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142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
/*
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* Creates an GdkPixbuf from a Drawable
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*
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* Author:
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* Cody Russell <bratsche@dfw.net>
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*/
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#include <config.h>
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <gmodule.h>
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#include "gdk-pixbuf.h"
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#include "gdk-pixbuf-drawable.h"
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/* private function */
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static GdkPixbuf *
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gdk_pixbuf_from_drawable_core (GdkWindow *window, gint x, gint y, gint width, gint height,
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gint with_alpha)
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{
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GdkImage *image;
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ArtPixBuf *art_pixbuf;
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GdkColormap *colormap;
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art_u8 *buff;
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art_u8 *pixels;
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gulong pixel;
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gint rowstride;
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art_u8 r, g, b;
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gint xx, yy;
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gint fatness;
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gint screen_width, screen_height;
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gint window_width, window_height, window_x, window_y;
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g_return_val_if_fail (window != NULL, NULL);
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screen_width = gdk_screen_width();
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screen_height = gdk_screen_height();
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gdk_window_get_geometry(window, NULL, NULL,
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&window_width, &window_height, NULL);
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gdk_window_get_origin(window, &window_x, &window_y);
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/* If part of the requested image is offscreen, return NULL. */
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if((window_x) < 0 || (window_y < 0) ||
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(window_x + window_width > screen_width) ||
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(window_y + window_height > screen_height))
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{
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return NULL;
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}
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image = gdk_image_get (window, x, y, width, height);
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colormap = gdk_rgb_get_cmap ();
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fatness = with_alpha ? 4 : 3;
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rowstride = width * fatness;
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buff = art_alloc (rowstride * height);
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pixels = buff;
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switch (image->depth) {
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case 0:
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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case 8:
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for (yy = 0; yy < height; yy++) {
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for (xx = 0; xx < width; xx++) {
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pixel = gdk_image_get_pixel (image, xx, yy);
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pixels[0] = colormap->colors[pixel].red;
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pixels[1] = colormap->colors[pixel].green;
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pixels[2] = colormap->colors[pixel].blue;
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if (with_alpha)
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pixels[3] = 0;
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pixels += fatness;
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}
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}
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break;
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case 16:
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case 15:
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for (yy = 0; yy < height; yy++) {
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for (xx = 0; xx < width; xx++) {
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pixel = gdk_image_get_pixel (image, xx, yy);
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r = (pixel >> 8) & 0xf8;
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g = (pixel >> 3) & 0xfc;
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b = (pixel << 3) & 0xf8;
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pixels[0] = r;
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pixels[1] = g;
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pixels[2] = b;
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if (with_alpha)
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pixels[3] = 0; /* GdkImages don't have alpha =) */
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pixels += fatness;
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}
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}
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break;
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case 24:
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case 32:
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for (yy = 0; yy < height; yy++) {
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for (xx = 0; xx < width; xx++) {
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pixel = gdk_image_get_pixel (image, xx, yy);
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r = (pixel >> 16) & 0xff;
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g = (pixel >> 8) & 0xff;
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b = pixel & 0xff;
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pixels[0] = r;
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pixels[1] = g;
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pixels[2] = b;
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if (with_alpha)
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pixels[3] = 0; /* GdkImages don't have alpha.. */
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pixels += fatness;
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}
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}
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break;
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default:
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g_error ("art_pixbuf_from_drawable_core (): Unknown depth.");
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}
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art_pixbuf = with_alpha ? art_pixbuf_new_rgba (buff, width, height, rowstride) :
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art_pixbuf_new_rgb (buff, width, height, rowstride);
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return gdk_pixbuf_new_from_art_pixbuf(art_pixbuf);
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}
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/* Public functions */
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GdkPixbuf *
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gdk_pixbuf_rgb_from_drawable (GdkWindow *window, gint x, gint y, gint width, gint height)
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{
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return gdk_pixbuf_from_drawable_core (window, x, y, width, height, 0);
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}
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GdkPixbuf *
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gdk_pixbuf_rgba_from_drawable (GdkWindow *window, gint x, gint y, gint width, gint height)
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{
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return gdk_pixbuf_from_drawable_core (window, x, y, width, height, 1);
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}
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