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fix offset calculation in djvu.c

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use 4th and 5th args in renderrect in drawPage method.
This commit is contained in:
Qingping Hou
2012-06-04 13:15:54 +08:00
parent e4160a9909
commit 75ee86b2cb
1 changed files with 14 additions and 10 deletions
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24
djvu.c
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@@ -26,7 +26,6 @@
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
/*@TODO check all the close method, ensure memories are freed 03.03 2012*/
typedef struct DjvuDocument {
ddjvu_context_t *context;
@@ -363,6 +362,16 @@ static int closePage(lua_State *L) {
return 0;
}
/* draw part of the page to bb.
*
* @page: DjvuPage user data
* @dc: DrawContext user data
* @bb: BlitBuffer user data
* @x: x offset within zoomed page
* @y: y offset within zoomed page
*
* width and height for the visible_area is obtained from bb.
*/
static int drawPage(lua_State *L) {
DjvuPage *page = (DjvuPage*) luaL_checkudata(L, 1, "djvupage");
DrawContext *dc = (DrawContext*) luaL_checkudata(L, 2, "drawcontext");
@@ -382,18 +391,12 @@ static int drawPage(lua_State *L) {
ddjvu_format_set_gamma(pixelformat, dc->gamma);
/*ddjvu_format_set_ditherbits(dc->pixelformat, 2);*/
/*printf("@page %d, @@zoom:%f, offset: (%d, %d)\n", page->num, dc->zoom, dc->offset_x, dc->offset_y);*/
/* render full page into rectangle specified by pagerect */
/*pagerect.x = luaL_checkint(L, 4);*/
/*pagerect.y = luaL_checkint(L, 5);*/
pagerect.x = 0;
pagerect.y = 0;
pagerect.w = page->info.width * dc->zoom;
pagerect.h = page->info.height * dc->zoom;
/*printf("--pagerect--- (x: %d, y: %d), w: %d, h: %d.\n", 0, 0, pagerect.w, pagerect.h);*/
/* copy pixels area from pagerect specified by renderrect.
@@ -405,12 +408,13 @@ static int drawPage(lua_State *L) {
* and up. So we need to handle positive offset manually when copying
* imagebuffer to blitbuffer (framebuffer).
*/
renderrect.x = MAX(-dc->offset_x, 0);
renderrect.y = MAX(-dc->offset_y, 0);
renderrect.x = luaL_checkint(L, 4);
renderrect.y = luaL_checkint(L, 5);
/*renderrect.x = MAX(-dc->offset_x, 0);*/
/*renderrect.y = MAX(-dc->offset_y, 0);*/
renderrect.w = MIN(pagerect.w - renderrect.x, bb->w);
renderrect.h = MIN(pagerect.h - renderrect.y, bb->h);
/*printf("--renderrect--- (%d, %d), w:%d, h:%d\n", renderrect.x, renderrect.y, renderrect.w, renderrect.h);*/
/* ddjvulibre library only supports rotation of 0, 90, 180 and 270 degrees.
* This four kinds of rotations can already be achieved by native system.