Commit f2848737 authored by Benjamin Otte's avatar Benjamin Otte

gsk: Add gsk_texture_download() API

Now users can download pixels and make everything slooooooow.
parent 8b7261df
......@@ -79,6 +79,7 @@ gsk_texture_new_for_data
gsk_texture_new_for_pixbuf
gsk_texture_get_width
gsk_texture_get_height
gsk_texture_download
<SUBSECTION Standard>
GskTexture
gsk_texture_get_type
......
......@@ -650,7 +650,6 @@ gsk_renderer_render_texture (GskRenderer *renderer,
g_return_val_if_fail (priv->root_node == NULL, NULL);
priv->root_node = gsk_render_node_ref (root);
gsk_render_node_make_immutable (priv->root_node);
if (viewport == NULL)
{
......
......@@ -37,6 +37,8 @@
#include "gskdebugprivate.h"
#include "gskrenderer.h"
#include "gdk/gdkinternals.h"
/**
* GskTexture: (ref-func gsk_texture_ref) (unref-func gsk_texture_unref)
*
......@@ -142,10 +144,35 @@ gsk_texture_cairo_download_surface (GskTexture *texture)
return cairo_surface_reference (cairo->surface);
}
static void
gsk_texture_cairo_download (GskTexture *texture,
guchar *data,
gsize stride)
{
GskCairoTexture *cairo = (GskCairoTexture *) texture;
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
texture->width, texture->height,
stride);
cr = cairo_create (surface);
cairo_set_source_surface (cr, cairo->surface, 0, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_finish (surface);
cairo_surface_destroy (surface);
}
static const GskTextureClass GSK_TEXTURE_CLASS_CAIRO = {
"cairo",
sizeof (GskCairoTexture),
gsk_texture_cairo_finalize,
gsk_texture_cairo_download,
gsk_texture_cairo_download_surface
};
......@@ -208,6 +235,23 @@ gsk_texture_pixbuf_finalize (GskTexture *texture)
g_object_unref (pixbuf->pixbuf);
}
static void
gsk_texture_pixbuf_download (GskTexture *texture,
guchar *data,
gsize stride)
{
GskPixbufTexture *pixbuf = (GskPixbufTexture *) texture;
cairo_surface_t *surface;
surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
texture->width, texture->height,
stride);
gdk_cairo_surface_paint_pixbuf (surface, pixbuf->pixbuf);
cairo_surface_finish (surface);
cairo_surface_destroy (surface);
}
static cairo_surface_t *
gsk_texture_pixbuf_download_surface (GskTexture *texture)
{
......@@ -220,7 +264,8 @@ static const GskTextureClass GSK_TEXTURE_CLASS_PIXBUF = {
"pixbuf",
sizeof (GskPixbufTexture),
gsk_texture_pixbuf_finalize,
gsk_texture_pixbuf_download_surface,
gsk_texture_pixbuf_download,
gsk_texture_pixbuf_download_surface
};
GskTexture *
......@@ -278,7 +323,57 @@ gsk_texture_get_height (GskTexture *texture)
cairo_surface_t *
gsk_texture_download_surface (GskTexture *texture)
{
return texture->klass->download_surface (texture);
cairo_surface_t *surface;
if (texture->klass->download_surface)
return texture->klass->download_surface (texture);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
texture->width, texture->height);
gsk_texture_download (texture,
cairo_image_surface_get_data (surface),
cairo_image_surface_get_stride (surface));
cairo_surface_mark_dirty (surface);
return surface;
}
/**
* gsk_texture_download:
* @texture: a #GskTexture
* @data: pointer to enough memory to be filled with the
* downloaded data of @texture
* @stride: rowstride in bytes
*
* Downloads the @texture into local memory. This may be
* an expensive operation, as the actual texture data may
* reside on a GPU or on a remote display server.
*
* The data format of the downloaded data is equivalent to
* %CAIRO_FORMAT_ARGB32, so every downloaded pixel requires
* 4 bytes of memory.
*
* Downloading a texture into a Cairo image surface:
* |[<!-- language="C" -->
* surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
* gsk_texture_get_width (texture),
* gsk_texture_get_height (texture));
* gsk_texture_download (texture,
* cairo_image_surface_get_data (surface),
* cairo_image_surface_get_stride (surface));
* cairo_surface_mark_dirty (surface);
* ]|
**/
void
gsk_texture_download (GskTexture *texture,
guchar *data,
gsize stride)
{
g_return_if_fail (GSK_IS_TEXTURE (texture));
g_return_if_fail (data != NULL);
g_return_if_fail (stride >= gsk_texture_get_width (texture) * 4);
return texture->klass->download (texture, data, stride);
}
gboolean
......
......@@ -52,6 +52,11 @@ int gsk_texture_get_width (GskTexture
GDK_AVAILABLE_IN_3_90
int gsk_texture_get_height (GskTexture *texture);
GDK_AVAILABLE_IN_3_90
void gsk_texture_download (GskTexture *texture,
guchar *data,
gsize stride);
G_END_DECLS
#endif /* __GSK_TEXTURE_H__ */
......@@ -30,6 +30,9 @@ struct _GskTextureClass {
gsize size;
void (* finalize) (GskTexture *texture);
void (* download) (GskTexture *texture,
guchar *data,
gsize stride);
cairo_surface_t * (* download_surface) (GskTexture *texture);
};
......
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