271 lines
8.2 KiB
C
271 lines
8.2 KiB
C
|
/* GdkPixbuf library - convert X drawable information to RGB
|
||
|
|
*
|
||
|
|
* Copyright (C) 1999 Michael Zucchi
|
||
|
|
*
|
||
|
|
* Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
|
||
|
|
* Cody Russell <bratsche@dfw.net>
|
||
|
|
* Federico Mena-Quintero <federico@gimp.org>
|
||
|
|
*
|
||
|
|
* 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 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/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
|
||
|
|
#include "gdkpixbuf.h"
|
||
|
|
|
||
|
|
#include "gdkmemoryformatprivate.h"
|
||
|
|
#include "gdkmemorytextureprivate.h"
|
||
|
|
#include "gdksurface.h"
|
||
|
|
#include "gdktexturedownloaderprivate.h"
|
||
|
|
|
||
|
|
#include <gdk-pixbuf/gdk-pixbuf.h>
|
||
|
|
|
||
|
|
|
||
|
|
static cairo_format_t
|
||
|
|
gdk_cairo_format_for_content (cairo_content_t content)
|
||
|
|
{
|
||
|
|
switch (content)
|
||
|
|
{
|
||
|
|
case CAIRO_CONTENT_COLOR:
|
||
|
|
return CAIRO_FORMAT_RGB24;
|
||
|
|
case CAIRO_CONTENT_ALPHA:
|
||
|
|
return CAIRO_FORMAT_A8;
|
||
|
|
case CAIRO_CONTENT_COLOR_ALPHA:
|
||
|
|
default:
|
||
|
|
return CAIRO_FORMAT_ARGB32;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static cairo_surface_t *
|
||
|
|
gdk_cairo_surface_coerce_to_image (cairo_surface_t *surface,
|
||
|
|
cairo_content_t content,
|
||
|
|
int src_x,
|
||
|
|
int src_y,
|
||
|
|
int width,
|
||
|
|
int height)
|
||
|
|
{
|
||
|
|
cairo_surface_t *copy;
|
||
|
|
cairo_t *cr;
|
||
|
|
|
||
|
|
copy = cairo_image_surface_create (gdk_cairo_format_for_content (content),
|
||
|
|
width,
|
||
|
|
height);
|
||
|
|
|
||
|
|
cr = cairo_create (copy);
|
||
|
|
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
|
||
|
|
cairo_set_source_surface (cr, surface, -src_x, -src_y);
|
||
|
|
cairo_paint (cr);
|
||
|
|
cairo_destroy (cr);
|
||
|
|
|
||
|
|
return copy;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
convert_alpha (guchar *dest_data,
|
||
|
|
int dest_stride,
|
||
|
|
guchar *src_data,
|
||
|
|
int src_stride,
|
||
|
|
int src_x,
|
||
|
|
int src_y,
|
||
|
|
int width,
|
||
|
|
int height)
|
||
|
|
{
|
||
|
|
int x, y;
|
||
|
|
|
||
|
|
src_data += src_stride * src_y + src_x * 4;
|
||
|
|
|
||
|
|
for (y = 0; y < height; y++) {
|
||
|
|
guint32 *src = (guint32 *) src_data;
|
||
|
|
|
||
|
|
for (x = 0; x < width; x++) {
|
||
|
|
guint alpha = src[x] >> 24;
|
||
|
|
|
||
|
|
if (alpha == 0)
|
||
|
|
{
|
||
|
|
dest_data[x * 4 + 0] = 0;
|
||
|
|
dest_data[x * 4 + 1] = 0;
|
||
|
|
dest_data[x * 4 + 2] = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
dest_data[x * 4 + 0] = (((src[x] & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
|
||
|
|
dest_data[x * 4 + 1] = (((src[x] & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
|
||
|
|
dest_data[x * 4 + 2] = (((src[x] & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
|
||
|
|
}
|
||
|
|
dest_data[x * 4 + 3] = alpha;
|
||
|
|
}
|
||
|
|
|
||
|
|
src_data += src_stride;
|
||
|
|
dest_data += dest_stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
convert_no_alpha (guchar *dest_data,
|
||
|
|
int dest_stride,
|
||
|
|
guchar *src_data,
|
||
|
|
int src_stride,
|
||
|
|
int src_x,
|
||
|
|
int src_y,
|
||
|
|
int width,
|
||
|
|
int height)
|
||
|
|
{
|
||
|
|
int x, y;
|
||
|
|
|
||
|
|
src_data += src_stride * src_y + src_x * 4;
|
||
|
|
|
||
|
|
for (y = 0; y < height; y++) {
|
||
|
|
guint32 *src = (guint32 *) src_data;
|
||
|
|
|
||
|
|
for (x = 0; x < width; x++) {
|
||
|
|
dest_data[x * 3 + 0] = src[x] >> 16;
|
||
|
|
dest_data[x * 3 + 1] = src[x] >> 8;
|
||
|
|
dest_data[x * 3 + 2] = src[x];
|
||
|
|
}
|
||
|
|
|
||
|
|
src_data += src_stride;
|
||
|
|
dest_data += dest_stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* gdk_pixbuf_get_from_surface:
|
||
|
|
* @surface: surface to copy from
|
||
|
|
* @src_x: Source X coordinate within @surface
|
||
|
|
* @src_y: Source Y coordinate within @surface
|
||
|
|
* @width: Width in pixels of region to get
|
||
|
|
* @height: Height in pixels of region to get
|
||
|
|
*
|
||
|
|
* Transfers image data from a `cairo_surface_t` and converts it
|
||
|
|
* to a `GdkPixbuf`.
|
||
|
|
*
|
||
|
|
* This allows you to efficiently read individual pixels from cairo surfaces.
|
||
|
|
*
|
||
|
|
* This function will create an RGB pixbuf with 8 bits per channel.
|
||
|
|
* The pixbuf will contain an alpha channel if the @surface contains one.
|
||
|
|
*
|
||
|
|
* Returns: (nullable) (transfer full): A newly-created pixbuf with a
|
||
|
|
* reference count of 1
|
||
|
|
*
|
||
|
|
* Deprecated: 4.12: Use [class@Gdk.Texture] and subclasses instead
|
||
|
|
* cairo surfaces and pixbufs
|
||
|
|
*/
|
||
|
|
GdkPixbuf *
|
||
|
|
gdk_pixbuf_get_from_surface (cairo_surface_t *surface,
|
||
|
|
int src_x,
|
||
|
|
int src_y,
|
||
|
|
int width,
|
||
|
|
int height)
|
||
|
|
{
|
||
|
|
cairo_content_t content;
|
||
|
|
GdkPixbuf *dest;
|
||
|
|
|
||
|
|
/* General sanity checks */
|
||
|
|
g_return_val_if_fail (surface != NULL, NULL);
|
||
|
|
g_return_val_if_fail (width > 0 && height > 0, NULL);
|
||
|
|
|
||
|
|
content = cairo_surface_get_content (surface) | CAIRO_CONTENT_COLOR;
|
||
|
|
dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
|
||
|
|
!!(content & CAIRO_CONTENT_ALPHA),
|
||
|
|
8,
|
||
|
|
width, height);
|
||
|
|
|
||
|
|
if (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE &&
|
||
|
|
cairo_image_surface_get_format (surface) == gdk_cairo_format_for_content (content))
|
||
|
|
surface = cairo_surface_reference (surface);
|
||
|
|
else
|
||
|
|
{
|
||
|
|
surface = gdk_cairo_surface_coerce_to_image (surface, content,
|
||
|
|
src_x, src_y,
|
||
|
|
width, height);
|
||
|
|
src_x = 0;
|
||
|
|
src_y = 0;
|
||
|
|
}
|
||
|
|
cairo_surface_flush (surface);
|
||
|
|
if (cairo_surface_status (surface) || dest == NULL)
|
||
|
|
{
|
||
|
|
cairo_surface_destroy (surface);
|
||
|
|
g_clear_object (&dest);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (gdk_pixbuf_get_has_alpha (dest))
|
||
|
|
convert_alpha (gdk_pixbuf_get_pixels (dest),
|
||
|
|
gdk_pixbuf_get_rowstride (dest),
|
||
|
|
cairo_image_surface_get_data (surface),
|
||
|
|
cairo_image_surface_get_stride (surface),
|
||
|
|
src_x, src_y,
|
||
|
|
width, height);
|
||
|
|
else
|
||
|
|
convert_no_alpha (gdk_pixbuf_get_pixels (dest),
|
||
|
|
gdk_pixbuf_get_rowstride (dest),
|
||
|
|
cairo_image_surface_get_data (surface),
|
||
|
|
cairo_image_surface_get_stride (surface),
|
||
|
|
src_x, src_y,
|
||
|
|
width, height);
|
||
|
|
|
||
|
|
cairo_surface_destroy (surface);
|
||
|
|
return dest;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
pixbuf_texture_unref_cb (guchar *pixels,
|
||
|
|
gpointer bytes)
|
||
|
|
{
|
||
|
|
g_bytes_unref (bytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* gdk_pixbuf_get_from_texture:
|
||
|
|
* @texture: a `GdkTexture`
|
||
|
|
*
|
||
|
|
* Creates a new pixbuf from @texture.
|
||
|
|
*
|
||
|
|
* This should generally not be used in newly written code as later
|
||
|
|
* stages will almost certainly convert the pixbuf back into a texture
|
||
|
|
* to draw it on screen.
|
||
|
|
*
|
||
|
|
* Returns: (transfer full) (nullable): a new `GdkPixbuf`
|
||
|
|
*
|
||
|
|
* Deprecated: 4.12: Use [class@Gdk.Texture] and subclasses instead
|
||
|
|
* cairo surfaces and pixbufs
|
||
|
|
*/
|
||
|
|
GdkPixbuf *
|
||
|
|
gdk_pixbuf_get_from_texture (GdkTexture *texture)
|
||
|
|
{
|
||
|
|
GdkTextureDownloader downloader;
|
||
|
|
GBytes *bytes;
|
||
|
|
gsize stride;
|
||
|
|
gboolean alpha;
|
||
|
|
|
||
|
|
alpha = gdk_memory_format_alpha (gdk_texture_get_format (texture)) != GDK_MEMORY_ALPHA_OPAQUE;
|
||
|
|
|
||
|
|
gdk_texture_downloader_init (&downloader, texture);
|
||
|
|
gdk_texture_downloader_set_format (&downloader,
|
||
|
|
alpha ? GDK_MEMORY_GDK_PIXBUF_ALPHA
|
||
|
|
: GDK_MEMORY_GDK_PIXBUF_OPAQUE);
|
||
|
|
bytes = gdk_texture_downloader_download_bytes (&downloader, &stride);
|
||
|
|
gdk_texture_downloader_finish (&downloader);
|
||
|
|
|
||
|
|
return gdk_pixbuf_new_from_data (g_bytes_get_data (bytes, NULL),
|
||
|
|
GDK_COLORSPACE_RGB,
|
||
|
|
alpha,
|
||
|
|
8,
|
||
|
|
gdk_texture_get_width (texture),
|
||
|
|
gdk_texture_get_height (texture),
|
||
|
|
stride,
|
||
|
|
pixbuf_texture_unref_cb,
|
||
|
|
bytes);
|
||
|
|
}
|