MDJVU_IMPLEMENT void mdjvu_bitmap_assign(mdjvu_bitmap_t dst, mdjvu_bitmap_t b)
{
mdjvu_destroy_2d_array(((Bitmap *)dst)->data);
((Bitmap *)dst)->data =
mdjvu_create_2d_array(BYTES_PER_ROW(BMP->width), BMP->height);
((Bitmap *)dst)->width = BMP->width;
((Bitmap *)dst)->height = BMP->height;
memcpy(((Bitmap *) dst)->data[0], BMP->data[0], ROW_SIZE * BMP->height);
}
MDJVU_IMPLEMENT void mdjvu_bitmap_destroy(mdjvu_bitmap_t bmp)
{
Bitmap *b = (Bitmap *) bmp;
#ifndef NDEBUG
alive_bitmap_counter--;
#endif
mdjvu_destroy_2d_array(b->data);
free(b);
}
mdjvu_pattern_t mdjvu_pattern_create(mdjvu_bitmap_t bitmap)
{
int32 w = mdjvu_bitmap_get_width(bitmap);
int32 h = mdjvu_bitmap_get_height(bitmap);
mdjvu_pattern_t pattern;
byte **pixels = mdjvu_create_2d_array(w, h);
mdjvu_bitmap_unpack_all(bitmap, pixels);
pattern = mdjvu_pattern_create_from_array(pixels, w, h);
mdjvu_destroy_2d_array(pixels);
return pattern;
}
static void add_to_image(mdjvu_image_t image,
mdjvu_bitmap_t bitmap,
int32 dpi,
mdjvu_split_options_t opt,
int32 blit_shift_x,
int32 blit_shift_y,
int big)
{
int32 max_shape_size = opt ? * (int32 *) opt : 0;
int32 width = mdjvu_bitmap_get_width(bitmap);
int32 height = mdjvu_bitmap_get_height(bitmap);
unsigned char **buf, **window_base, **window_buf, **map;
int32 window_shift = 0, y = 0, i;
if (!max_shape_size)
max_shape_size = dpi;
if (max_shape_size > height)
max_shape_size = height;
/* n-th line will be unpacked into buf[n % max_shape_size] + 1.
* ( +1 is to make the left margin)
* buf[max_shape_size] will always be blank.
*
* window_base[window_shift - 1]
* points to buf[max_shape_size] + 1 (blank line) - top margin
* window_base[window_shift + max_shape_size]
* points to buf[max_shape_size] + 1 (blank line) - bottom margin
* window_base[window_shift + i]
* points to buf[(window_shift + i) % max_shape_size] + 1.
*/
/* map has the right margin of 1 */
map = mdjvu_create_2d_array(width + 1, max_shape_size);
/* buf has left, right and bottom margins of 1 */
buf = mdjvu_create_2d_array(width + 2, max_shape_size + 1);
window_buf = (unsigned char **)
malloc(2 * (max_shape_size + 2) * sizeof(unsigned char *));
window_base = window_buf + 1;
/* Unpack initial portion of the bitmap; bind the window to the buffer */
for (i = 0; i < max_shape_size; i++)
{
window_base[i] = window_base[max_shape_size + i] = buf[i] + 1;
mdjvu_bitmap_unpack_row(bitmap, buf[i] + 1, i);
}
/* Setup top and bottom white margins */
window_base[-1] =
window_base[2 * max_shape_size - 1] =
buf[max_shape_size] + 1;
/* The "window moving" loop.
* We're moving a (width x max_shape_size) window through the image.
*/
while(1)
{
/* Extract some shapes from the window
* (shapes touching the topmost row will be affected).
*/
unsigned char *top_margin_save = /* make the top margin */
window_base[window_shift - 1]; /* (save what was there) */
unsigned char *bot_margin_save = /* same with the bottom margin */
window_base[window_shift + max_shape_size];
int32 old_window_shift;
window_base[window_shift - 1] = buf[max_shape_size] + 1; /* clear them */
window_base[window_shift + max_shape_size] = buf[max_shape_size] + 1;
process_row(window_base + window_shift, map,
/* index of a row to process: */ 0,
width, max_shape_size, image, 0, y, max_shape_size,
blit_shift_x, blit_shift_y, dpi, opt, big);
window_base[window_shift - 1] = top_margin_save; /* restore margins */
window_base[window_shift + max_shape_size] = bot_margin_save;
/* Shift the window */
y++;
old_window_shift = window_shift;
window_shift = y % max_shape_size;
if (y + max_shape_size > height)
break;
/* Unpack a new row into the bottom window row */
mdjvu_bitmap_unpack_row(bitmap, buf[old_window_shift] + 1,
y + max_shape_size - 1);
}
/* Process the last window fully */
for (i = 0; y + i < height; i++)
{
process_row(window_base + window_shift, map,
/* index of a row to process: */ i,
width, max_shape_size, image, 0, y, max_shape_size,
blit_shift_x, blit_shift_y, dpi, opt, big);
}
/* Clean up */
free(window_buf);
mdjvu_destroy_2d_array(map);
mdjvu_destroy_2d_array(buf);
}