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add page size limit in reading pdf/djvu files

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pull/2/merge
chrox 12 years ago committed by Qingping Hou
parent 9e8a92862c
commit 7fb6f16552
3 changed files with 65 additions and 59 deletions
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77
k2pdfopt.c
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@ -90,18 +90,10 @@
** Constants from the front of the CRC standard math tables
** (Accuracy = 50 digits)
*/
/* The 50 digits cause problems with MPW's Mr. C on the Macintosh, */
/* so I've truncated to 20 digits. */
/*
#define PI 3.14159265358979323846264338327950288419716939937511
#define SQRT2 1.41421356237309504880168872420969807856967187537695
#define SQRT3 1.73205080756887729352744634150587236694280525381039
#define LOG10E 0.43429448190325182765112891891660508229439700580367
*/
#define PI 3.1415926535897932384
#define SQRT2 1.4142135623730950488
#define SQRT3 1.7320508075688772935
#define LOG10E 0.4342944819032518276
#define PI 3.14159265358979323846264338327950288419716939937511
#define SQRT2 1.41421356237309504880168872420969807856967187537695
#define SQRT3 1.73205080756887729352744634150587236694280525381039
#define LOG10E 0.43429448190325182765112891891660508229439700580367
#define DBPERNEP (20.*LOG10E)
#define SRC_TYPE_PDF 1
@ -414,6 +406,9 @@ static MASTERINFO _masterinfo, *masterinfo;
static int master_bmp_inited = 0;
static int master_bmp_width = 0;
static int master_bmp_height = 0;
static int max_page_width_pix = 3000;
static int max_page_height_pix = 4000;
static double shrink_factor = 0.9;
static void k2pdfopt_reflow_bmp(MASTERINFO *masterinfo, WILLUSBITMAP *src) {
PAGEINFO _pageinfo, *pageinfo;
@ -475,14 +470,62 @@ static void k2pdfopt_reflow_bmp(MASTERINFO *masterinfo, WILLUSBITMAP *src) {
bmp_free(srcgrey);
}
void k2pdfopt_mupdf_reflow(fz_context *ctx, fz_pixmap *pix, double rot_deg) {
void k2pdfopt_mupdf_reflow(fz_document *doc, fz_page *page, fz_context *ctx, \
double dpi, double gamma, double rot_deg) {
fz_device *dev;
fz_pixmap *pix;
fz_rect bounds,bounds2;
fz_matrix ctm;
fz_bbox bbox;
WILLUSBITMAP _src, *src;
double dpp;
do {
dpp = dpi / 72.;
pix = NULL;
fz_var(pix);
bounds = fz_bound_page(doc, page);
ctm = fz_scale(dpp, dpp);
// ctm=fz_concat(ctm,fz_rotate(rotation));
bounds2 = fz_transform_rect(ctm, bounds);
bbox = fz_round_rect(bounds2);
printf("reading page:%d,%d,%d,%d dpi:%.0f\n",bbox.x0,bbox.y0,bbox.x1,bbox.y1,dpi);
dpi = dpi*shrink_factor;
} while (bbox.x1 > max_page_width_pix | bbox.y1 > max_page_height_pix);
// ctm=fz_translate(0,-page->mediabox.y1);
// ctm=fz_concat(ctm,fz_scale(dpp,-dpp));
// ctm=fz_concat(ctm,fz_rotate(page->rotate));
// ctm=fz_concat(ctm,fz_rotate(0));
// bbox=fz_round_rect(fz_transform_rect(ctm,page->mediabox));
// pix=fz_new_pixmap_with_rect(colorspace,bbox);
pix = fz_new_pixmap_with_bbox(ctx, fz_device_gray, bbox);
fz_clear_pixmap_with_value(ctx, pix, 0xff);
dev = fz_new_draw_device(ctx, pix);
#ifdef MUPDF_TRACE
fz_device *tdev;
fz_try(ctx) {
tdev = fz_new_trace_device(ctx);
fz_run_page(doc, page, tdev, ctm, NULL);
}
fz_always(ctx) {
fz_free_device(tdev);
}
#endif
fz_run_page(doc, page, dev, ctm, NULL);
fz_free_device(dev);
if(gamma >= 0.0) {
fz_gamma_pixmap(ctx, pix, gamma);
}
src = &_src;
masterinfo = &_masterinfo;
bmp_init(src);
int status = bmpmupdf_pixmap_to_bmp(src, ctx, pix);
k2pdfopt_reflow_bmp(masterinfo, src);
bmp_free(src);
fz_drop_pixmap(ctx, pix);
}
void k2pdfopt_djvu_reflow(ddjvu_page_t *page, ddjvu_context_t *ctx, \
@ -499,8 +542,12 @@ void k2pdfopt_djvu_reflow(ddjvu_page_t *page, ddjvu_context_t *ctx, \
ih = ddjvu_page_get_height(page);
idpi = ddjvu_page_get_resolution(page);
prect.x = prect.y = 0;
prect.w = iw * dpi / idpi;
prect.h = ih * dpi / idpi;
do {
prect.w = iw * dpi / idpi;
prect.h = ih * dpi / idpi;
printf("reading page:%d,%d,%d,%d dpi:%.0f\n",prect.x,prect.y,prect.w,prect.h,dpi);
dpi = dpi*shrink_factor;
} while (prect.w > max_page_width_pix | prect.h > max_page_height_pix);
rrect = prect;
src = &_src;

3
k2pdfopt.h
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@ -26,7 +26,8 @@
#include <fitz/fitz-internal.h>
#include <libdjvu/ddjvuapi.h>
void k2pdfopt_mupdf_reflow(fz_context *ctx, fz_pixmap *pix, double rot_deg);
void k2pdfopt_mupdf_reflow(fz_document *doc, fz_page *page, fz_context *ctx, \
double dpi, double gamma, double rot_deg);
void k2pdfopt_djvu_reflow(ddjvu_page_t *page, ddjvu_context_t *ctx, \
ddjvu_render_mode_t mode, ddjvu_format_t *fmt, double dpi);
void k2pdfopt_rfbmp_size(int *width, int *height);

44
pdf.c
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@ -512,61 +512,19 @@ static int closePage(lua_State *L) {
}
static int reflowPage(lua_State *L) {
fz_context *ctx;
fz_device *dev;
fz_pixmap *pix;
fz_rect bounds,bounds2;
fz_matrix ctm;
fz_bbox bbox;
PdfPage *page = (PdfPage*) luaL_checkudata(L, 1, "pdfpage");
DrawContext *dc = (DrawContext*) luaL_checkudata(L, 2, "drawcontext");
double dpi = 250*(dc->zoom);
double dpp;
dpp = dpi / 72.;
pix = NULL;
fz_var(pix);
bounds = fz_bound_page(page->doc->xref, page->page);
ctm = fz_scale(dpp, dpp);
// ctm=fz_concat(ctm,fz_rotate(rotation));
bounds2 = fz_transform_rect(ctm, bounds);
bbox = fz_round_rect(bounds2);
// ctm=fz_translate(0,-page->mediabox.y1);
// ctm=fz_concat(ctm,fz_scale(dpp,-dpp));
// ctm=fz_concat(ctm,fz_rotate(page->rotate));
// ctm=fz_concat(ctm,fz_rotate(0));
// bbox=fz_round_rect(fz_transform_rect(ctm,page->mediabox));
// pix=fz_new_pixmap_with_rect(colorspace,bbox);
pix = fz_new_pixmap_with_bbox(page->doc->context, fz_device_gray, bbox);
printf("bbox:%d,%d,%d,%d\n",bbox.x0,bbox.y0,bbox.x1,bbox.y1);
fz_clear_pixmap_with_value(page->doc->context, pix, 0xff);
dev = fz_new_draw_device(page->doc->context, pix);
#ifdef MUPDF_TRACE
fz_device *tdev;
fz_try(page->doc->context) {
tdev = fz_new_trace_device(page->doc->context);
fz_run_page(page->doc->xref, page->page, tdev, ctm, NULL);
}
fz_always(page->doc->context) {
fz_free_device(tdev);
}
#endif
fz_run_page(page->doc->xref, page->page, dev, ctm, NULL);
fz_free_device(dev);
if(dc->gamma >= 0.0) {
fz_gamma_pixmap(page->doc->context, pix, dc->gamma);
}
int width, height;
k2pdfopt_mupdf_reflow(page->doc->context, pix, 0);
k2pdfopt_mupdf_reflow(page->doc->xref, page->page, page->doc->context, dpi, dc->gamma, 0);
k2pdfopt_rfbmp_size(&width, &height);
lua_pushnumber(L, (double)width);
lua_pushnumber(L, (double)height);
fz_drop_pixmap(page->doc->context, pix);
return 2;
}

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