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Optimize DjVu drawPage() function

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We only need to fill the image buffer with white colour if DjVu page
rendering function did not fill it in with page data.
This commit is contained in:
Tigran Aivazian
2012-10-09 10:23:29 +01:00
committed by Qingping Hou
parent 8ccbfba6cc
commit 0d740d2b3b
1 changed files with 4 additions and 11 deletions
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15
djvu.c
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@@ -476,13 +476,11 @@ static int drawPage(lua_State *L) {
unsigned char adjusted_low[16], adjusted_high[16];
int i, adjust_pixels = 0;
ddjvu_rect_t pagerect, renderrect;
uint8_t *imagebuffer = malloc((bb->w)*(bb->h)+1);
int bbsize = (bb->w)*(bb->h)+1;
uint8_t *imagebuffer = malloc(bbsize);
/*printf("@page %d, @@zoom:%f, offset: (%d, %d)\n", page->num, dc->zoom, dc->offset_x, dc->offset_y);*/
/* fill pixel map with white color */
memset(imagebuffer, 0xFF, (bb->w)*(bb->h)+1);
/* render full page into rectangle specified by pagerect */
pagerect.x = 0;
pagerect.y = 0;
@@ -513,13 +511,8 @@ static int drawPage(lua_State *L) {
* So we don't set rotation here.
*/
ddjvu_page_render(page->page_ref,
djvu_render_mode,
&pagerect,
&renderrect,
page->doc->pixelformat,
bb->w,
imagebuffer);
if (!ddjvu_page_render(page->page_ref, djvu_render_mode, &pagerect, &renderrect, page->doc->pixelformat, bb->w, imagebuffer))
memset(imagebuffer, 0xFF, bbsize);
uint8_t *bbptr = bb->data;
uint8_t *pmptr = imagebuffer;