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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 <glcomp/glcomptexture.h>
#include <glcomp/glpangofont.h>
#include <stddef.h>
#include <stdbool.h>
#include <util/alloc.h>
#include <util/streq.h>
static glCompTex *glCompSetAddNewTexture(glCompSet *s, int width, int height,
const unsigned char *data, bool is2D) {
int offset, ind;
unsigned char *tarData;
if (!data)
return NULL;
glCompTex *t = gv_alloc(sizeof(glCompTex));
if (!is2D) { /*use opengl texture */
glEnable(GL_TEXTURE_2D);
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glGenTextures(1, &t->id); //get next id
if (glGetError() != GL_NO_ERROR) { /*for some opengl based error , texture couldnt be created */
/* drain the OpenGL error queue */
while (glGetError() != GL_NO_ERROR);
free(t);
return NULL;
} else {
glBindTexture(GL_TEXTURE_2D, t->id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, data);
glDisable(GL_TEXTURE_2D);
}
}
if (is2D) {
assert(width >= 0);
assert(height >= 0);
t->data = gv_calloc(4 * (unsigned)width * (unsigned)height,
sizeof(unsigned char));
offset = 4; //RGBA mod,TO DO implement other modes
/*data upside down because of pango gl coord system */
for (ind = 0; ind < height; ind++) {
const unsigned char *srcData = data + (height - 1 - ind) * offset * width;
tarData = t->data + ind * offset * width;
memcpy(tarData, srcData, 4 * (unsigned)width);
}
}
t->userCount = 1;
t->width = width;
t->height = height;
if(s)
{
s->textures =
gv_recalloc(s->textures, s->textureCount, s->textureCount + 1, sizeof(glCompTex *));
s->textureCount++;
s->textures[s->textureCount - 1] = t;
}
return t;
}
glCompTex *glCompSetAddNewTexImage(glCompSet *s, int width, int height,
const unsigned char *data, bool is2D) {
glCompTex *t;
if (!data)
return NULL;
t = glCompSetAddNewTexture(s, width, height, data, is2D);
if (!t)
return NULL;
t->type = glTexImage;
return t;
}
glCompTex *glCompSetAddNewTexLabel(glCompSet *s, char *def, int fs,
const char *text, bool is2D) {
int width, height;
glCompTex *t;
cairo_surface_t *surface = NULL;
unsigned char *data = NULL;
if (!def)
return NULL;
/*first check if the same label with same font def created before
if it was , return its id
*/
for (size_t ind = 0; ind < s->textureCount; ind++) {
if (s->textures[ind]->type == glTexLabel) {
if (streq(def, s->textures[ind]->def)
&& s->textures[ind]->type == glTexLabel
&& streq(text, s->textures[ind]->text)
&& s->textures[ind]->fontSize==fs) {
s->textures[ind]->userCount++;
return s->textures[ind];
}
}
}
data = glCompCreatePangoTexture(def, fs, text, &surface, &width, &height);
if (!data) // pango error
return NULL;
t = glCompSetAddNewTexture(s, width, height, data, is2D);
cairo_surface_destroy(surface);
if (!t) {
free(data);
return NULL;
}
t->def = gv_strdup(def);
t->text = gv_strdup(text);
t->type = glTexLabel;
return t;
}
void glCompDeleteTexture(glCompTex * t)
{
if (!t)
return;
t->userCount--;
if (!t->userCount) {
free(t->data);
free(t->def);
free(t->text);
free(t);
}
}
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