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#include "mupdf/fitz.h"
typedef struct tiff_document_s tiff_document;
typedef struct tiff_page_s tiff_page;
#define DPI 72.0f
struct tiff_page_s
{
fz_page super;
fz_image *image;
};
struct tiff_document_s
{
fz_document super;
fz_buffer *buffer;
int page_count;
};
static fz_rect *
tiff_bound_page(fz_context *ctx, tiff_page *page, fz_rect *bbox)
{
fz_image *image = page->image;
int xres, yres;
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
tiff_run_page(fz_context *ctx, tiff_page *page, fz_device *dev, const fz_matrix *ctm, fz_cookie *cookie)
{
fz_matrix local_ctm = *ctm;
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;
fz_pre_scale(&local_ctm, w, h);
fz_fill_image(ctx, dev, image, &local_ctm, 1);
}
static void
tiff_drop_page(fz_context *ctx, tiff_page *page)
{
fz_drop_image(ctx, page->image);
}
static tiff_page *
tiff_load_page(fz_context *ctx, tiff_document *doc, int number)
{
fz_pixmap *pixmap = NULL;
fz_image *image = NULL;
tiff_page *page = NULL;
if (number < 0 || number >= doc->page_count)
return NULL;
fz_var(pixmap);
fz_var(image);
fz_var(page);
fz_try(ctx)
{
size_t len;
unsigned char *data;
len = fz_buffer_storage(ctx, doc->buffer, &data);
pixmap = fz_load_tiff_subimage(ctx, data, len, number);
image = fz_new_image_from_pixmap(ctx, pixmap, NULL);
page = fz_new_page(ctx, sizeof *page);
page->super.bound_page = (fz_page_bound_page_fn *)tiff_bound_page;
page->super.run_page_contents = (fz_page_run_page_contents_fn *)tiff_run_page;
page->super.drop_page = (fz_page_drop_page_fn *)tiff_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 page;
}
static int
tiff_count_pages(fz_context *ctx, tiff_document *doc)
{
return doc->page_count;
}
static int
tiff_lookup_metadata(fz_context *ctx, tiff_document *doc, const char *key, char *buf, int size)
{
if (!strcmp(key, "format"))
return (int)fz_strlcpy(buf, "TIFF", size);
return -1;
}
static void
tiff_drop_document(fz_context *ctx, tiff_document *doc)
{
fz_drop_buffer(ctx, doc->buffer);
}
static tiff_document *
tiff_open_document_with_stream(fz_context *ctx, fz_stream *file)
{
tiff_document *doc;
doc = fz_new_document(ctx, tiff_document);
doc->super.drop_document = (fz_document_drop_fn *)tiff_drop_document;
doc->super.count_pages = (fz_document_count_pages_fn *)tiff_count_pages;
doc->super.load_page = (fz_document_load_page_fn *)tiff_load_page;
doc->super.lookup_metadata = (fz_document_lookup_metadata_fn *)tiff_lookup_metadata;
fz_try(ctx)
{
size_t len;
unsigned char *data;
doc->buffer = fz_read_all(ctx, file, 1024);
len = fz_buffer_storage(ctx, doc->buffer, &data);
doc->page_count = fz_load_tiff_subimage_count(ctx, data, len);
}
fz_catch(ctx)
{
fz_drop_document(ctx, &doc->super);
fz_rethrow(ctx);
}
return doc;
}
static int
tiff_recognize(fz_context *doc, const char *magic)
{
char *ext = strrchr(magic, '.');
if (ext)
{
if (!fz_strcasecmp(ext, ".tiff") || !fz_strcasecmp(ext, ".tif"))
return 100;
}
if (!strcmp(magic, "tif") || !strcmp(magic, "image/tiff") ||
!strcmp(magic, "tiff") || !strcmp(magic, "image/x-tiff"))
return 100;
return 0;
}
fz_document_handler tiff_document_handler =
{
(fz_document_recognize_fn *)&tiff_recognize,
(fz_document_open_fn *)NULL,
(fz_document_open_with_stream_fn *)&tiff_open_document_with_stream
};
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