zathura/render.c
2011-09-29 18:51:24 +02:00

345 lines
8.6 KiB
C

/* See LICENSE file for license and copyright information */
#include <math.h>
#include "render.h"
#include "zathura.h"
#include "document.h"
void* render_job(void* data);
bool render(zathura_t* zathura, zathura_page_t* page);
void*
render_job(void* data)
{
render_thread_t* render_thread = (render_thread_t*) data;
while (true) {
g_mutex_lock(render_thread->lock);
if (girara_list_size(render_thread->list) <= 0) {
g_cond_wait(render_thread->cond, render_thread->lock);
}
if (girara_list_size(render_thread->list) <= 0) {
/*
* We've been signaled with g_cond_signal(), but the list
* is still empty. This means that the signal came from
* render_free() and current document is being closed.
* We should unlock the mutex and kill the thread.
*/
g_mutex_unlock(render_thread->lock);
g_thread_exit(0);
}
zathura_page_t* page = (zathura_page_t*) girara_list_nth(render_thread->list, 0);
girara_list_remove(render_thread->list, page);
g_mutex_unlock(render_thread->lock);
if (render(render_thread->zathura, page) != true) {
girara_error("Rendering failed\n");
}
}
return NULL;
}
render_thread_t*
render_init(zathura_t* zathura)
{
render_thread_t* render_thread = malloc(sizeof(render_thread_t));
if (!render_thread) {
goto error_ret;
}
/* init */
render_thread->list = NULL;
render_thread->thread = NULL;
render_thread->cond = NULL;
render_thread->zathura = zathura;
/* setup */
render_thread->list = girara_list_new();
if (!render_thread->list) {
goto error_free;
}
render_thread->cond = g_cond_new();
if (!render_thread->cond) {
goto error_free;
}
render_thread->lock = g_mutex_new();
if (!render_thread->lock) {
goto error_free;
}
render_thread->thread = g_thread_create(render_job, render_thread, TRUE, NULL);
if (!render_thread->thread) {
goto error_free;
}
return render_thread;
error_free:
if (render_thread->list) {
girara_list_free(render_thread->list);
}
if (render_thread->cond) {
g_cond_free(render_thread->cond);
}
if (render_thread->lock) {
g_mutex_free(render_thread->lock);
}
free(render_thread);
error_ret:
return NULL;
}
void
render_free(render_thread_t* render_thread)
{
if (!render_thread) {
return;
}
if (render_thread->list) {
girara_list_free(render_thread->list);
}
if (render_thread->cond) {
g_cond_signal(render_thread->cond);
g_thread_join(render_thread->thread);
g_cond_free(render_thread->cond);
}
if (render_thread->lock) {
g_mutex_free(render_thread->lock);
}
}
bool
render_page(render_thread_t* render_thread, zathura_page_t* page)
{
if (!render_thread || !page || !render_thread->list || page->surface) {
return false;
}
g_mutex_lock(render_thread->lock);
if (!girara_list_contains(render_thread->list, page)) {
girara_list_append(render_thread->list, page);
}
g_cond_signal(render_thread->cond);
g_mutex_unlock(render_thread->lock);
return true;
}
bool
render(zathura_t* zathura, zathura_page_t* page)
{
if (zathura == NULL || page == NULL) {
return false;
}
gdk_threads_enter();
g_static_mutex_lock(&(page->lock));
/* create cairo surface */
unsigned int page_width = 0;
unsigned int page_height = 0;
if (page->document->rotate == 0 || page->document->rotate == 180) {
page_width = page->width * zathura->document->scale;
page_height = page->height * zathura->document->scale;
} else {
page_width = page->height * zathura->document->scale;
page_height = page->width * zathura->document->scale;
}
cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, page_width, page_height);
if (surface == NULL) {
g_static_mutex_unlock(&(page->lock));
gdk_threads_leave();
return false;
}
cairo_t* cairo = cairo_create(surface);
if (cairo == NULL) {
cairo_surface_destroy(surface);
g_static_mutex_unlock(&(page->lock));
gdk_threads_leave();
return false;
}
cairo_save(cairo);
cairo_set_source_rgb(cairo, 1, 1, 1);
cairo_rectangle(cairo, 0, 0, page_width, page_height);
cairo_fill(cairo);
cairo_restore(cairo);
cairo_save(cairo);
switch(page->document->rotate) {
case 90:
cairo_translate(cairo, page_width, 0);
break;
case 180:
cairo_translate(cairo, page_width, page_height);
break;
case 270:
cairo_translate(cairo, 0, page_height);
break;
}
if (fabs(zathura->document->scale - 1.0f) > FLT_EPSILON) {
cairo_scale(cairo, zathura->document->scale, zathura->document->scale);
}
if (page->document->rotate != 0) {
cairo_rotate(cairo, page->document->rotate * G_PI / 180.0);
}
if (zathura_page_render(page, cairo) == false) {
cairo_destroy(cairo);
cairo_surface_destroy(surface);
g_static_mutex_unlock(&(page->lock));
gdk_threads_leave();
return false;
}
cairo_restore(cairo);
cairo_destroy(cairo);
int rowstride = cairo_image_surface_get_stride(surface);
unsigned char* image = cairo_image_surface_get_data(surface);
/* recolor */
if (zathura->global.recolor) {
/* recolor code based on qimageblitz library flatten() function
(http://sourceforge.net/projects/qimageblitz/) */
int r1 = zathura->ui.colors.recolor_dark_color.red / 257;
int g1 = zathura->ui.colors.recolor_dark_color.green / 257;
int b1 = zathura->ui.colors.recolor_dark_color.blue / 257;
int r2 = zathura->ui.colors.recolor_light_color.red / 257;
int g2 = zathura->ui.colors.recolor_light_color.green / 257;
int b2 = zathura->ui.colors.recolor_light_color.blue / 257;
int min = 0x00;
int max = 0xFF;
int mean = 0x00;
float sr = ((float) r2 - r1) / (max - min);
float sg = ((float) g2 - g1) / (max - min);
float sb = ((float) b2 - b1) / (max - min);
for (unsigned int y = 0; y < page_height; y++) {
unsigned char* data = image + y * rowstride;
for (unsigned int x = 0; x < page_width; x++) {
mean = (data[0] + data[1] + data[2]) / 3;
data[2] = sr * (mean - min) + r1 + 0.5;
data[1] = sg * (mean - min) + g1 + 0.5;
data[0] = sb * (mean - min) + b1 + 0.5;
data += 4;
}
}
}
/* draw to gtk widget */
page->surface = surface;
gtk_widget_set_size_request(page->drawing_area, page_width, page_height);
gtk_widget_queue_draw(page->drawing_area);
g_static_mutex_unlock(&(page->lock));
gdk_threads_leave();
return true;
}
void
render_all(zathura_t* zathura)
{
if (zathura->document == NULL) {
return;
}
/* unmark all pages */
for (unsigned int page_id = 0; page_id < zathura->document->number_of_pages; page_id++) {
cairo_surface_destroy(zathura->document->pages[page_id]->surface);
zathura->document->pages[page_id]->surface = NULL;
}
/* redraw current page */
GtkAdjustment* view_vadjustment = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
cb_view_vadjustment_value_changed(view_vadjustment, zathura);
}
gboolean
page_expose_event(GtkWidget* UNUSED(widget), GdkEventExpose* UNUSED(event),
gpointer data)
{
zathura_page_t* page = data;
if (page == NULL) {
return FALSE;
}
g_static_mutex_lock(&(page->lock));
cairo_t* cairo = gdk_cairo_create(page->drawing_area->window);
if (cairo == NULL) {
girara_error("Could not retreive cairo object");
g_static_mutex_unlock(&(page->lock));
return FALSE;
}
if (page->surface != NULL) {
cairo_set_source_surface(cairo, page->surface, 0, 0);
cairo_paint(cairo);
} else {
/* set background color */
cairo_set_source_rgb(cairo, 255, 255, 255);
cairo_rectangle(cairo, 0, 0, page->width * page->document->scale, page->height * page->document->scale);
cairo_fill(cairo);
/* write text */
cairo_set_source_rgb(cairo, 0, 0, 0);
const char* text = "Loading...";
cairo_select_font_face(cairo, "Sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(cairo, 16.0);
cairo_text_extents_t extents;
cairo_text_extents(cairo, text, &extents);
double x = (page->width * page->document->scale) / 2 - (extents.width / 2 + extents.x_bearing);
double y = (page->height * page->document->scale) / 2 - (extents.height / 2 + extents.y_bearing);
cairo_move_to(cairo, x, y);
cairo_show_text(cairo, text);
/* render real page */
render_page(page->document->zathura->sync.render_thread, page);
/* update statusbar */
}
cairo_destroy(cairo);
page->document->current_page_number = page->number;
statusbar_page_number_update(page->document->zathura);
g_static_mutex_unlock(&(page->lock));
return TRUE;
}