void
create_subtexture_and_sync_to_gl(image_bounds * img_bounds, texture_info * tex)
{
/* image vars */
int xbound, ybound;
float * sub = NULL;
/* make the current action's boundaries sane; left until this point because we only
know height/width here */
constrain_boundaries(&img_bounds->xmin, &img_bounds->ymin, &img_bounds->xmax, &img_bounds->ymax,
tex->width, tex->height);
/* helper variables */
ybound = img_bounds->ymax - img_bounds->ymin + 1;
xbound = img_bounds->xmax - img_bounds->xmin + 1;
sub = get_image_chunk(tex, img_bounds->xmin, img_bounds->ymin, img_bounds->xmax, img_bounds->ymax);
sync_to_gl(tex->tname, tex->x_offset + img_bounds->xmin, tex->y_offset + img_bounds->ymin, xbound,
ybound, (void*)sub);
free(sub);
}
/** splice algorithm **/
void
splice_do_action(int x0, int y0, int cx1, int cy1, int cx2, int cy2, texture_info * splice_tex,
texture_info * tex, VALUE hash_arg, texplay_sync sync_mode,
bool primary, action_struct * payload)
{
action_struct cur;
int xbound;
int ybound;
rgba chromakey;
float * image_buf = NULL;
bool inverse_chroma = false;
bool same_image = false;
bool has_chroma = false;
constrain_boundaries(&cx1, &cy1, &cx2, &cy2, splice_tex->width, splice_tex->height);
xbound = cx2 - cx1 + 1;
ybound = cy2 - cy1 + 1;
draw_prologue(&cur, tex, x0, y0,
x0 + xbound, y0 + ybound, &hash_arg, sync_mode, primary, &payload);
if(has_optional_hash_arg(hash_arg, "chroma_key")) {
VALUE c = get_from_hash(hash_arg, "chroma_key");
chromakey = convert_rb_color_to_rgba(c);
has_chroma = true;
}
else if(has_optional_hash_arg(hash_arg, "chroma_key_not")) {
chromakey = convert_rb_color_to_rgba(get_from_hash(hash_arg, "chroma_key_not"));
inverse_chroma = true;
has_chroma = true;
}
if(splice_tex->image == tex->image)
same_image = true;
/* NB: we do not use this in the general case since it's almost 1.5 times as slow.
It is necessary for splicing from/to the same region of pixels though.
*/
if(same_image)
image_buf = get_image_chunk(splice_tex, cx1, cy1, cx2, cy2);
for(int y = 0; y < ybound; y++)
for(int x = 0; x < xbound; x++) {
if(!same_image)
payload->color = get_pixel_color(splice_tex, cx1 + x, cy1 + y);
else
payload->color = get_pixel_color_from_chunk(image_buf, xbound, ybound, x, y);
if(has_chroma) {
bool chroma_match = cmp_color(payload->color, chromakey);
/* look at released 0.2.0 code to see how USED to do this.
this is now a simplified boolean expression (XOR) */
if(chroma_match == inverse_chroma)
set_pixel_color_with_style(payload, tex, x0 + x, y0 + y);
}
else
set_pixel_color_with_style(payload, tex, x0 + x, y0 + y);
}
if(same_image)
free(image_buf);
draw_epilogue(&cur, tex, primary);
}
