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#include "mupdf/img.h"
#include <ctype.h> /* for tolower */
#define DPI 72.0f
static void image_init_document(image_document *doc);
struct image_document_s
{
fz_document super;
fz_context *ctx;
fz_stream *file;
fz_image *image;
};
image_document *
image_open_document_with_stream(fz_context *ctx, fz_stream *file)
{
image_document *doc;
fz_buffer *buffer = NULL;
doc = fz_malloc_struct(ctx, image_document);
image_init_document(doc);
doc->ctx = ctx;
doc->file = fz_keep_stream(file);
fz_var(buffer);
fz_try(ctx)
{
buffer = fz_read_all(doc->file, 1024);
doc->image = fz_new_image_from_buffer(ctx, buffer);
}
fz_always(ctx)
{
fz_drop_buffer(ctx, buffer);
}
fz_catch(ctx)
{
image_close_document(doc);
fz_rethrow(ctx);
}
return doc;
}
image_document *
image_open_document(fz_context *ctx, const char *filename)
{
fz_stream *file;
image_document *doc;
file = fz_open_file(ctx, filename);
if (!file)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file '%s': %s", filename, strerror(errno));
fz_try(ctx)
{
doc = image_open_document_with_stream(ctx, file);
}
fz_always(ctx)
{
fz_close(file);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
return doc;
}
void
image_close_document(image_document *doc)
{
fz_context *ctx = doc->ctx;
fz_drop_image(ctx, doc->image);
fz_close(doc->file);
fz_free(ctx, doc);
}
int
image_count_pages(image_document *doc)
{
return 1;
}
image_page *
image_load_page(image_document *doc, int number)
{
if (number != 0)
return NULL;
return (image_page *)doc->image;
}
void
image_free_page(image_document *doc, image_page *page)
{
}
fz_rect *
image_bound_page(image_document *doc, image_page *page, fz_rect *bbox)
{
fz_image *image = (fz_image *)page;
int xres, yres;
fz_image_get_sanitised_res(image, &xres, &yres);
bbox->x0 = bbox->y0 = 0;
bbox->x1 = image->w * DPI / xres;
bbox->y1 = image->h * DPI / yres;
return bbox;
}
void
image_run_page(image_document *doc, image_page *page, fz_device *dev, const fz_matrix *ctm, fz_cookie *cookie)
{
fz_matrix local_ctm = *ctm;
fz_image *image = (fz_image *)page;
int xres, yres;
float w, h;
fz_image_get_sanitised_res(image, &xres, &yres);
w = image->w * DPI / xres;
h = image->h * DPI / yres;
fz_pre_scale(&local_ctm, w, h);
fz_fill_image(dev, image, &local_ctm, 1);
}
static int
image_meta(image_document *doc, int key, void *ptr, int size)
{
switch(key)
{
case FZ_META_FORMAT_INFO:
sprintf((char *)ptr, "IMAGE");
return FZ_META_OK;
default:
return FZ_META_UNKNOWN_KEY;
}
}
static void
image_rebind(image_document *doc, fz_context *ctx)
{
doc->ctx = ctx;
fz_rebind_stream(doc->file, ctx);
}
static void
image_init_document(image_document *doc)
{
doc->super.close = (fz_document_close_fn *)image_close_document;
doc->super.count_pages = (fz_document_count_pages_fn *)image_count_pages;
doc->super.load_page = (fz_document_load_page_fn *)image_load_page;
doc->super.bound_page = (fz_document_bound_page_fn *)image_bound_page;
doc->super.run_page_contents = (fz_document_run_page_contents_fn *)image_run_page;
doc->super.free_page = (fz_document_free_page_fn *)image_free_page;
doc->super.meta = (fz_document_meta_fn *)image_meta;
doc->super.rebind = (fz_document_rebind_fn *)image_rebind;
}
static int
image_recognize(fz_context *doc, const char *magic)
{
char *ext = strrchr(magic, '.');
if (ext)
{
if (!fz_strcasecmp(ext, ".png") || !fz_strcasecmp(ext, ".jpg") ||
!fz_strcasecmp(ext, ".jpeg") || !fz_strcasecmp(ext, ".jfif") ||
!fz_strcasecmp(ext, ".jfif-tbnl") || !fz_strcasecmp(ext, ".jpe"))
return 100;
}
if (!strcmp(magic, "png") || !strcmp(magic, "image/png") ||
!strcmp(magic, "jpg") || !strcmp(magic, "image/jpeg") ||
!strcmp(magic, "jpeg") || !strcmp(magic, "image/pjpeg") ||
!strcmp(magic, "jpe") || !strcmp(magic, "jfif"))
return 100;
return 0;
}
fz_document_handler img_document_handler =
{
(fz_document_recognize_fn *)&image_recognize,
(fz_document_open_fn *)&image_open_document,
(fz_document_open_with_stream_fn *)&image_open_document_with_stream
};
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