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rsvg-filter.c
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rsvg-filter.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-filter.c: Provides filters
Copyright (C) 2004 Caleb Moore
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.
Author: Caleb Moore <c.moore@student.unsw.edu.au>
*/
#include "config.h"
#include "rsvg-private.h"
#include "rsvg-filter.h"
#include "rsvg-styles.h"
#include "rsvg-image.h"
#include "rsvg-css.h"
#include "rsvg-cairo-render.h"
#include <string.h>
#include <math.h>
/*************************************************************/
/*************************************************************/
typedef struct _RsvgFilterPrimitiveOutput RsvgFilterPrimitiveOutput;
struct _RsvgFilterPrimitiveOutput {
cairo_surface_t *surface;
RsvgIRect bounds;
};
typedef struct _RsvgFilterContext RsvgFilterContext;
struct _RsvgFilterContext {
gint width, height;
RsvgFilter *filter;
GHashTable *results;
cairo_surface_t *source_surface;
cairo_surface_t *bg_surface;
RsvgFilterPrimitiveOutput lastresult;
cairo_matrix_t affine;
cairo_matrix_t paffine;
int channelmap[4];
RsvgDrawingCtx *ctx;
};
typedef struct _RsvgFilterPrimitive RsvgFilterPrimitive;
/* We don't have real subclassing here. If you derive something from
* RsvgFilterPrimitive, and don't need any special code to free your
* RsvgFilterPrimitiveFoo structure, you can just set
*
* foo_filter->super.super.free = rsvg_filter_primitive_free;
*
* for the destructor. Otherwise, create a custom destructor like this:
*
* foo_filter->super.super.free = &rsvg_filter_primitive_foo_free;
*
* ...
*
* static void
* rsvg_filter_primitive_foo_free (RsvgNode *self)
* {
* RsvgFilterPrimitiveFoo *foo;
*
* foo = (RsvgFilterPrimitiveFoo *) self;
* g_free (foo->my_custom_stuff);
* g_free (foo->more_custom_stuff);
* ... etc ...
*
* rsvg_filter_primitive_free (self);
* }
*
* That last call to rsvg_filter_primitive_free() will free the base RsvgFilterPrimitive's own fields,
* and your whole structure itself, via _rsvg_node_free().
*/
struct _RsvgFilterPrimitive {
RsvgNode super;
RsvgLength x, y, width, height;
GString *in;
GString *result;
void (*render) (RsvgFilterPrimitive * self, RsvgFilterContext * ctx);
};
/*************************************************************/
/*************************************************************/
static void
rsvg_filter_primitive_free (RsvgNode *self)
{
RsvgFilterPrimitive *primitive;
primitive = (RsvgFilterPrimitive *) self;
g_string_free (primitive->in, TRUE);
g_string_free (primitive->result, TRUE);
_rsvg_node_free (self);
}
static void
rsvg_filter_primitive_render (RsvgFilterPrimitive * self, RsvgFilterContext * ctx)
{
self->render (self, ctx);
}
static RsvgIRect
rsvg_filter_primitive_get_bounds (RsvgFilterPrimitive * self, RsvgFilterContext * ctx)
{
RsvgBbox box, otherbox;
cairo_matrix_t affine;
cairo_matrix_init_identity (&affine);
rsvg_bbox_init (&box, &affine);
rsvg_bbox_init (&otherbox, &ctx->affine);
otherbox.virgin = 0;
if (ctx->filter->filterunits == objectBoundingBox)
_rsvg_push_view_box (ctx->ctx, 1., 1.);
otherbox.rect.x = _rsvg_css_normalize_length (&ctx->filter->x, ctx->ctx, 'h');
otherbox.rect.y = _rsvg_css_normalize_length (&ctx->filter->y, ctx->ctx, 'v');
otherbox.rect.width = _rsvg_css_normalize_length (&ctx->filter->width, ctx->ctx, 'h');
otherbox.rect.height = _rsvg_css_normalize_length (&ctx->filter->height, ctx->ctx, 'v');
if (ctx->filter->filterunits == objectBoundingBox)
_rsvg_pop_view_box (ctx->ctx);
rsvg_bbox_insert (&box, &otherbox);
if (self != NULL)
if (self->x.factor != 'n' || self->y.factor != 'n' ||
self->width.factor != 'n' || self->height.factor != 'n') {
rsvg_bbox_init (&otherbox, &ctx->paffine);
otherbox.virgin = 0;
if (ctx->filter->primitiveunits == objectBoundingBox)
_rsvg_push_view_box (ctx->ctx, 1., 1.);
if (self->x.factor != 'n')
otherbox.rect.x = _rsvg_css_normalize_length (&self->x, ctx->ctx, 'h');
else
otherbox.rect.x = 0;
if (self->y.factor != 'n')
otherbox.rect.y = _rsvg_css_normalize_length (&self->y, ctx->ctx, 'v');
else
otherbox.rect.y = 0;
if (self->width.factor != 'n')
otherbox.rect.width = _rsvg_css_normalize_length (&self->width, ctx->ctx, 'h');
else
otherbox.rect.width = ctx->ctx->vb.rect.width;
if (self->height.factor != 'n')
otherbox.rect.height = _rsvg_css_normalize_length (&self->height, ctx->ctx, 'v');
else
otherbox.rect.height = ctx->ctx->vb.rect.height;
if (ctx->filter->primitiveunits == objectBoundingBox)
_rsvg_pop_view_box (ctx->ctx);
rsvg_bbox_clip (&box, &otherbox);
}
rsvg_bbox_init (&otherbox, &affine);
otherbox.virgin = 0;
otherbox.rect.x = 0;
otherbox.rect.y = 0;
otherbox.rect.width = ctx->width;
otherbox.rect.height = ctx->height;
rsvg_bbox_clip (&box, &otherbox);
{
RsvgIRect output = { box.rect.x, box.rect.y,
box.rect.x + box.rect.width,
box.rect.y + box.rect.height
};
return output;
}
}
static cairo_surface_t *
_rsvg_image_surface_new (int width, int height)
{
cairo_surface_t *surface;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy (surface);
return NULL;
}
return surface;
}
static guchar
get_interp_pixel (guchar * src, gdouble ox, gdouble oy, guchar ch, RsvgIRect boundarys,
guint rowstride)
{
double xmod, ymod;
double dist1, dist2, dist3, dist4;
double c, c1, c2, c3, c4;
double fox, foy, cox, coy;
xmod = fmod (ox, 1.0);
ymod = fmod (oy, 1.0);
dist1 = (1 - xmod) * (1 - ymod);
dist2 = (xmod) * (1 - ymod);
dist3 = (xmod) * (ymod);
dist4 = (1 - xmod) * (ymod);
fox = floor (ox);
foy = floor (oy);
cox = ceil (ox);
coy = ceil (oy);
if (fox <= boundarys.x0 || fox >= boundarys.x1 ||
foy <= boundarys.y0 || foy >= boundarys.y1)
c1 = 0;
else
c1 = src[(guint) foy * rowstride + (guint) fox * 4 + ch];
if (cox <= boundarys.x0 || cox >= boundarys.x1 ||
foy <= boundarys.y0 || foy >= boundarys.y1)
c2 = 0;
else
c2 = src[(guint) foy * rowstride + (guint) cox * 4 + ch];
if (cox <= boundarys.x0 || cox >= boundarys.x1 ||
coy <= boundarys.y0 || coy >= boundarys.y1)
c3 = 0;
else
c3 = src[(guint) coy * rowstride + (guint) cox * 4 + ch];
if (fox <= boundarys.x0 || fox >= boundarys.x1 ||
coy <= boundarys.y0 || coy >= boundarys.y1)
c4 = 0;
else
c4 = src[(guint) coy * rowstride + (guint) fox * 4 + ch];
c = (c1 * dist1 + c2 * dist2 + c3 * dist3 + c4 * dist4) / (dist1 + dist2 + dist3 + dist4);
return (guchar) c;
}
static void
rsvg_filter_fix_coordinate_system (RsvgFilterContext * ctx, RsvgState * state, RsvgBbox *bbox)
{
int x, y, height, width;
x = bbox->rect.x;
y = bbox->rect.y;
width = bbox->rect.width;
height = bbox->rect.height;
ctx->width = cairo_image_surface_get_width (ctx->source_surface);
ctx->height = cairo_image_surface_get_height (ctx->source_surface);
ctx->affine = state->affine;
if (ctx->filter->filterunits == objectBoundingBox) {
cairo_matrix_t affine;
cairo_matrix_init (&affine, width, 0, 0, height, x, y);
cairo_matrix_multiply (&ctx->affine, &affine, &ctx->affine);
}
ctx->paffine = state->affine;
if (ctx->filter->primitiveunits == objectBoundingBox) {
cairo_matrix_t affine;
cairo_matrix_init (&affine, width, 0, 0, height, x, y);
cairo_matrix_multiply (&ctx->paffine, &affine, &ctx->paffine);
}
}
static gboolean
rectangle_intersect (gint ax, gint ay, gint awidth, gint aheight,
gint bx, gint by, gint bwidth, gint bheight,
gint *rx, gint *ry, gint *rwidth, gint *rheight)
{
gint rx1, ry1, rx2, ry2;
rx1 = MAX (ax, bx);
ry1 = MAX (ay, by);
rx2 = MIN (ax + awidth, bx + bwidth);
ry2 = MIN (ay + aheight, by + bheight);
if (rx2 > rx1 && ry2 > ry1) {
*rx = rx1;
*ry = ry1;
*rwidth = rx2 - rx1;
*rheight = ry2 - ry1;
return TRUE;
} else {
*rx = *ry = *rwidth = *rheight = 0;
return FALSE;
}
}
static void
rsvg_alpha_blt (cairo_surface_t *src,
gint srcx,
gint srcy,
gint srcwidth,
gint srcheight,
cairo_surface_t *dst,
gint dstx,
gint dsty)
{
gint src_surf_width, src_surf_height;
gint dst_surf_width, dst_surf_height;
gint src_clipped_x, src_clipped_y, src_clipped_width, src_clipped_height;
gint dst_clipped_x, dst_clipped_y, dst_clipped_width, dst_clipped_height;
gint x, y, srcrowstride, dstrowstride, sx, sy, dx, dy;
guchar *src_pixels, *dst_pixels;
g_assert (cairo_image_surface_get_format (src) == CAIRO_FORMAT_ARGB32);
g_assert (cairo_image_surface_get_format (dst) == CAIRO_FORMAT_ARGB32);
cairo_surface_flush (src);
src_surf_width = cairo_image_surface_get_width (src);
src_surf_height = cairo_image_surface_get_height (src);
dst_surf_width = cairo_image_surface_get_width (dst);
dst_surf_height = cairo_image_surface_get_height (dst);
if (!rectangle_intersect (0, 0, src_surf_width, src_surf_height,
srcx, srcy, srcwidth, srcheight,
&src_clipped_x, &src_clipped_y, &src_clipped_width, &src_clipped_height))
return; /* source rectangle is not in source surface */
if (!rectangle_intersect (0, 0, dst_surf_width, dst_surf_height,
dstx, dsty, src_clipped_width, src_clipped_height,
&dst_clipped_x, &dst_clipped_y, &dst_clipped_width, &dst_clipped_height))
return; /* dest rectangle is not in dest surface */
srcrowstride = cairo_image_surface_get_stride (src);
dstrowstride = cairo_image_surface_get_stride (dst);
src_pixels = cairo_image_surface_get_data (src);
dst_pixels = cairo_image_surface_get_data (dst);
for (y = 0; y < dst_clipped_height; y++)
for (x = 0; x < dst_clipped_width; x++) {
guint a, c, ad, cd, ar, cr, i;
sx = x + src_clipped_x;
sy = y + src_clipped_y;
dx = x + dst_clipped_x;
dy = y + dst_clipped_y;
a = src_pixels[4 * sx + sy * srcrowstride + 3];
if (a) {
ad = dst_pixels[4 * dx + dy * dstrowstride + 3];
ar = a + ad * (255 - a) / 255;
dst_pixels[4 * dx + dy * dstrowstride + 3] = ar;
for (i = 0; i < 3; i++) {
c = src_pixels[4 * sx + sy * srcrowstride + i];
cd = dst_pixels[4 * dx + dy * dstrowstride + i];
cr = c + cd * (255 - a) / 255;
dst_pixels[4 * dx + dy * dstrowstride + i] = cr;
}
}
}
cairo_surface_mark_dirty (dst);
}
static gboolean
rsvg_art_affine_image (cairo_surface_t *img,
cairo_surface_t *intermediate,
cairo_matrix_t *affine,
double w,
double h)
{
cairo_matrix_t inv_affine, raw_inv_affine;
gint intstride;
gint basestride;
gint basex, basey;
gdouble fbasex, fbasey;
gdouble rawx, rawy;
guchar *intpix;
guchar *basepix;
gint i, j, k, basebpp, ii, jj;
gboolean has_alpha;
gdouble pixsum[4];
gboolean xrunnoff, yrunnoff;
gint iwidth, iheight;
gint width, height;
g_assert (cairo_image_surface_get_format (intermediate) == CAIRO_FORMAT_ARGB32);
cairo_surface_flush (img);
width = cairo_image_surface_get_width (img);
height = cairo_image_surface_get_height (img);
iwidth = cairo_image_surface_get_width (intermediate);
iheight = cairo_image_surface_get_height (intermediate);
has_alpha = cairo_image_surface_get_format (img) == CAIRO_FORMAT_ARGB32;
basestride = cairo_image_surface_get_stride (img);
intstride = cairo_image_surface_get_stride (intermediate);
basepix = cairo_image_surface_get_data (img);
intpix = cairo_image_surface_get_data (intermediate);
basebpp = has_alpha ? 4 : 3;
raw_inv_affine = *affine;
if (cairo_matrix_invert (&raw_inv_affine) != CAIRO_STATUS_SUCCESS)
return FALSE;
cairo_matrix_init_scale (&inv_affine, w, h);
cairo_matrix_multiply (&inv_affine, &inv_affine, affine);
if (cairo_matrix_invert (&inv_affine) != CAIRO_STATUS_SUCCESS)
return FALSE;
/*apply the transformation */
for (i = 0; i < iwidth; i++)
for (j = 0; j < iheight; j++) {
fbasex = (inv_affine.xx * (double) i + inv_affine.xy * (double) j +
inv_affine.x0) * (double) width;
fbasey = (inv_affine.yx * (double) i + inv_affine.yy * (double) j +
inv_affine.y0) * (double) height;
basex = floor (fbasex);
basey = floor (fbasey);
rawx = raw_inv_affine.xx * i + raw_inv_affine.xy * j + raw_inv_affine.x0;
rawy = raw_inv_affine.yx * i + raw_inv_affine.yy * j + raw_inv_affine.y0;
if (rawx < 0 || rawy < 0 || rawx >= w ||
rawy >= h || basex < 0 || basey < 0 || basex >= width || basey >= height) {
for (k = 0; k < 4; k++)
intpix[i * 4 + j * intstride + k] = 0;
} else {
if (basex < 0 || basex + 1 >= width)
xrunnoff = TRUE;
else
xrunnoff = FALSE;
if (basey < 0 || basey + 1 >= height)
yrunnoff = TRUE;
else
yrunnoff = FALSE;
for (k = 0; k < basebpp; k++)
pixsum[k] = 0;
for (ii = 0; ii < 2; ii++)
for (jj = 0; jj < 2; jj++) {
if (basex + ii < 0 || basey + jj < 0
|| basex + ii >= width || basey + jj >= height);
else {
for (k = 0; k < basebpp; k++) {
pixsum[k] +=
(double) basepix[basebpp * (basex + ii) +
(basey + jj) * basestride + k]
* (xrunnoff ? 1 : fabs (fbasex - (double) (basex + (1 - ii))))
* (yrunnoff ? 1 : fabs (fbasey - (double) (basey + (1 - jj))));
}
}
}
for (k = 0; k < basebpp; k++)
intpix[i * 4 + j * intstride + k] = pixsum[k];
if (!has_alpha)
intpix[i * 4 + j * intstride + 3] = 255;
}
}
/* Don't need cairo_surface_mark_dirty(intermediate) here since
* the only caller does further work and then calls that himself.
*/
return TRUE;
}
static void
rsvg_filter_free_pair (gpointer value)
{
RsvgFilterPrimitiveOutput *output;
output = (RsvgFilterPrimitiveOutput *) value;
cairo_surface_destroy (output->surface);
g_free (output);
}
static void
rsvg_filter_context_free (RsvgFilterContext * ctx)
{
if (!ctx)
return;
if (ctx->bg_surface)
cairo_surface_destroy (ctx->bg_surface);
g_free (ctx);
}
/**
* rsvg_filter_render:
* @self: a pointer to the filter to use
* @source: the a #cairo_surface_t of type %CAIRO_SURFACE_TYPE_IMAGE
* @context: the context
*
* Create a new surface applied the filter. This function will create
* a context for itself, set up the coordinate systems execute all its
* little primatives and then clean up its own mess.
*
* Returns: (transfer full): a new #cairo_surface_t
**/
cairo_surface_t *
rsvg_filter_render (RsvgFilter *self,
cairo_surface_t *source,
RsvgDrawingCtx *context,
RsvgBbox *bounds,
char *channelmap)
{
RsvgFilterContext *ctx;
RsvgFilterPrimitive *current;
guint i;
cairo_surface_t *output;
g_return_val_if_fail (source != NULL, NULL);
g_return_val_if_fail (cairo_surface_get_type (source) == CAIRO_SURFACE_TYPE_IMAGE, NULL);
ctx = g_new (RsvgFilterContext, 1);
ctx->filter = self;
ctx->source_surface = source;
ctx->bg_surface = NULL;
ctx->results = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, rsvg_filter_free_pair);
ctx->ctx = context;
rsvg_filter_fix_coordinate_system (ctx, rsvg_current_state (context), bounds);
ctx->lastresult.surface = cairo_surface_reference (source);
ctx->lastresult.bounds = rsvg_filter_primitive_get_bounds (NULL, ctx);
for (i = 0; i < 4; i++)
ctx->channelmap[i] = channelmap[i] - '0';
for (i = 0; i < self->super.children->len; i++) {
current = g_ptr_array_index (self->super.children, i);
if (RSVG_NODE_IS_FILTER_PRIMITIVE (¤t->super))
rsvg_filter_primitive_render (current, ctx);
}
output = ctx->lastresult.surface;
g_hash_table_destroy (ctx->results);
rsvg_filter_context_free (ctx);
return output;
}
/**
* rsvg_filter_store_result:
* @name: The name of the result
* @result: The pointer to the result
* @ctx: the context that this was called in
*
* Puts the new result into the hash for easy finding later, also
* Stores it as the last result
**/
static void
rsvg_filter_store_output (GString * name, RsvgFilterPrimitiveOutput result, RsvgFilterContext * ctx)
{
RsvgFilterPrimitiveOutput *store;
cairo_surface_destroy (ctx->lastresult.surface);
store = g_new (RsvgFilterPrimitiveOutput, 1);
*store = result;
if (name->str[0] != '\0') {
cairo_surface_reference (result.surface); /* increments the references for the table */
g_hash_table_insert (ctx->results, g_strdup (name->str), store);
}
cairo_surface_reference (result.surface); /* increments the references for the last result */
ctx->lastresult = result;
}
static void
rsvg_filter_store_result (GString * name,
cairo_surface_t *surface,
RsvgFilterContext * ctx)
{
RsvgFilterPrimitiveOutput output;
output.bounds.x0 = 0;
output.bounds.y0 = 0;
output.bounds.x1 = ctx->width;
output.bounds.y1 = ctx->height;
output.surface = surface;
rsvg_filter_store_output (name, output, ctx);
}
static cairo_surface_t *
surface_get_alpha (cairo_surface_t *source,
RsvgFilterContext * ctx)
{
guchar *data;
guchar *pbdata;
gsize i, pbsize;
cairo_surface_t *surface;
if (source == NULL)
return NULL;
cairo_surface_flush (source);
pbsize = cairo_image_surface_get_width (source) *
cairo_image_surface_get_height (source);
surface = _rsvg_image_surface_new (cairo_image_surface_get_width (source),
cairo_image_surface_get_height (source));
if (surface == NULL)
return NULL;
data = cairo_image_surface_get_data (surface);
pbdata = cairo_image_surface_get_data (source);
/* FIXMEchpe: rewrite this into nested width, height loops */
for (i = 0; i < pbsize; i++)
data[i * 4 + ctx->channelmap[3]] = pbdata[i * 4 + ctx->channelmap[3]];
cairo_surface_mark_dirty (surface);
return surface;
}
static cairo_surface_t *
rsvg_compile_bg (RsvgDrawingCtx * ctx)
{
RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
cairo_surface_t *surface;
cairo_t *cr;
GList *i;
surface = _rsvg_image_surface_new (render->width, render->height);
if (surface == NULL)
return NULL;
cr = cairo_create (surface);
for (i = g_list_last (render->cr_stack); i != NULL; i = g_list_previous (i)) {
cairo_t *draw = i->data;
gboolean nest = draw != render->initial_cr;
cairo_set_source_surface (cr, cairo_get_target (draw),
nest ? 0 : -render->offset_x,
nest ? 0 : -render->offset_y);
cairo_paint (cr);
}
cairo_destroy (cr);
return surface;
}
/**
* rsvg_filter_get_bg:
*
* Returns: (transfer none) (nullable): a #cairo_surface_t, or %NULL
*/
static cairo_surface_t *
rsvg_filter_get_bg (RsvgFilterContext * ctx)
{
if (!ctx->bg_surface)
ctx->bg_surface = rsvg_compile_bg (ctx->ctx);
return ctx->bg_surface;
}
/**
* rsvg_filter_get_result:
* @name: The name of the surface
* @ctx: the context that this was called in
*
* Gets a surface for a primitive
*
* Returns: (nullable): a pointer to the result that the name refers to, a special
* surface if the name is a special keyword or %NULL if nothing was found
**/
static RsvgFilterPrimitiveOutput
rsvg_filter_get_result (GString * name, RsvgFilterContext * ctx)
{
RsvgFilterPrimitiveOutput output;
RsvgFilterPrimitiveOutput *outputpointer;
output.bounds.x0 = output.bounds.x1 = output.bounds.y0 = output.bounds.y1 = 0;
if (!strcmp (name->str, "SourceGraphic")) {
output.surface = cairo_surface_reference (ctx->source_surface);
return output;
} else if (!strcmp (name->str, "BackgroundImage")) {
output.surface = rsvg_filter_get_bg (ctx);
if (output.surface)
cairo_surface_reference (output.surface);
return output;
} else if (!strcmp (name->str, "") || !strcmp (name->str, "none")) {
output = ctx->lastresult;
cairo_surface_reference (output.surface);
return output;
} else if (!strcmp (name->str, "SourceAlpha")) {
output.surface = surface_get_alpha (ctx->source_surface, ctx);
return output;
} else if (!strcmp (name->str, "BackgroundAlpha")) {
output.surface = surface_get_alpha (rsvg_filter_get_bg (ctx), ctx);
return output;
}
outputpointer = (RsvgFilterPrimitiveOutput *) (g_hash_table_lookup (ctx->results, name->str));
if (outputpointer != NULL) {
output = *outputpointer;
cairo_surface_reference (output.surface);
return output;
}
output.surface = NULL;
return output;
}
static cairo_surface_t *
rsvg_filter_get_in (GString * name, RsvgFilterContext * ctx)
{
cairo_surface_t *surface;
surface = rsvg_filter_get_result (name, ctx).surface;
if (surface == NULL || cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
return NULL;
}
return surface;
}
static void
rsvg_filter_set_args (RsvgNode * self, RsvgHandle * ctx, RsvgPropertyBag * atts)
{
const char *value;
RsvgFilter *filter;
filter = (RsvgFilter *) self;
if (rsvg_property_bag_size (atts)) {
if ((value = rsvg_property_bag_lookup (atts, "filterUnits"))) {
if (!strcmp (value, "userSpaceOnUse"))
filter->filterunits = userSpaceOnUse;
else
filter->filterunits = objectBoundingBox;
}
if ((value = rsvg_property_bag_lookup (atts, "primitiveUnits"))) {
if (!strcmp (value, "objectBoundingBox"))
filter->primitiveunits = objectBoundingBox;
else
filter->primitiveunits = userSpaceOnUse;
}
if ((value = rsvg_property_bag_lookup (atts, "x")))
filter->x = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "y")))
filter->y = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "width")))
filter->width = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "height")))
filter->height = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "id")))
rsvg_defs_register_name (ctx->priv->defs, value, &filter->super);
}
}
/**
* rsvg_new_filter:
*
* Creates a blank filter and assigns default values to everything
**/
RsvgNode *
rsvg_new_filter (void)
{
RsvgFilter *filter;
filter = g_new (RsvgFilter, 1);
_rsvg_node_init (&filter->super, RSVG_NODE_TYPE_FILTER);
filter->filterunits = objectBoundingBox;
filter->primitiveunits = userSpaceOnUse;
filter->x = _rsvg_css_parse_length ("-10%");
filter->y = _rsvg_css_parse_length ("-10%");
filter->width = _rsvg_css_parse_length ("120%");
filter->height = _rsvg_css_parse_length ("120%");
filter->super.set_atts = rsvg_filter_set_args;
return (RsvgNode *) filter;
}
/*************************************************************/
/*************************************************************/
typedef enum {
normal, multiply, screen, darken, lighten, softlight,
hardlight, colordodge, colorburn, overlay, exclusion,
difference
} RsvgFilterPrimitiveBlendMode;
typedef struct _RsvgFilterPrimitiveBlend RsvgFilterPrimitiveBlend;
struct _RsvgFilterPrimitiveBlend {
RsvgFilterPrimitive super;
RsvgFilterPrimitiveBlendMode mode;
GString *in2;
};
static void
rsvg_filter_blend (RsvgFilterPrimitiveBlendMode mode,
cairo_surface_t *in,
cairo_surface_t *in2,
cairo_surface_t* output,
RsvgIRect boundarys,
int *channelmap)
{
guchar i;
gint x, y;
gint rowstride, rowstride2, rowstrideo, height, width;
guchar *in_pixels;
guchar *in2_pixels;
guchar *output_pixels;
cairo_surface_flush (in);
cairo_surface_flush (in2);
height = cairo_image_surface_get_height (in);
width = cairo_image_surface_get_width (in);
rowstride = cairo_image_surface_get_stride (in);
rowstride2 = cairo_image_surface_get_stride (in2);
rowstrideo = cairo_image_surface_get_stride (output);
output_pixels = cairo_image_surface_get_data (output);
in_pixels = cairo_image_surface_get_data (in);
in2_pixels = cairo_image_surface_get_data (in2);
if (boundarys.x0 < 0)
boundarys.x0 = 0;
if (boundarys.y0 < 0)
boundarys.y0 = 0;
if (boundarys.x1 >= width)
boundarys.x1 = width;
if (boundarys.y1 >= height)
boundarys.y1 = height;
for (y = boundarys.y0; y < boundarys.y1; y++)
for (x = boundarys.x0; x < boundarys.x1; x++) {
double qr, cr, qa, qb, ca, cb, bca, bcb;
int ch;
qa = (double) in_pixels[4 * x + y * rowstride + channelmap[3]] / 255.0;
qb = (double) in2_pixels[4 * x + y * rowstride2 + channelmap[3]] / 255.0;
qr = 1 - (1 - qa) * (1 - qb);
cr = 0;
for (ch = 0; ch < 3; ch++) {
i = channelmap[ch];
ca = (double) in_pixels[4 * x + y * rowstride + i] / 255.0;
cb = (double) in2_pixels[4 * x + y * rowstride2 + i] / 255.0;
/*these are the ca and cb that are used in the non-standard blend functions */
bcb = (1 - qa) * cb + ca;
bca = (1 - qb) * ca + cb;
switch (mode) {
case normal:
cr = (1 - qa) * cb + ca;
break;
case multiply:
cr = (1 - qa) * cb + (1 - qb) * ca + ca * cb;
break;
case screen:
cr = cb + ca - ca * cb;
break;
case darken:
cr = MIN ((1 - qa) * cb + ca, (1 - qb) * ca + cb);
break;
case lighten:
cr = MAX ((1 - qa) * cb + ca, (1 - qb) * ca + cb);
break;
case softlight:
if (bcb < 0.5)
cr = 2 * bca * bcb + bca * bca * (1 - 2 * bcb);
else
cr = sqrt (bca) * (2 * bcb - 1) + (2 * bca) * (1 - bcb);
break;
case hardlight:
if (cb < 0.5)
cr = 2 * bca * bcb;
else
cr = 1 - 2 * (1 - bca) * (1 - bcb);
break;
case colordodge:
if (bcb == 1)
cr = 1;
else
cr = MIN (bca / (1 - bcb), 1);
break;
case colorburn:
if (bcb == 0)
cr = 0;
else
cr = MAX (1 - (1 - bca) / bcb, 0);
break;
case overlay:
if (bca < 0.5)
cr = 2 * bca * bcb;
else
cr = 1 - 2 * (1 - bca) * (1 - bcb);
break;
case exclusion:
cr = bca + bcb - 2 * bca * bcb;
break;
case difference:
cr = abs (bca - bcb);
break;
}
cr *= 255.0;
if (cr > 255)
cr = 255;
if (cr < 0)
cr = 0;
output_pixels[4 * x + y * rowstrideo + i] = (guchar) cr;
}
output_pixels[4 * x + y * rowstrideo + channelmap[3]] = qr * 255.0;
}
cairo_surface_mark_dirty (output);
}
static void
rsvg_filter_primitive_blend_render (RsvgFilterPrimitive * self, RsvgFilterContext * ctx)
{
RsvgIRect boundarys;
RsvgFilterPrimitiveBlend *upself;
cairo_surface_t *output, *in, *in2;
upself = (RsvgFilterPrimitiveBlend *) self;
boundarys = rsvg_filter_primitive_get_bounds (self, ctx);
in = rsvg_filter_get_in (self->in, ctx);
if (in == NULL)
return;
in2 = rsvg_filter_get_in (upself->in2, ctx);
if (in2 == NULL) {
cairo_surface_destroy (in);
return;
}
output = _rsvg_image_surface_new (cairo_image_surface_get_width (in),
cairo_image_surface_get_height (in));
if (output == NULL) {
cairo_surface_destroy (in);
cairo_surface_destroy (in2);
return;
}
rsvg_filter_blend (upself->mode, in, in2, output, boundarys, ctx->channelmap);
rsvg_filter_store_result (self->result, output, ctx);
cairo_surface_destroy (in);
cairo_surface_destroy (in2);
cairo_surface_destroy (output);
}
static void
rsvg_filter_primitive_blend_free (RsvgNode * self)
{
RsvgFilterPrimitiveBlend *blend;
blend = (RsvgFilterPrimitiveBlend *) self;
g_string_free (blend->in2, TRUE);
rsvg_filter_primitive_free (self);
}
static void
rsvg_filter_primitive_blend_set_atts (RsvgNode * node, RsvgHandle * ctx, RsvgPropertyBag * atts)
{
const char *value;
RsvgFilterPrimitiveBlend *filter;
filter = (RsvgFilterPrimitiveBlend *) node;
if (rsvg_property_bag_size (atts)) {
if ((value = rsvg_property_bag_lookup (atts, "mode"))) {
if (!strcmp (value, "multiply"))
filter->mode = multiply;
else if (!strcmp (value, "screen"))
filter->mode = screen;
else if (!strcmp (value, "darken"))
filter->mode = darken;
else if (!strcmp (value, "lighten"))
filter->mode = lighten;
else