dst_ptr += bytes_per_row; /* continue with leftmost byte of next row */
}
- mask_pixmap = XCreateBitmapFromData(display, window, (char *)mask_data,
- image->width, image->height);
+ if ((mask_pixmap = XCreateBitmapFromData(display, window, (char *)mask_data,
+ image->width, image->height))
+ == None)
+ Error(ERR_EXIT, "Image_to_Mask(): XCreateBitmapFromData() failed");
+
+ free(mask_data);
+
+ return mask_pixmap;
+}
+
+Pixmap Pixmap_to_Mask(Pixmap src_pixmap, int src_width, int src_height)
+{
+ XImage *src_ximage;
+ byte *src_ptr, *dst_ptr, *dst_ptr2;
+ int bits_per_pixel;
+ int bytes_per_pixel;
+ unsigned int bytes_per_row;
+ unsigned int x, y, i;
+ byte bitmask;
+ byte *mask_data;
+ Pixmap mask_pixmap;
+
+ /* copy source pixmap to temporary image */
+ if ((src_ximage = XGetImage(display, src_pixmap, 0, 0, src_width, src_height,
+ AllPlanes, ZPixmap)) == NULL)
+ Error(ERR_EXIT, "Pixmap_to_Mask(): XGetImage() failed");
+
+ bits_per_pixel = src_ximage->bits_per_pixel;
+ bytes_per_pixel = (bits_per_pixel + 7) / 8;
+
+ bytes_per_row = (src_width + 7) / 8;
+ mask_data = checked_calloc(bytes_per_row * src_height);
+
+ src_ptr = (byte *)src_ximage->data;
+ dst_ptr = mask_data;
+
+ /* create bitmap data which can be used by 'XCreateBitmapFromData()'
+ * directly to create a pixmap of depth 1 for use as a clip mask for
+ * the corresponding image pixmap
+ */
+
+ for (y = 0; y < src_height; y++)
+ {
+ bitmask = 0x01; /* start with leftmost bit in the byte */
+ dst_ptr2 = dst_ptr; /* start with leftmost byte in the row */
+
+ for (x = 0; x < src_width; x++)
+ {
+ for (i = 0; i < bytes_per_pixel; i++)
+ if (*src_ptr++) /* source pixel solid? (pixel index != 0) */
+ *dst_ptr2 |= bitmask; /* then write a bit into the image mask */
+
+ if ((bitmask <<= 1) == 0) /* bit at rightmost byte position reached? */
+ {
+ bitmask = 0x01; /* start again with leftmost bit position */
+ dst_ptr2++; /* continue with next byte in image mask */
+ }
+ }
+
+ dst_ptr += bytes_per_row; /* continue with leftmost byte of next row */
+ }
+
+ if ((mask_pixmap = XCreateBitmapFromData(display, window->drawable,
+ (char *)mask_data,
+ src_width, src_height)) == None)
+ Error(ERR_EXIT, "Pixmap_to_Mask(): XCreateBitmapFromData() failed");
+
free(mask_data);
return mask_pixmap;
-----------------------------------------------------------------------------
ZoomPixmap
- Important note: The scaling code currently only supports scaling down the
- image by a power of 2 -- scaling up is currently not supported at all!
+ Important note: The scaling code currently only supports scaling of the image
+ up or down by a power of 2 -- other scaling factors currently not supported!
+ Also not supported is scaling of pixmap masks (with depth 1); to scale them,
+ better use Pixmap_to_Mask() for now.
-----------------------------------------------------------------------------
*/
byte *src_ptr, *dst_ptr;
int bits_per_pixel;
int bytes_per_pixel;
- int x, y, i;
- int zoom_factor = src_width / dst_width; /* currently very limited! */
+ int x, y, xx, yy, i;
int row_skip, col_skip;
+ int zoom_factor;
+ boolean scale_down = (src_width > dst_width);
- /* adjust source image size to integer multiple of destination image size */
- src_width = dst_width * zoom_factor;
- src_height = dst_height * zoom_factor;
+ if (scale_down)
+ {
+ zoom_factor = src_width / dst_width;
+
+ /* adjust source image size to integer multiple of destination size */
+ src_width = dst_width * zoom_factor;
+ src_height = dst_height * zoom_factor;
+ }
+ else
+ {
+ zoom_factor = dst_width / src_width;
+
+ /* no adjustment needed when scaling up (some pixels may be left blank) */
+ }
/* copy source pixmap to temporary image */
- src_ximage = XGetImage(display, src_pixmap, 0, 0, src_width, src_height,
- AllPlanes, ZPixmap);
+ if ((src_ximage = XGetImage(display, src_pixmap, 0, 0, src_width, src_height,
+ AllPlanes, ZPixmap)) == NULL)
+ Error(ERR_EXIT, "ZoomPixmap(): XGetImage() failed");
bits_per_pixel = src_ximage->bits_per_pixel;
bytes_per_pixel = (bits_per_pixel + 7) / 8;
- dst_ximage = XCreateImage(display, visual, src_ximage->depth, ZPixmap,
- 0, NULL, dst_width, dst_height,
- 8, dst_width * bytes_per_pixel);
+ if ((dst_ximage = XCreateImage(display, visual, src_ximage->depth, ZPixmap,
+ 0, NULL, dst_width, dst_height,
+ 8, dst_width * bytes_per_pixel)) == NULL)
+ Error(ERR_EXIT, "ZoomPixmap(): XCreateImage() failed");
+
dst_ximage->data =
checked_malloc(dst_width * dst_height * bytes_per_pixel);
dst_ximage->byte_order = src_ximage->byte_order;
src_ptr = (byte *)src_ximage->data;
dst_ptr = (byte *)dst_ximage->data;
- col_skip = (zoom_factor - 1) * bytes_per_pixel;
- row_skip = col_skip * src_width;
+ if (scale_down)
+ {
+ col_skip = (zoom_factor - 1) * bytes_per_pixel;
+ row_skip = col_skip * src_width;
+
+ /* scale image down by scaling factor 'zoom_factor' */
+ for (y = 0; y < src_height; y += zoom_factor, src_ptr += row_skip)
+ for (x = 0; x < src_width; x += zoom_factor, src_ptr += col_skip)
+ for (i = 0; i < bytes_per_pixel; i++)
+ *dst_ptr++ = *src_ptr++;
+ }
+ else
+ {
+ row_skip = src_width * bytes_per_pixel;
- /* scale image down by scaling factor 'zoom_factor' */
- for (y = 0; y < src_height; y += zoom_factor, src_ptr += row_skip)
- for (x = 0; x < src_width; x += zoom_factor, src_ptr += col_skip)
- for (i = 0; i < bytes_per_pixel; i++)
- *dst_ptr++ = *src_ptr++;
+ /* scale image up by scaling factor 'zoom_factor' */
+ for (y = 0; y < src_height; y++)
+ {
+ for (yy = 0; yy < zoom_factor; yy++)
+ {
+ if (yy > 0)
+ src_ptr -= row_skip;
+
+ for (x = 0; x < src_width; x++)
+ {
+ for (xx = 0; xx < zoom_factor; xx++)
+ for (i = 0; i < bytes_per_pixel; i++)
+ *dst_ptr++ = *(src_ptr + i);
+
+ src_ptr += i;
+ }
+ }
+ }
+ }
/* copy scaled image to destination pixmap */
XPutImage(display, dst_pixmap, gc, dst_ximage, 0, 0, 0, 0,
projects / rocksndiamonds.git / blobdiff