tiff-document.c File Reference

#include "config.h"
#include <stdio.h>
#include <glib.h>
#include <glib/gi18n-lib.h>
#include "tiffio.h"
#include "tiff2ps.h"
#include "tiff-document.h"
#include "ev-document-misc.h"
#include "ev-file-exporter.h"
#include "ev-file-helpers.h"

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Data Structures
struct	_TiffDocumentClass
struct	_TiffDocument

Typedefs
typedef struct _TiffDocumentClass	TiffDocumentClass

Functions
static void	tiff_document_document_file_exporter_iface_init (EvFileExporterInterface *iface)
	EV_BACKEND_REGISTER_WITH_CODE (TiffDocument, tiff_document,{EV_BACKEND_IMPLEMENT_INTERFACE(EV_TYPE_FILE_EXPORTER, tiff_document_document_file_exporter_iface_init);})
static void	push_handlers (void)
static void	pop_handlers (void)
static gboolean	tiff_document_load (EvDocument *document, const char *uri, GError **error)
static gboolean	tiff_document_save (EvDocument *document, const char *uri, GError **error)
static int	tiff_document_get_n_pages (EvDocument *document)
static void	tiff_document_get_resolution (TiffDocument *tiff_document, gfloat *x_res, gfloat *y_res)
static void	tiff_document_get_page_size (EvDocument *document, EvPage *page, double *width, double *height)
static cairo_surface_t *	tiff_document_render (EvDocument *document, EvRenderContext *rc)
static GdkPixbuf *	tiff_document_get_thumbnail (EvDocument *document, EvRenderContext *rc)
static gchar *	tiff_document_get_page_label (EvDocument *document, EvPage *page)
static void	tiff_document_finalize (GObject *object)
static void	tiff_document_class_init (TiffDocumentClass *klass)
static void	tiff_document_file_exporter_begin (EvFileExporter *exporter, EvFileExporterContext *fc)
static void	tiff_document_file_exporter_do_page (EvFileExporter *exporter, EvRenderContext *rc)
static void	tiff_document_file_exporter_end (EvFileExporter *exporter)
static EvFileExporterCapabilities	tiff_document_file_exporter_get_capabilities (EvFileExporter *exporter)
static void	tiff_document_init (TiffDocument *tiff_document)

Variables
static TIFFErrorHandler	orig_error_handler = NULL
static TIFFErrorHandler	orig_warning_handler = NULL

Typedef Documentation

typedef struct _TiffDocumentClass TiffDocumentClass

Definition at line 53 of file tiff-document.c.

Function Documentation

EV_BACKEND_REGISTER_WITH_CODE	(	TiffDocument	,
		tiff_document	,
		{EV_BACKEND_IMPLEMENT_INTERFACE(EV_TYPE_FILE_EXPORTER, tiff_document_document_file_exporter_iface_init);}
	)

static void pop_handlers ( void  )

static

Definition at line 74 of file tiff-document.c.

{
    TIFFSetErrorHandler (orig_error_handler);
    TIFFSetWarningHandler (orig_warning_handler);
}

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static void push_handlers ( void  )

static

Definition at line 67 of file tiff-document.c.

{
    orig_error_handler = TIFFSetErrorHandler (NULL);
    orig_warning_handler = TIFFSetWarningHandler (NULL);
}

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static void tiff_document_class_init ( TiffDocumentClass *  klass)

static

Definition at line 442 of file tiff-document.c.

{
    GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
    EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);

    gobject_class->finalize = tiff_document_finalize;

    ev_document_class->load = tiff_document_load;
    ev_document_class->save = tiff_document_save;
    ev_document_class->get_n_pages = tiff_document_get_n_pages;
    ev_document_class->get_page_size = tiff_document_get_page_size;
    ev_document_class->render = tiff_document_render;
    ev_document_class->get_thumbnail = tiff_document_get_thumbnail;
    ev_document_class->get_page_label = tiff_document_get_page_label;
}

static void tiff_document_document_file_exporter_iface_init ( EvFileExporterInterface *  iface)

static

Definition at line 502 of file tiff-document.c.

{
    iface->begin = tiff_document_file_exporter_begin;
    iface->do_page = tiff_document_file_exporter_do_page;
    iface->end = tiff_document_file_exporter_end;
    iface->get_capabilities = tiff_document_file_exporter_get_capabilities;
}

static void tiff_document_file_exporter_begin ( EvFileExporter *  exporter, EvFileExporterContext *  fc  )

static

Definition at line 460 of file tiff-document.c.

{
    TiffDocument *document = TIFF_DOCUMENT (exporter);

    document->ps_export_ctx = tiff2ps_context_new(fc->filename);
}

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static void tiff_document_file_exporter_do_page ( EvFileExporter *  exporter, EvRenderContext *  rc  )

static

Definition at line 469 of file tiff-document.c.

{
    TiffDocument *document = TIFF_DOCUMENT (exporter);

    if (document->ps_export_ctx == NULL)
        return;
    if (TIFFSetDirectory (document->tiff, rc->page->index) != 1)
        return;
    tiff2ps_process_page (document->ps_export_ctx, document->tiff,
                  0, 0, 0, 0, 0);
}

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static void tiff_document_file_exporter_end ( EvFileExporter *  exporter)

static

Definition at line 482 of file tiff-document.c.

{
    TiffDocument *document = TIFF_DOCUMENT (exporter);

    if (document->ps_export_ctx == NULL)
        return;
    tiff2ps_context_finalize(document->ps_export_ctx);
}

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static EvFileExporterCapabilities tiff_document_file_exporter_get_capabilities ( EvFileExporter *  exporter)

static

Definition at line 492 of file tiff-document.c.

{
    return  EV_FILE_EXPORTER_CAN_PAGE_SET |
        EV_FILE_EXPORTER_CAN_COPIES |
        EV_FILE_EXPORTER_CAN_COLLATE |
        EV_FILE_EXPORTER_CAN_REVERSE |
        EV_FILE_EXPORTER_CAN_GENERATE_PS;
}

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static void tiff_document_finalize ( GObject *  object)

static

Definition at line 429 of file tiff-document.c.

{
    TiffDocument *tiff_document = TIFF_DOCUMENT (object);

    if (tiff_document->tiff)
        TIFFClose (tiff_document->tiff);
    if (tiff_document->uri)
        g_free (tiff_document->uri);

    G_OBJECT_CLASS (tiff_document_parent_class)->finalize (object);
}

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static int tiff_document_get_n_pages ( EvDocument *  document)

static

Definition at line 149 of file tiff-document.c.

{
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);
    
    g_return_val_if_fail (TIFF_IS_DOCUMENT (document), 0);
    g_return_val_if_fail (tiff_document->tiff != NULL, 0);
    
    if (tiff_document->n_pages == -1) {
        push_handlers ();
        tiff_document->n_pages = 0;
        
        do {
            tiff_document->n_pages ++;
        }
        while (TIFFReadDirectory (tiff_document->tiff));
        pop_handlers ();
    }

    return tiff_document->n_pages;
}

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static gchar* tiff_document_get_page_label ( EvDocument *  document, EvPage *  page  )

static

Definition at line 414 of file tiff-document.c.

{
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);
    static gchar *label;

    if (TIFFGetField (tiff_document->tiff, TIFFTAG_PAGENAME, &label) &&
        g_utf8_validate (label, -1, NULL)) {
        return g_strdup (label);
    }

    return NULL;
}

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static void tiff_document_get_page_size ( EvDocument *  document, EvPage *  page, double *  width, double *  height  )

static

Definition at line 195 of file tiff-document.c.

{
    guint32 w, h;
    gfloat x_res, y_res;
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);
    
    g_return_if_fail (TIFF_IS_DOCUMENT (document));
    g_return_if_fail (tiff_document->tiff != NULL);
    
    push_handlers ();
    if (TIFFSetDirectory (tiff_document->tiff, page->index) != 1) {
        pop_handlers ();
        return;
    }
    
    TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &w);
    TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &h);
    tiff_document_get_resolution (tiff_document, &x_res, &y_res);
    h = h * (x_res / y_res);
    
    *width = w;
    *height = h;
    
    pop_handlers ();
}

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static void tiff_document_get_resolution ( TiffDocument *  tiff_document, gfloat *  x_res, gfloat *  y_res  )

static

Definition at line 171 of file tiff-document.c.

{
    gfloat x = 0.0;
    gfloat y = 0.0;
    gushort unit;

    if (TIFFGetField (tiff_document->tiff, TIFFTAG_XRESOLUTION, &x) &&
        TIFFGetField (tiff_document->tiff, TIFFTAG_YRESOLUTION, &y)) {
        if (TIFFGetFieldDefaulted (tiff_document->tiff, TIFFTAG_RESOLUTIONUNIT, &unit)) {
            if (unit == RESUNIT_CENTIMETER) {
                x *= 2.54;
                y *= 2.54;
            }
        }
    }

    /* Handle 0 values: some software set TIFF resolution as `0 , 0` see bug #646414 */
    *x_res = x > 0 ? x : 72.0;
    *y_res = y > 0 ? y : 72.0;
}

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static GdkPixbuf* tiff_document_get_thumbnail ( EvDocument *  document, EvRenderContext *  rc  )

static

Definition at line 340 of file tiff-document.c.

{
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);
    int width, height;
    int scaled_width, scaled_height;
    float x_res, y_res;
    gint rowstride, bytes;
    guchar *pixels = NULL;
    GdkPixbuf *pixbuf;
    GdkPixbuf *scaled_pixbuf;
    GdkPixbuf *rotated_pixbuf;
    
    push_handlers ();
    if (TIFFSetDirectory (tiff_document->tiff, rc->page->index) != 1) {
        pop_handlers ();
        return NULL;
    }

    if (!TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &width)) {
        pop_handlers ();
        return NULL;
    }

    if (! TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &height)) {
        pop_handlers ();
        return NULL;
    }

    tiff_document_get_resolution (tiff_document, &x_res, &y_res);
    
    pop_handlers ();
  
    /* Sanity check the doc */
    if (width <= 0 || height <= 0)
        return NULL;                

    rowstride = width * 4;
    if (rowstride / 4 != width)
        /* overflow */
        return NULL;                
        
    bytes = height * rowstride;
    if (bytes / rowstride != height)
        /* overflow */
        return NULL;                
    
    pixels = g_try_malloc (bytes);
    if (!pixels)
        return NULL;
    
    pixbuf = gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8, 
                       width, height, rowstride,
                       (GdkPixbufDestroyNotify) g_free, NULL);
    TIFFReadRGBAImageOriented (tiff_document->tiff,
                   width, height,
                   (uint32 *)pixels,
                   ORIENTATION_TOPLEFT, 0);
    pop_handlers ();

    ev_render_context_compute_scaled_size (rc, width, height * (x_res / y_res),
                           &scaled_width, &scaled_height);
    scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf,
                         scaled_width, scaled_height,
                         GDK_INTERP_BILINEAR);
    g_object_unref (pixbuf);
    
    rotated_pixbuf = gdk_pixbuf_rotate_simple (scaled_pixbuf, 360 - rc->rotation);
    g_object_unref (scaled_pixbuf);
    
    return rotated_pixbuf;
}

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static void tiff_document_init ( TiffDocument *  tiff_document)

static

Definition at line 511 of file tiff-document.c.

{
    tiff_document->n_pages = -1;
}

static gboolean tiff_document_load ( EvDocument *  document, const char *  uri, GError **  error  )

static

Definition at line 81 of file tiff-document.c.

{
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);
    gchar *filename;
    TIFF *tiff;
    
    filename = g_filename_from_uri (uri, NULL, error);
    if (!filename)
        return FALSE;
    
    push_handlers ();

#ifdef G_OS_WIN32
{
    wchar_t *wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, error);
    if (wfilename == NULL) {
        return FALSE;
    }

    tiff = TIFFOpenW (wfilename, "r");

    g_free (wfilename);
}
#else
    tiff = TIFFOpen (filename, "r");
#endif
    if (tiff) {
        guint32 w, h;
        
        /* FIXME: unused data? why bother here */
        TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &w);
        TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &h);
    }
    
    if (!tiff) {
        pop_handlers ();

            g_set_error_literal (error,
                     EV_DOCUMENT_ERROR,
                     EV_DOCUMENT_ERROR_INVALID,
                     _("Invalid document"));

        g_free (filename);
        return FALSE;
    }
    
    tiff_document->tiff = tiff;
    g_free (tiff_document->uri);
    g_free (filename);
    tiff_document->uri = g_strdup (uri);
    
    pop_handlers ();
    return TRUE;
}

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static cairo_surface_t* tiff_document_render ( EvDocument *  document, EvRenderContext *  rc  )

static

Definition at line 225 of file tiff-document.c.

{
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);
    int width, height;
    int scaled_width, scaled_height;
    float x_res, y_res;
    gint rowstride, bytes;
    guchar *pixels = NULL;
    guchar *p;
    int orientation;
    cairo_surface_t *surface;
    cairo_surface_t *rotated_surface;
    static const cairo_user_data_key_t key;
    
    g_return_val_if_fail (TIFF_IS_DOCUMENT (document), NULL);
    g_return_val_if_fail (tiff_document->tiff != NULL, NULL);
  
    push_handlers ();
    if (TIFFSetDirectory (tiff_document->tiff, rc->page->index) != 1) {
        pop_handlers ();
        g_warning("Failed to select page %d", rc->page->index);
        return NULL;
    }

    if (!TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &width)) {
        pop_handlers ();
        g_warning("Failed to read image width");
        return NULL;
    }

    if (! TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &height)) {
        pop_handlers ();
        g_warning("Failed to read image height");
        return NULL;
    }

    if (! TIFFGetField (tiff_document->tiff, TIFFTAG_ORIENTATION, &orientation)) {
        orientation = ORIENTATION_TOPLEFT;
    }

    tiff_document_get_resolution (tiff_document, &x_res, &y_res);
    
    pop_handlers ();
  
    /* Sanity check the doc */
    if (width <= 0 || height <= 0) {
        g_warning("Invalid width or height.");
        return NULL;
    }

#ifdef HAVE_CAIRO_FORMAT_STRIDE_FOR_WIDTH
    rowstride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
#else
    rowstride = width * 4;
#endif
    if (rowstride / 4 != width) {
        g_warning("Overflow while rendering document.");
        /* overflow, or cairo was changed in an unsupported way */
        return NULL;                
    }
    
    bytes = height * rowstride;
    if (bytes / rowstride != height) {
        g_warning("Overflow while rendering document.");
        /* overflow */
        return NULL;
    }
    
    pixels = g_try_malloc (bytes);
    if (!pixels) {
        g_warning("Failed to allocate memory for rendering.");
        return NULL;
    }
    
    surface = cairo_image_surface_create_for_data (pixels,
                               CAIRO_FORMAT_RGB24,
                               width, height,
                               rowstride);
    cairo_surface_set_user_data (surface, &key,
                     pixels, (cairo_destroy_func_t)g_free);

    TIFFReadRGBAImageOriented (tiff_document->tiff,
                   width, height,
                   (uint32 *)pixels,
                   orientation, 0);
    pop_handlers ();

    /* Convert the format returned by libtiff to
    * what cairo expects
    */
    p = pixels;
    while (p < pixels + bytes) {
        guint32 *pixel = (guint32*)p;
        guint8 r = TIFFGetR(*pixel);
        guint8 g = TIFFGetG(*pixel);
        guint8 b = TIFFGetB(*pixel);
        guint8 a = TIFFGetA(*pixel);

        *pixel = (a << 24) | (r << 16) | (g << 8) | b;

        p += 4;
    }

    ev_render_context_compute_scaled_size (rc, width, height * (x_res / y_res),
                           &scaled_width, &scaled_height);
    rotated_surface = ev_document_misc_surface_rotate_and_scale (surface,
                                     scaled_width, scaled_height,
                                     rc->rotation);
    cairo_surface_destroy (surface);
    
    return rotated_surface;
}

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static gboolean tiff_document_save ( EvDocument *  document, const char *  uri, GError **  error  )

static

Definition at line 139 of file tiff-document.c.

{       
    TiffDocument *tiff_document = TIFF_DOCUMENT (document);

    return ev_xfer_uri_simple (tiff_document->uri, uri, error); 
}

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Variable Documentation

TIFFErrorHandler orig_error_handler = NULL

static

Definition at line 63 of file tiff-document.c.

TIFFErrorHandler orig_warning_handler = NULL

static

Definition at line 64 of file tiff-document.c.