+/* If fast_draw_8, fast_draw_16 or fast_draw_32 are to be used, the following properties
+ * of the src and dest XImages must hold (otherwise the generic, slooow, method provided
+ * by X is to be used):
+ * src->byte_order == dest->byte_order
+ * src->format == ZPixmap && dest->format == ZPixmap
+ * src->depth == dest->depth == the depth the function in question asumes
+ * x and y is the coordinates in src from where to cut out the image from,
+ * distort_matrix is a precalculated array of how to distort the matrix
+ */
+
+static void fast_draw_8(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
+{
+ CARD8 *u = (CARD8 *)dest->data;
+ CARD8 *t = (CARD8 *)src->data + x + y*src->bytes_per_line/sizeof(CARD8);
+
+ while (u < (CARD8 *)(dest->data + sizeof(CARD8)*dest->height
+ *dest->bytes_per_line/sizeof(CARD8))) {
+ *u++ = t[*distort_matrix++];
+ }
+}
+
+static void fast_draw_16(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
+{
+ CARD16 *u = (CARD16 *)dest->data;
+ CARD16 *t = (CARD16 *)src->data + x + y*src->bytes_per_line/sizeof(CARD16);
+
+ while (u < (CARD16 *)(dest->data + sizeof(CARD16)*dest->height
+ *dest->bytes_per_line/sizeof(CARD16))) {
+ *u++ = t[*distort_matrix++];
+ }
+}
+
+static void fast_draw_32(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
+{
+ CARD32 *u = (CARD32 *)dest->data;
+ CARD32 *t = (CARD32 *)src->data + x + y*src->bytes_per_line/sizeof(CARD32);
+
+ while (u < (CARD32 *)(dest->data + sizeof(CARD32)*dest->height
+ *dest->bytes_per_line/sizeof(CARD32))) {
+ *u++ = t[*distort_matrix++];
+ }
+}
+
+static void generic_draw(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
+{
+ int i, j;
+ for (i = 0; i < dest->width; i++)
+ for (j = 0; j < dest->height; j++)
+ if (st->from[i][j][0] + x >= 0 &&
+ st->from[i][j][0] + x < src->width &&
+ st->from[i][j][1] + y >= 0 &&
+ st->from[i][j][1] + y < src->height)
+ XPutPixel(dest, i, j,
+ XGetPixel(src,
+ st->from[i][j][0] + x,
+ st->from[i][j][1] + y));
+}