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/* $Id: gvloadimage_pango.c,v 1.17 2009/06/03 01:10:57 ellson Exp $ $Revision: 1.17 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include "gvplugin_loadimage.h"
#include "gvio.h"
#ifdef HAVE_PANGOCAIRO
#include <cairo.h>
typedef enum {
FORMAT_PNG_CAIRO, FORMAT_PNG_PS,
} format_type;
static cairo_status_t
reader (void *closure, unsigned char *data, unsigned int length)
{
if (length == fread(data, 1, length, (FILE *)closure)
|| feof((FILE *)closure))
return CAIRO_STATUS_SUCCESS;
return CAIRO_STATUS_READ_ERROR;
}
static void cairo_freeimage(usershape_t *us)
{
cairo_surface_destroy((cairo_surface_t*)(us->data));
}
static cairo_surface_t* cairo_loadimage(GVJ_t * job, usershape_t *us)
{
cairo_surface_t *surface = NULL; /* source surface */
assert(job);
assert(us);
assert(us->name);
if (us->data) {
if (us->datafree == cairo_freeimage)
surface = (cairo_surface_t*)(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) {
#ifdef CAIRO_HAS_PNG_FUNCTIONS
case FT_PNG:
surface = cairo_image_surface_create_from_png_stream(reader, us->f);
cairo_surface_reference(surface);
break;
#endif
default:
surface = NULL;
}
if (surface) {
us->data = (void*)surface;
us->datafree = cairo_freeimage;
}
gvusershape_file_release(us);
}
return surface;
}
static void pango_loadimage_cairo(GVJ_t * job, usershape_t *us, boxf b, boolean filled)
{
cairo_t *cr = (cairo_t *) job->context; /* target context */
cairo_surface_t *surface; /* source surface */
surface = cairo_loadimage(job, us);
if (surface) {
cairo_save(cr);
cairo_translate(cr,
(b.LL.x + (b.UR.x - b.LL.x) * (1. - (job->dpi.x) / 96.) / 2.),
(-b.UR.y + (b.UR.y - b.LL.y) * (1. - (job->dpi.y) / 96.) / 2.));
cairo_scale(cr,
((b.UR.x - b.LL.x) * (job->dpi.x) / (96. * us->w)),
((b.UR.y - b.LL.y) * (job->dpi.y) / (96. * us->h)));
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_restore(cr);
}
}
static void pango_loadimage_ps(GVJ_t * job, usershape_t *us, boxf b, boolean filled)
{
cairo_surface_t *surface; /* source surface */
cairo_format_t format;
int X, Y, x, y, stride;
unsigned char *data, *ix, alpha, red, green, blue;
surface = cairo_loadimage(job, us);
if (surface) {
format = cairo_image_surface_get_format(surface);
if ((format != CAIRO_FORMAT_ARGB32) && (format != CAIRO_FORMAT_RGB24))
return;
X = cairo_image_surface_get_width(surface);
Y = cairo_image_surface_get_height(surface);
stride = cairo_image_surface_get_stride(surface);
data = cairo_image_surface_get_data(surface);
gvputs(job, "save\n");
/* define image data as string array (one per raster line) */
/* see parallel code in gd_loadimage_ps(). FIXME: refactor... */
gvputs(job, "/myctr 0 def\n");
gvputs(job, "/myarray [\n");
for (y = 0; y < Y; y++) {
gvputs(job, "<");
ix = data + y * stride;
for (x = 0; x < X; x++) {
/* FIXME - this code may have endian problems */
blue = *ix++;
green = *ix++;
red = *ix++;
alpha = *ix++;
if (alpha < 0x7f)
gvputs(job, "ffffff");
else
gvprintf(job, "%02x%02x%02x", red, green, blue);
}
gvputs(job, ">\n");
}
gvputs(job, "] def\n");
gvputs(job,"/myproc { myarray myctr get /myctr myctr 1 add def } def\n");
/* this sets the position of the image */
gvprintf(job, "%g %g translate\n",
(b.LL.x + (b.UR.x - b.LL.x) * (1. - (job->dpi.x) / 96.) / 2.),
(b.LL.y + (b.UR.y - b.LL.y) * (1. - (job->dpi.y) / 96.) / 2.));
/* this sets the rendered size to fit the box */
gvprintf(job,"%g %g scale\n",
((b.UR.x - b.LL.x) * 72. / 96.),
((b.UR.y - b.LL.y) * 72. / 96.));
/* xsize ysize bits-per-sample [matrix] */
gvprintf(job, "%d %d 8 [%d 0 0 %d 0 %d]\n", X, Y, X, -Y, Y);
gvputs(job, "{myproc} false 3 colorimage\n");
gvputs(job, "restore\n");
}
}
static gvloadimage_engine_t engine_cairo = {
pango_loadimage_cairo
};
static gvloadimage_engine_t engine_ps = {
pango_loadimage_ps
};
#endif
gvplugin_installed_t gvloadimage_pango_types[] = {
#ifdef HAVE_PANGOCAIRO
{FORMAT_PNG_CAIRO, "png:cairo", 1, &engine_cairo, NULL},
{FORMAT_PNG_PS, "png:lasi", 2, &engine_ps, NULL},
{FORMAT_PNG_PS, "png:ps", 2, &engine_ps, NULL},
#endif
{0, NULL, 0, NULL, NULL}
};
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