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gdk: Add utility for uploading Cairo surfaces to GL

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The surface-to-GL upload logic has become more complicated with the
addition of the GLES code paths; it's more logical to have a public
utility function that can be called from GDK users, instead of copy
pasting the whole thing multiple times.
This commit is contained in:
Emmanuele Bassi 2016-04-25 11:29:14 +01:00
parent 0e2a87a4bc
commit b425cff689
2 changed files with 55 additions and 0 deletions
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7
gdk/gdkcairo.h
View File

@ -83,6 +83,13 @@ void gdk_cairo_draw_from_gl (cairo_t *cr,
GDK_AVAILABLE_IN_3_22
GdkDrawingContext * gdk_cairo_get_drawing_context (cairo_t *cr);
GDK_AVAILABLE_IN_3_22
void gdk_cairo_surface_upload_to_gl (cairo_surface_t *surface,
int target,
int width,
int height,
GdkGLContext *context);
G_END_DECLS
#endif /* __GDK_CAIRO_H__ */

48
gdk/gdkgl.c
View File

@ -814,3 +814,51 @@ gdk_gl_texture_from_surface (cairo_surface_t *surface,
glDisable (GL_SCISSOR_TEST);
glDeleteTextures (1, &texture_id);
}
/**
* gdk_cairo_surface_upload_to_gl:
* @surface: a Cairo surface
* @target: a GL texture target
* @width: the width of the texture @target
* @height: the height of the texture @target
* @context: (nullable): a #GdkGLContext, or %NULL to use the currently
* bound context
*
* Uploads the contents of a Cairo @surface to a GL texture @target.
*
* Since: 3.22
*/
void
gdk_cairo_surface_upload_to_gl (cairo_surface_t *surface,
int target,
int width,
int height,
GdkGLContext *context)
{
cairo_rectangle_int_t rect;
cairo_surface_t *tmp;
double sx, sy;
double device_x_offset, device_y_offset;
g_return_if_fail (surface != NULL);
g_return_if_fail (context == NULL || GDK_IS_GL_CONTEXT (context));
if (context == NULL)
context = gdk_gl_context_get_current ();
cairo_surface_flush (surface);
sx = sy = 1;
cairo_surface_get_device_scale (surface, &sx, &sy);
cairo_surface_get_device_offset (surface, &device_x_offset, &device_y_offset);
rect.x = (int) device_x_offset;
rect.y = (int) device_y_offset;
rect.width = width * sx;
rect.height = height * sx;
tmp = cairo_surface_map_to_image (surface, &rect);
gdk_gl_context_upload_texture (context, tmp, rect.width, rect.height, target);
cairo_surface_unmap_image (surface, tmp);
}