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/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
#include "config.h"
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <util/gv_ftell.h>
#include <util/gv_math.h>
#include <util/prisize_t.h>
#include <gvc/gvplugin_loadimage.h>
#include <gvc/gvio.h>
#ifdef HAVE_WEBP
#ifdef HAVE_PANGOCAIRO
#include <cairo.h>
#include <webp/decode.h>
static const char* const kStatusMessages[] = {
"OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
"UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
};
enum {
FORMAT_WEBP_CAIRO,
};
static void webp_freeimage(usershape_t *us)
{
cairo_surface_destroy(us->data);
}
static cairo_surface_t* webp_really_loadimage(const char *in_file, FILE* const in)
{
WebPDecoderConfig config;
WebPDecBuffer* const output_buffer = &config.output;
WebPBitstreamFeatures* const bitstream = &config.input;
VP8StatusCode status = VP8_STATUS_OK;
cairo_surface_t *surface = NULL; /* source surface */
int ok;
void* data = NULL;
if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Error: WebP library version mismatch!\n");
return NULL;
}
fseek(in, 0, SEEK_END);
const size_t data_size = gv_ftell(in);
rewind(in);
data = malloc(data_size);
ok = data_size == 0 || (data != NULL && fread(data, data_size, 1, in) == 1);
if (!ok) {
fprintf(stderr, "Error: WebP could not read %" PRISIZE_T
" bytes of data from %s\n", data_size, in_file);
free(data);
return NULL;
}
status = WebPGetFeatures(data, data_size, bitstream);
if (status != VP8_STATUS_OK) {
goto end;
}
output_buffer->colorspace = MODE_RGBA;
status = WebPDecode(data, data_size, &config);
/* FIXME - this is ugly */
if (! bitstream->has_alpha) {
assert(output_buffer->width >= 0);
assert(output_buffer->height >= 0);
argb2rgba((size_t)output_buffer->width, (size_t)output_buffer->height,
output_buffer->u.RGBA.rgba);
}
end:
free(data);
ok = status == VP8_STATUS_OK;
if (!ok) {
fprintf(stderr, "Error: WebP decoding of %s failed.\n", in_file);
fprintf(stderr, "Status: %d (%s)\n", status, kStatusMessages[status]);
return NULL;
}
surface = cairo_image_surface_create_for_data (
output_buffer->u.RGBA.rgba,
CAIRO_FORMAT_ARGB32,
output_buffer->width,
output_buffer->height,
output_buffer->u.RGBA.stride);
return surface;
}
// get image either from cached surface, or from freshly loaded surface
static cairo_surface_t *webp_loadimage(usershape_t *us) {
cairo_surface_t *surface = NULL; /* source surface */
assert(us);
assert(us->name);
if (us->data) {
if (us->datafree == webp_freeimage)
surface = us->data; /* use cached data */
else {
us->datafree(us); /* free incompatible cache data */
us->datafree = NULL;
us->data = NULL;
}
}
if (!surface) { /* read file into cache */
if (!gvusershape_file_access(us))
return NULL;
switch (us->type) {
case FT_WEBP:
if ((surface = webp_really_loadimage(us->name, us->f)))
cairo_surface_reference(surface);
break;
default:
surface = NULL;
}
if (surface) {
us->data = surface;
us->datafree = webp_freeimage;
}
gvusershape_file_release(us);
}
return surface;
}
/* paint image into required location in graph */
static void webp_loadimage_cairo(GVJ_t * job, usershape_t *us, boxf b, bool filled)
{
(void)filled;
cairo_t *cr = job->context; /* target context */
cairo_surface_t *surface; /* source surface */
surface = webp_loadimage(us);
if (surface) {
cairo_save(cr);
cairo_translate(cr, b.LL.x, -b.UR.y);
cairo_scale(cr, (b.UR.x - b.LL.x) / us->w, (b.UR.y - b.LL.y) / us->h);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_restore(cr);
}
}
static gvloadimage_engine_t engine_webp = {
webp_loadimage_cairo
};
#endif
#endif
gvplugin_installed_t gvloadimage_webp_types[] = {
#ifdef HAVE_WEBP
#ifdef HAVE_PANGOCAIRO
{FORMAT_WEBP_CAIRO, "webp:cairo", 1, &engine_webp, NULL},
#endif
#endif
{0, NULL, 0, NULL, NULL}
};
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