* Author: 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 Library General Public
+ * 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
- * Library General Public License for more details.
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
-#include <config.h>
+#include "config.h"
#include <gdk/gdk.h>
-#include <libart_lgpl/art_rect.h>
-#include "gdk-pixbuf.h"
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include "gdkpixbuf.h"
+#include "gdkscreen.h"
+#include "gdkinternals.h"
-\f
/**
* gdk_pixbuf_render_threshold_alpha:
* @src_y: source Y coordinate.
* @dest_x: Destination X coordinate.
* @dest_y: Destination Y coordinate.
- * @width: Width of region to threshold.
- * @height: Height of region to threshold.
+ * @width: Width of region to threshold, or -1 to use pixbuf width
+ * @height: Height of region to threshold, or -1 to use pixbuf height
* @alpha_threshold: Opacity values below this will be painted as zero; all
* other values will be painted as one.
*
*
**/
void
-gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf, GdkBitmap *bitmap,
- int src_x, int src_y,
- int dest_x, int dest_y,
- int width, int height,
- int alpha_threshold)
+gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
+ GdkBitmap *bitmap,
+ int src_x,
+ int src_y,
+ int dest_x,
+ int dest_y,
+ int width,
+ int height,
+ int alpha_threshold)
{
- ArtPixBuf *apb;
- GdkGC *gc;
- GdkColor color;
- int x, y;
- guchar *p;
- int start, start_status;
- int status;
-
- g_return_if_fail (pixbuf != NULL);
- apb = pixbuf->art_pixbuf;
-
- g_return_if_fail (apb->format == ART_PIX_RGB);
- g_return_if_fail (apb->n_channels == 3 || apb->n_channels == 4);
- g_return_if_fail (apb->bits_per_sample == 8);
-
- g_return_if_fail (bitmap != NULL);
- g_return_if_fail (src_x >= 0 && src_x + width <= apb->width);
- g_return_if_fail (src_y >= 0 && src_y + height <= apb->height);
-
- g_return_if_fail (alpha_threshold >= 0 && alpha_threshold <= 255);
-
- gc = gdk_gc_new (bitmap);
-
- if (!apb->has_alpha) {
- color.pixel = (alpha_threshold == 255) ? 0 : 1;
- gdk_gc_set_foreground (gc, &color);
- gdk_draw_rectangle (bitmap, gc, TRUE, dest_x, dest_y, width, height);
- gdk_gc_unref (gc);
- return;
- }
-
- color.pixel = 0;
- gdk_gc_set_foreground (gc, &color);
- gdk_draw_rectangle (bitmap, gc, TRUE, dest_x, dest_y, width, height);
-
- color.pixel = 1;
- gdk_gc_set_foreground (gc, &color);
-
- for (y = 0; y < height; y++) {
- p = (apb->pixels + (y + src_y) * apb->rowstride + src_x * apb->n_channels
- + apb->n_channels - 1);
-
- start = 0;
- start_status = *p < alpha_threshold;
-
- for (x = 0; x < width; x++) {
- status = *p < alpha_threshold;
-
- if (status != start_status) {
- if (!start_status)
- gdk_draw_line (bitmap, gc,
- start + dest_x, y + dest_y,
- x - 1 + dest_x, y + dest_y);
-
- start = x;
- start_status = status;
- }
-
- p += apb->n_channels;
- }
-
- if (!start_status)
- gdk_draw_line (bitmap, gc,
- start + dest_x, y + dest_y,
- x - 1 + dest_x, y + dest_y);
+ cairo_t *cr;
+ int x, y;
+ guchar *p;
+ int start, start_status;
+ int status;
+
+ g_return_if_fail (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
+ g_return_if_fail (gdk_pixbuf_get_n_channels (pixbuf) == 3 ||
+ gdk_pixbuf_get_n_channels (pixbuf) == 4);
+ g_return_if_fail (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
+
+ if (width == -1)
+ width = gdk_pixbuf_get_width (pixbuf);
+ if (height == -1)
+ height = gdk_pixbuf_get_height (pixbuf);
+
+ g_return_if_fail (bitmap != NULL);
+ g_return_if_fail (width >= 0 && height >= 0);
+ g_return_if_fail (src_x >= 0 && src_x + width <= gdk_pixbuf_get_width (pixbuf));
+ g_return_if_fail (src_y >= 0 && src_y + height <= gdk_pixbuf_get_height (pixbuf));
+
+ g_return_if_fail (alpha_threshold >= 0 && alpha_threshold <= 255);
+
+ if (width == 0 || height == 0)
+ return;
+
+ cr = gdk_cairo_create (bitmap);
+ cairo_rectangle (cr, dest_x, dest_y, width, height);
+ cairo_clip (cr);
+
+ if (!gdk_pixbuf_get_has_alpha (pixbuf))
+ {
+ cairo_set_source_rgba (cr, 0, 0, 0, alpha_threshold == 255 ? 0 : 1);
+ cairo_paint (cr);
+ cairo_destroy (cr);
+ return;
+ }
+
+ cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
+ cairo_paint (cr);
+
+ cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+ if (alpha_threshold == 128)
+ {
+ gdk_cairo_set_source_pixbuf (cr, pixbuf, src_x - dest_x, src_y - dest_y);
+ cairo_paint (cr);
+ cairo_destroy (cr);
+ return;
+ }
+
+ cairo_set_source_rgb (cr, 0, 0, 0);
+
+ for (y = 0; y < height; y++)
+ {
+ p = (gdk_pixbuf_get_pixels (pixbuf) + (y + src_y) * gdk_pixbuf_get_rowstride (pixbuf) + src_x * gdk_pixbuf_get_n_channels (pixbuf)
+ + gdk_pixbuf_get_n_channels (pixbuf) - 1);
+
+ start = 0;
+ start_status = *p < alpha_threshold;
+
+ for (x = 0; x < width; x++)
+ {
+ status = *p < alpha_threshold;
+
+ if (status != start_status)
+ {
+ if (!start_status)
+ cairo_rectangle (cr,
+ start + dest_x, y + dest_y,
+ x + dest_x, y + dest_y + 1);
+
+ start = x;
+ start_status = status;
+ }
+
+ p += gdk_pixbuf_get_n_channels (pixbuf);
}
-
- gdk_gc_unref (gc);
-}
-
-\f
-
-/* Creates a buffer by stripping the alpha channel of a pixbuf */
-static guchar *
-remove_alpha (ArtPixBuf *apb, int x, int y, int width, int height, int *rowstride)
-{
- guchar *buf;
- int xx, yy;
- guchar *src, *dest;
-
- g_assert (apb->n_channels == 4);
- g_assert (apb->has_alpha);
- g_assert (x >= 0 && x + width <= apb->width);
- g_assert (y >= 0 && y + height <= apb->height);
-
- *rowstride = 4 * ((width * 3 + 3) / 4);
-
- buf = g_new (guchar, *rowstride * height);
-
- for (yy = 0; yy < height; yy++) {
- src = apb->pixels + apb->rowstride * (yy + y) + x * apb->n_channels;
- dest = buf + *rowstride * yy;
-
- for (xx = 0; xx < width; xx++) {
- *dest++ = *src++;
- *dest++ = *src++;
- *dest++ = *src++;
- src++;
- }
- }
-
- return buf;
+
+ if (!start_status)
+ cairo_rectangle (cr,
+ start + dest_x, y + dest_y,
+ x + dest_x, y + dest_y + 1);
+ }
+
+ cairo_fill (cr);
+ cairo_destroy (cr);
}
/**
- * gdk_pixbuf_render_to_drawable:
+ * gdk_pixbuf_render_pixmap_and_mask:
* @pixbuf: A pixbuf.
- * @drawable: Destination drawable.
- * @gc: GC used for rendering.
- * @src_x: Source X coordinate within pixbuf.
- * @src_y: Source Y coordinate within pixbuf.
- * @dest_x: Destination X coordinate within drawable.
- * @dest_y: Destination Y coordinate within drawable.
- * @width: Width of region to render, in pixels.
- * @height: Height of region to render, in pixels.
- * @dither: Dithering mode for GdkRGB.
- * @x_dither: X offset for dither.
- * @y_dither: Y offset for dither.
- *
- * Renders a rectangular portion of a pixbuf to a drawable while using the
- * specified GC. This is done using GdkRGB, so the specified drawable must have
- * the GdkRGB visual and colormap. Note that this function will ignore the
- * opacity information for images with an alpha channel; the GC must already
- * have the clipping mask set if you want transparent regions to show through.
+ * @pixmap_return: Location to store a pointer to the created pixmap,
+ * or %NULL if the pixmap is not needed.
+ * @mask_return: Location to store a pointer to the created mask,
+ * or %NULL if the mask is not needed.
+ * @alpha_threshold: Threshold value for opacity values.
+ *
+ * Creates a pixmap and a mask bitmap which are returned in the @pixmap_return
+ * and @mask_return arguments, respectively, and renders a pixbuf and its
+ * corresponding thresholded alpha mask to them. This is merely a convenience
+ * function; applications that need to render pixbufs with dither offsets or to
+ * given drawables should use Cairo and gdk_pixbuf_render_threshold_alpha().
+ *
+ * The pixmap that is created is created for the colormap returned
+ * by gdk_colormap_get_system(). You normally will want to instead use
+ * the actual colormap for a widget, and use
+ * gdk_pixbuf_render_pixmap_and_mask_for_colormap().
*
- * For an explanation of dither offsets, see the GdkRGB documentation. In
- * brief, the dither offset is important when re-rendering partial regions of an
- * image to a rendered version of the full image, or for when the offsets to a
- * base position change, as in scrolling. The dither matrix has to be shifted
- * for consistent visual results. If you do not have any of these cases, the
- * dither offsets can be both zero.
+ * If the pixbuf does not have an alpha channel, then *@mask_return will be set
+ * to %NULL.
**/
void
-gdk_pixbuf_render_to_drawable (GdkPixbuf *pixbuf,
- GdkDrawable *drawable, GdkGC *gc,
- int src_x, int src_y,
- int dest_x, int dest_y,
- int width, int height,
- GdkRgbDither dither,
- int x_dither, int y_dither)
+gdk_pixbuf_render_pixmap_and_mask (GdkPixbuf *pixbuf,
+ GdkPixmap **pixmap_return,
+ GdkBitmap **mask_return,
+ int alpha_threshold)
{
- ArtPixBuf *apb;
- guchar *buf;
- int rowstride;
-
- g_return_if_fail (pixbuf != NULL);
- apb = pixbuf->art_pixbuf;
-
- g_return_if_fail (apb->format == ART_PIX_RGB);
- g_return_if_fail (apb->n_channels == 3 || apb->n_channels == 4);
- g_return_if_fail (apb->bits_per_sample == 8);
-
- g_return_if_fail (drawable != NULL);
- g_return_if_fail (gc != NULL);
-
- g_return_if_fail (src_x >= 0 && src_x + width <= apb->width);
- g_return_if_fail (src_y >= 0 && src_y + height <= apb->height);
-
- /* This will have to be modified once libart supports other image types.
- * Also, GdkRGB does not have gdk_draw_rgb_32_image_dithalign(), so we
- * have to pack the buffer first.
- */
-
- if (apb->has_alpha)
- buf = remove_alpha (apb, src_x, src_y, width, height, &rowstride);
- else {
- buf = apb->pixels + src_y * apb->rowstride + src_x * 3;
- rowstride = apb->rowstride;
- }
-
- gdk_draw_rgb_image_dithalign (drawable, gc,
- dest_x, dest_y,
- width, height,
- dither,
- buf, rowstride,
- x_dither, y_dither);
-
- if (apb->has_alpha)
- g_free (buf);
+ gdk_pixbuf_render_pixmap_and_mask_for_colormap (pixbuf,
+ gdk_colormap_get_system (),
+ pixmap_return, mask_return,
+ alpha_threshold);
}
-\f
+static void
+remove_alpha_channel (GdkPixbuf *pixbuf)
+{
+ unsigned int x, y, width, height, stride;
+ unsigned char *data;
+
+ if (!gdk_pixbuf_get_has_alpha (pixbuf))
+ return;
+
+ width = gdk_pixbuf_get_width (pixbuf);
+ height = gdk_pixbuf_get_height (pixbuf);
+ stride = gdk_pixbuf_get_rowstride (pixbuf);
+ data = gdk_pixbuf_get_pixels (pixbuf);
+
+ for (y = 0; y < height; y++)
+ {
+ for (x = 0; x < width; x++)
+ {
+ data[x * 4 + 3] = 0xFF;
+ }
+
+ data += stride;
+ }
+}
/**
- * gdk_pixbuf_render_to_drawable_alpha:
+ * gdk_pixbuf_render_pixmap_and_mask_for_colormap:
* @pixbuf: A pixbuf.
- * @drawable: Destination drawable.
- * @src_x: Source X coordinate within pixbuf.
- * @src_y: Source Y coordinates within pixbuf.
- * @dest_x: Destination X coordinate within drawable.
- * @dest_y: Destination Y coordinate within drawable.
- * @width: Width of region to render, in pixels.
- * @height: Height of region to render, in pixels.
- * @alpha_mode: If the image does not have opacity information, this is ignored.
- * Otherwise, specifies how to handle transparency when rendering.
- * @alpha_threshold: If the image does have opacity information and @alpha_mode
- * is GDK_PIXBUF_ALPHA_BILEVEL, specifies the threshold value for opacity
- * values.
- * @dither: Dithering mode for GdkRGB.
- * @x_dither: X offset for dither.
- * @y_dither: Y offset for dither.
+ * @colormap: A #GdkColormap
+ * @pixmap_return: Location to store a pointer to the created pixmap,
+ * or %NULL if the pixmap is not needed.
+ * @mask_return: Location to store a pointer to the created mask,
+ * or %NULL if the mask is not needed.
+ * @alpha_threshold: Threshold value for opacity values.
+ *
+ * Creates a pixmap and a mask bitmap which are returned in the @pixmap_return
+ * and @mask_return arguments, respectively, and renders a pixbuf and its
+ * corresponding tresholded alpha mask to them. This is merely a convenience
+ * function; applications that need to render pixbufs with dither offsets or to
+ * given drawables should use Cairo and gdk_pixbuf_render_threshold_alpha().
*
- * Renders a rectangular portion of a pixbuf to a drawable. This is done using
- * GdkRGB, so the specified drawable must have the GdkRGB visual and colormap.
+ * The pixmap that is created uses the #GdkColormap specified by @colormap.
+ * This colormap must match the colormap of the window where the pixmap
+ * will eventually be used or an error will result.
*
- * When used with #GDK_PIXBUF_ALPHA_BILEVEL, this function has to create a bitmap
- * out of the thresholded alpha channel of the image and, it has to set this
- * bitmap as the clipping mask for the GC used for drawing. This can be a
- * significant performance penalty depending on the size and the complexity of
- * the alpha channel of the image. If performance is crucial, consider handling
- * the alpha channel yourself (possibly by caching it in your application) and
- * using gdk_pixbuf_render_to_drawable() or GdkRGB directly instead.
+ * If the pixbuf does not have an alpha channel, then *@mask_return will be set
+ * to %NULL.
**/
void
-gdk_pixbuf_render_to_drawable_alpha (GdkPixbuf *pixbuf, GdkDrawable *drawable,
- int src_x, int src_y,
- int dest_x, int dest_y,
- int width, int height,
- GdkPixbufAlphaMode alpha_mode,
- int alpha_threshold,
- GdkRgbDither dither,
- int x_dither, int y_dither)
+gdk_pixbuf_render_pixmap_and_mask_for_colormap (GdkPixbuf *pixbuf,
+ GdkColormap *colormap,
+ GdkPixmap **pixmap_return,
+ GdkBitmap **mask_return,
+ int alpha_threshold)
{
- ArtPixBuf *apb;
- GdkBitmap *bitmap = NULL;
- GdkGC *gc;
-
- g_return_if_fail (pixbuf != NULL);
- apb = pixbuf->art_pixbuf;
-
- g_return_if_fail (apb->format == ART_PIX_RGB);
- g_return_if_fail (apb->n_channels == 3 || apb->n_channels == 4);
- g_return_if_fail (apb->bits_per_sample == 8);
-
- g_return_if_fail (drawable != NULL);
- g_return_if_fail (src_x >= 0 && src_x + width <= apb->width);
- g_return_if_fail (src_y >= 0 && src_y + height <= apb->height);
-
- gc = gdk_gc_new (drawable);
-
- if (apb->has_alpha) {
- /* Right now we only support GDK_PIXBUF_ALPHA_BILEVEL, so we
- * unconditionally create the clipping mask.
- */
-
- bitmap = gdk_pixmap_new (NULL, width, height, 1);
- gdk_pixbuf_render_threshold_alpha (pixbuf, bitmap,
- src_x, src_y,
- 0, 0,
- width, height,
- alpha_threshold);
-
- gdk_gc_set_clip_mask (gc, bitmap);
- gdk_gc_set_clip_origin (gc, dest_x, dest_y);
+ GdkScreen *screen;
+
+ g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
+ g_return_if_fail (GDK_IS_COLORMAP (colormap));
+
+ screen = gdk_colormap_get_screen (colormap);
+
+ if (pixmap_return)
+ {
+ GdkPixbuf *tmp_pixbuf;
+ cairo_t *cr;
+
+ *pixmap_return = gdk_pixmap_new (gdk_screen_get_root_window (screen),
+ gdk_pixbuf_get_width (pixbuf), gdk_pixbuf_get_height (pixbuf),
+ gdk_colormap_get_visual (colormap)->depth);
+
+ gdk_drawable_set_colormap (GDK_DRAWABLE (*pixmap_return), colormap);
+
+ /* If the pixbuf has an alpha channel, using gdk_cairo_set_source_pixbuf()
+ * would give
+ * random pixel values in the area that are within the mask, but semi-
+ * transparent. So we treat the pixbuf like a pixbuf without alpha channel;
+ * see bug #487865.
+ */
+ if (gdk_pixbuf_get_has_alpha (pixbuf))
+ {
+ int width, height;
+
+ width = gdk_pixbuf_get_width (pixbuf);
+ height = gdk_pixbuf_get_height (pixbuf);
+ tmp_pixbuf = gdk_pixbuf_copy (pixbuf);
+ remove_alpha_channel (tmp_pixbuf);
+ }
+ else
+ tmp_pixbuf = g_object_ref (pixbuf);
+
+ cr = gdk_cairo_create (*pixmap_return);
+ gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+ cairo_paint (cr);
+
+ cairo_destroy (cr);
+ g_object_unref (tmp_pixbuf);
+ }
+
+ if (mask_return)
+ {
+ if (gdk_pixbuf_get_has_alpha (pixbuf))
+ {
+ *mask_return = gdk_pixmap_new (gdk_screen_get_root_window (screen),
+ gdk_pixbuf_get_width (pixbuf), gdk_pixbuf_get_height (pixbuf), 1);
+
+ gdk_pixbuf_render_threshold_alpha (pixbuf, *mask_return,
+ 0, 0, 0, 0,
+ gdk_pixbuf_get_width (pixbuf), gdk_pixbuf_get_height (pixbuf),
+ alpha_threshold);
}
-
- gdk_pixbuf_render_to_drawable (pixbuf, drawable, gc,
- src_x, src_y,
- dest_x, dest_y,
- width, height,
- dither,
- x_dither, y_dither);
-
- if (bitmap)
- gdk_bitmap_unref (bitmap);
- gdk_gc_unref (gc);
+ else
+ *mask_return = NULL;
+ }
}
-
projects / ~andy / gtk / blobdiff