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/*
* Copyright © 2016 Endless
* 2018 Benjamin Otte
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gskcairorenderer.h"
#include "gskdebugprivate.h"
#include "gskrendererprivate.h"
#include "gskrendernodeprivate.h"
#include "gdk/gdktextureprivate.h"
#ifdef G_ENABLE_DEBUG
typedef struct {
GQuark cpu_time;
GQuark gpu_time;
} ProfileTimers;
#endif
struct _GskCairoRenderer
{
GskRenderer parent_instance;
GdkCairoContext *cairo_context;
#ifdef G_ENABLE_DEBUG
ProfileTimers profile_timers;
#endif
};
struct _GskCairoRendererClass
{
GskRendererClass parent_class;
};
G_DEFINE_TYPE (GskCairoRenderer, gsk_cairo_renderer, GSK_TYPE_RENDERER)
static gboolean
gsk_cairo_renderer_realize (GskRenderer *renderer,
GdkSurface *surface,
GError **error)
{
GskCairoRenderer *self = GSK_CAIRO_RENDERER (renderer);
if (surface)
self->cairo_context = gdk_surface_create_cairo_context (surface);
return TRUE;
}
static void
gsk_cairo_renderer_unrealize (GskRenderer *renderer)
{
GskCairoRenderer *self = GSK_CAIRO_RENDERER (renderer);
g_clear_object (&self->cairo_context);
}
static void
gsk_cairo_renderer_do_render (GskRenderer *renderer,
cairo_t *cr,
GskRenderNode *root)
{
#ifdef G_ENABLE_DEBUG
GskCairoRenderer *self = GSK_CAIRO_RENDERER (renderer);
GskProfiler *profiler;
gint64 cpu_time;
#endif
#ifdef G_ENABLE_DEBUG
profiler = gsk_renderer_get_profiler (renderer);
gsk_profiler_timer_begin (profiler, self->profile_timers.cpu_time);
#endif
gsk_render_node_draw (root, cr);
#ifdef G_ENABLE_DEBUG
cpu_time = gsk_profiler_timer_end (profiler, self->profile_timers.cpu_time);
gsk_profiler_timer_set (profiler, self->profile_timers.cpu_time, cpu_time);
gsk_profiler_push_samples (profiler);
#endif
}
static GdkTexture *
gsk_cairo_renderer_render_texture (GskRenderer *renderer,
GskRenderNode *root,
const graphene_rect_t *viewport)
{
GdkTexture *texture;
cairo_surface_t *surface;
cairo_t *cr;
int width, height;
/* limit from cairo's source code */
#define MAX_IMAGE_SIZE 32767
width = ceil (viewport->size.width);
height = ceil (viewport->size.height);
if (width > MAX_IMAGE_SIZE || height > MAX_IMAGE_SIZE)
{
gsize x, y, size, stride;
GBytes *bytes;
guchar *data;
stride = width * 4;
size = stride * height;
data = g_malloc_n (stride, height);
for (y = 0; y < height; y += MAX_IMAGE_SIZE)
{
for (x = 0; x < width; x += MAX_IMAGE_SIZE)
{
texture = gsk_cairo_renderer_render_texture (renderer, root,
&GRAPHENE_RECT_INIT (x, y,
MIN (MAX_IMAGE_SIZE, viewport->size.width - x),
MIN (MAX_IMAGE_SIZE, viewport->size.height - y)));
gdk_texture_download (texture,
data + stride * y + x * 4,
stride);
g_object_unref (texture);
}
}
bytes = g_bytes_new_take (data, size);
texture = gdk_memory_texture_new (width, height, GDK_MEMORY_DEFAULT, bytes, stride);
g_bytes_unref (bytes);
return texture;
}
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create (surface);
cairo_translate (cr, - viewport->origin.x, - viewport->origin.y);
gsk_cairo_renderer_do_render (renderer, cr, root);
cairo_destroy (cr);
texture = gdk_texture_new_for_surface (surface);
cairo_surface_destroy (surface);
return texture;
}
static void
gsk_cairo_renderer_render (GskRenderer *renderer,
GskRenderNode *root,
const cairo_region_t *region)
{
GskCairoRenderer *self = GSK_CAIRO_RENDERER (renderer);
cairo_t *cr;
gdk_draw_context_begin_frame (GDK_DRAW_CONTEXT (self->cairo_context),
region);
cr = gdk_cairo_context_cairo_create (self->cairo_context);
g_return_if_fail (cr != NULL);
#ifdef G_ENABLE_DEBUG
if (GSK_RENDERER_DEBUG_CHECK (renderer, GEOMETRY))
{
GdkSurface *surface = gsk_renderer_get_surface (renderer);
cairo_save (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_rectangle (cr,
0, 0,
gdk_surface_get_width (surface), gdk_surface_get_height (surface));
cairo_set_source_rgba (cr, 0, 0, 0.85, 0.5);
cairo_stroke (cr);
cairo_restore (cr);
}
#endif
gsk_cairo_renderer_do_render (renderer, cr, root);
cairo_destroy (cr);
gdk_draw_context_end_frame (GDK_DRAW_CONTEXT (self->cairo_context));
}
static void
gsk_cairo_renderer_class_init (GskCairoRendererClass *klass)
{
GskRendererClass *renderer_class = GSK_RENDERER_CLASS (klass);
renderer_class->realize = gsk_cairo_renderer_realize;
renderer_class->unrealize = gsk_cairo_renderer_unrealize;
renderer_class->render = gsk_cairo_renderer_render;
renderer_class->render_texture = gsk_cairo_renderer_render_texture;
}
static void
gsk_cairo_renderer_init (GskCairoRenderer *self)
{
#ifdef G_ENABLE_DEBUG
GskProfiler *profiler = gsk_renderer_get_profiler (GSK_RENDERER (self));
self->profile_timers.cpu_time = gsk_profiler_add_timer (profiler, "cpu-time", "CPU time", FALSE, TRUE);
#endif
}
/**
* gsk_cairo_renderer_new:
*
* Creates a new Cairo renderer.
*
* The Cairo renderer is the fallback renderer drawing in ways similar
* to how GTK 3 drew its content. Its primary use is as comparison tool.
*
* The Cairo renderer is incomplete. It cannot render 3D transformed
* content and will instead render an error marker. Its usage should be
* avoided.
*
* Returns: a new Cairo renderer.
**/
GskRenderer *
gsk_cairo_renderer_new (void)
{
return g_object_new (GSK_TYPE_CAIRO_RENDERER, NULL);
}
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