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#include "mupdf/fitz.h"
#include <string.h>
#define DPI 72.0f
typedef struct img_document_s img_document;
typedef struct img_page_s img_page;
struct img_page_s
{
fz_page super;
fz_image *image;
};
struct img_document_s
{
fz_document super;
fz_buffer *buffer;
const char *format;
int page_count;
fz_pixmap *(*load_subimage)(fz_context *ctx, const unsigned char *p, size_t total, int subimage);
};
static void
img_drop_document(fz_context *ctx, fz_document *doc_)
{
img_document *doc = (img_document*)doc_;
fz_drop_buffer(ctx, doc->buffer);
}
static int
img_count_pages(fz_context *ctx, fz_document *doc_)
{
img_document *doc = (img_document*)doc_;
return doc->page_count;
}
static fz_rect
img_bound_page(fz_context *ctx, fz_page *page_)
{
img_page *page = (img_page*)page_;
fz_image *image = page->image;
int xres, yres;
fz_rect bbox;
fz_image_resolution(image, &xres, &yres);
bbox.x0 = bbox.y0 = 0;
bbox.x1 = image->w * DPI / xres;
bbox.y1 = image->h * DPI / yres;
return bbox;
}
static void
img_run_page(fz_context *ctx, fz_page *page_, fz_device *dev, fz_matrix ctm, fz_cookie *cookie)
{
img_page *page = (img_page*)page_;
fz_image *image = page->image;
int xres, yres;
float w, h;
fz_image_resolution(image, &xres, &yres);
w = image->w * DPI / xres;
h = image->h * DPI / yres;
ctm = fz_pre_scale(ctm, w, h);
fz_fill_image(ctx, dev, image, ctm, 1, NULL);
}
static void
img_drop_page(fz_context *ctx, fz_page *page_)
{
img_page *page = (img_page*)page_;
fz_drop_image(ctx, page->image);
}
static fz_page *
img_load_page(fz_context *ctx, fz_document *doc_, int number)
{
img_document *doc = (img_document*)doc_;
fz_pixmap *pixmap = NULL;
fz_image *image = NULL;
img_page *page = NULL;
if (number < 0 || number >= doc->page_count)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot load page %d", number);
fz_var(pixmap);
fz_var(image);
fz_var(page);
fz_try(ctx)
{
if (doc->load_subimage)
{
size_t len;
unsigned char *data;
len = fz_buffer_storage(ctx, doc->buffer, &data);
pixmap = doc->load_subimage(ctx, data, len, number);
image = fz_new_image_from_pixmap(ctx, pixmap, NULL);
}
else
{
image = fz_new_image_from_buffer(ctx, doc->buffer);
}
page = fz_new_derived_page(ctx, img_page);
page->super.bound_page = img_bound_page;
page->super.run_page_contents = img_run_page;
page->super.drop_page = img_drop_page;
page->image = fz_keep_image(ctx, image);
}
fz_always(ctx)
{
fz_drop_image(ctx, image);
fz_drop_pixmap(ctx, pixmap);
}
fz_catch(ctx)
{
fz_free(ctx, page);
fz_rethrow(ctx);
}
return (fz_page*)page;
}
static int
img_lookup_metadata(fz_context *ctx, fz_document *doc_, const char *key, char *buf, int size)
{
img_document *doc = (img_document*)doc_;
if (!strcmp(key, "format"))
return (int)fz_strlcpy(buf, doc->format, size);
return -1;
}
static fz_document *
img_open_document_with_stream(fz_context *ctx, fz_stream *file)
{
img_document *doc = NULL;
doc = fz_new_derived_document(ctx, img_document);
doc->super.drop_document = img_drop_document;
doc->super.count_pages = img_count_pages;
doc->super.load_page = img_load_page;
doc->super.lookup_metadata = img_lookup_metadata;
fz_try(ctx)
{
int fmt;
size_t len;
unsigned char *data;
doc->buffer = fz_read_all(ctx, file, 0);
len = fz_buffer_storage(ctx, doc->buffer, &data);
fmt = FZ_IMAGE_UNKNOWN;
if (len >= 8)
fmt = fz_recognize_image_format(ctx, data);
if (fmt == FZ_IMAGE_TIFF)
{
doc->page_count = fz_load_tiff_subimage_count(ctx, data, len);
doc->load_subimage = fz_load_tiff_subimage;
doc->format = "TIFF";
}
else if (fmt == FZ_IMAGE_PNM)
{
doc->page_count = fz_load_pnm_subimage_count(ctx, data, len);
doc->load_subimage = fz_load_pnm_subimage;
doc->format = "PNM";
}
else
{
doc->page_count = 1;
doc->format = "Image";
}
}
fz_catch(ctx)
{
fz_drop_document(ctx, (fz_document*)doc);
fz_rethrow(ctx);
}
return (fz_document*)doc;
}
static const char *img_extensions[] =
{
"bmp",
"gif",
"hdp",
"j2k",
"jfif",
"jfif-tbnl",
"jp2",
"jpe",
"jpeg",
"jpg",
"jpx",
"jxr",
"pam",
"pbm",
"pgm",
"png",
"pnm",
"ppm",
"tif",
"tiff",
"wdp",
NULL
};
static const char *img_mimetypes[] =
{
"image/bmp",
"image/gif",
"image/jp2",
"image/jpeg",
"image/jpx",
"image/jxr",
"image/pjpeg",
"image/png",
"image/tiff",
"image/vnd.ms-photo",
"image/x-portable-anymap",
"image/x-portable-arbitrarymap",
"image/x-portable-bitmap",
"image/x-portable-greymap",
"image/x-portable-pixmap",
"image/x-tiff",
NULL
};
fz_document_handler img_document_handler =
{
NULL,
NULL,
img_open_document_with_stream,
img_extensions,
img_mimetypes
};
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