) * .7152 = 47239.69 ~= 47240
* b_mult = 0xFFFFFFFF / (255.0 * 255.0) * .0722 = 4768.88 ~= 4769
*
* This allows for the following expected behaviour:
* (we only care about the most sig byte)
* if pixel = 0x00FFFFFF, pixel' = 0xFF......
* if pixel = 0x00020202, pixel' = 0x02......
* if pixel = 0x00000000, pixel' = 0x00......
*/
*pixel = ((((*pixel & 0x00ff0000) >> 16) * 14042 +
((*pixel & 0x0000ff00) >> 8) * 47240 +
((*pixel & 0x000000ff) ) * 4769 ) * state->opacity);
}
}
cairo_destroy (mask_cr);
cairo_identity_matrix (cr);
cairo_mask_surface (cr, surface,
nest ? 0 : render->offset_x,
nest ? 0 : render->offset_y);
cairo_surface_destroy (surface);
}
static void
rsvg_cairo_push_render_stack (RsvgDrawingCtx * ctx)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_surface_t *surface;
cairo_t *child_cr;
RsvgBbox *bbox;
RsvgState *state = rsvg_current_state (ctx);
gboolean lateclip = FALSE;
if (rsvg_current_state (ctx)->clip_path) {
RsvgNode *node;
node = rsvg_acquire_node (ctx, rsvg_current_state (ctx)->clip_path);
if (node && RSVG_NODE_TYPE (node) == RSVG_NODE_TYPE_CLIP_PATH) {
RsvgClipPath *clip_path = (RsvgClipPath *) node;
switch (clip_path->units) {
case userSpaceOnUse:
rsvg_cairo_clip (ctx, clip_path, NULL);
break;
case objectBoundingBox:
lateclip = TRUE;
break;
default:
g_assert_not_reached ();
break;
}
}
rsvg_release_node (ctx, node);
}
if (state->opacity == 0xFF
&& !state->filter && !state->mask && !lateclip && (state->comp_op == CAIRO_OPERATOR_OVER)
&& (state->enable_background == RSVG_ENABLE_BACKGROUND_ACCUMULATE))
return;
if (!state->filter) {
surface = cairo_surface_create_similar (cairo_get_target (render->cr),
CAIRO_CONTENT_COLOR_ALPHA,
render->width, render->height);
} else {
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
render->width, render->height);
/* The surface reference is owned by the child_cr created below and put on the cr_stack! */
render->surfaces_stack = g_list_prepend (render->surfaces_stack, surface);
}
#if 0
if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy (surface);
return;
}
#endif
child_cr = cairo_create (surface);
cairo_surface_destroy (surface);
render->cr_stack = g_list_prepend (render->cr_stack, render->cr);
render->cr = child_cr;
bbox = g_new (RsvgBbox, 1);
*bbox = render->bbox;
render->bb_stack = g_list_prepend (render->bb_stack, bbox);
rsvg_bbox_init (&render->bbox, &state->affine);
}
void
rsvg_cairo_push_discrete_layer (RsvgDrawingCtx * ctx)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_save (render->cr);
rsvg_cairo_push_render_stack (ctx);
}
static void
rsvg_cairo_pop_render_stack (RsvgDrawingCtx * ctx)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_t *child_cr = render->cr;
RsvgClipPath *lateclip = NULL;
cairo_surface_t *surface = NULL;
RsvgState *state = rsvg_current_state (ctx);
gboolean nest, needs_destroy = FALSE;
if (rsvg_current_state (ctx)->clip_path) {
RsvgNode *node;
node = rsvg_acquire_node (ctx, rsvg_current_state (ctx)->clip_path);
if (node && RSVG_NODE_TYPE (node) == RSVG_NODE_TYPE_CLIP_PATH
&& ((RsvgClipPath *) node)->units == objectBoundingBox)
lateclip = (RsvgClipPath *) node;
else
rsvg_release_node (ctx, node);
}
if (state->opacity == 0xFF
&& !state->filter && !state->mask && !lateclip && (state->comp_op == CAIRO_OPERATOR_OVER)
&& (state->enable_background == RSVG_ENABLE_BACKGROUND_ACCUMULATE))
return;
surface = cairo_get_target (child_cr);
if (state->filter) {
RsvgNode *filter;
cairo_surface_t *output;
filter = rsvg_acquire_node (ctx, state->filter);
output = render->surfaces_stack->data;
render->surfaces_stack = g_list_delete_link (render->surfaces_stack, render->surfaces_stack);
if (filter && RSVG_NODE_TYPE (filter) == RSVG_NODE_TYPE_FILTER) {
needs_destroy = TRUE;
surface = rsvg_filter_render ((RsvgFilter *) filter, output, ctx, &render->bbox, "2103");
/* Don't destroy the output surface, it's owned by child_cr */
}
rsvg_release_node (ctx, filter);
}
render->cr = (cairo_t *) render->cr_stack->data;
render->cr_stack = g_list_delete_link (render->cr_stack, render->cr_stack);
nest = render->cr != render->initial_cr;
cairo_identity_matrix (render->cr);
cairo_set_source_surface (render->cr, surface,
nest ? 0 : render->offset_x,
nest ? 0 : render->offset_y);
if (lateclip) {
rsvg_cairo_clip (ctx, lateclip, &render->bbox);
rsvg_release_node (ctx, (RsvgNode *) lateclip);
}
cairo_set_operator (render->cr, state->comp_op);
if (state->mask) {
RsvgNode *mask;
mask = rsvg_acquire_node (ctx, state->mask);
if (mask && RSVG_NODE_TYPE (mask) == RSVG_NODE_TYPE_MASK)
rsvg_cairo_generate_mask (render->cr, (RsvgMask *) mask, ctx, &render->bbox);
rsvg_release_node (ctx, mask);
} else if (state->opacity != 0xFF)
cairo_paint_with_alpha (render->cr, (double) state->opacity / 255.0);
else
cairo_paint (render->cr);
cairo_destroy (child_cr);
rsvg_bbox_insert ((RsvgBbox *) render->bb_stack->data, &render->bbox);
render->bbox = *((RsvgBbox *) render->bb_stack->data);
g_free (render->bb_stack->data);
render->bb_stack = g_list_delete_link (render->bb_stack, render->bb_stack);
if (needs_destroy) {
cairo_surface_destroy (surface);
}
}
void
rsvg_cairo_pop_discrete_layer (RsvgDrawingCtx * ctx)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
rsvg_cairo_pop_render_stack (ctx);
cairo_restore (render->cr);
}