cairo/src/cairo-paginated-surface.c

/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2005 Red Hat, Inc
 * Copyright © 2007 Adrian Johnson
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is Red Hat, Inc.
 *
 * Contributor(s):
 *	Carl Worth <cworth@cworth.org>
 *	Keith Packard <keithp@keithp.com>
 *	Adrian Johnson <ajohnson@redneon.com>
 */

/* The paginated surface layer exists to provide as much code sharing
 * as possible for the various paginated surface backends in cairo
 * (PostScript, PDF, etc.). See cairo-paginated-private.h for
 * more details on how it works and how to use it.
 */

#include "cairoint.h"

#include "cairo-paginated-private.h"
#include "cairo-paginated-surface-private.h"
#include "cairo-meta-surface-private.h"
#include "cairo-analysis-surface-private.h"

static const cairo_surface_backend_t cairo_paginated_surface_backend;

static cairo_int_status_t
_cairo_paginated_surface_show_page (void *abstract_surface);

static cairo_surface_t *
_cairo_paginated_surface_create_similar (void			*abstract_surface,
					 cairo_content_t	 content,
					 int			 width,
					 int			 height)
{
    cairo_rectangle_t rect;
    rect.x = rect.y = 0.;
    rect.width = width;
    rect.height = height;
    return cairo_meta_surface_create (content, &rect);
}

static cairo_surface_t *
_create_meta_surface_for_target (cairo_surface_t *target,
				 cairo_content_t content)
{
    cairo_rectangle_int_t rect;

    if (_cairo_surface_get_extents (target, &rect)) {
	cairo_rectangle_t meta_extents;

	meta_extents.x = rect.x;
	meta_extents.y = rect.y;
	meta_extents.width = rect.width;
	meta_extents.height = rect.height;

	return cairo_meta_surface_create (content, &meta_extents);
    } else {
	return cairo_meta_surface_create (content, NULL);
    }
}

cairo_surface_t *
_cairo_paginated_surface_create (cairo_surface_t				*target,
				 cairo_content_t				 content,
				 const cairo_paginated_surface_backend_t	*backend)
{
    cairo_paginated_surface_t *surface;
    cairo_status_t status;

    surface = malloc (sizeof (cairo_paginated_surface_t));
    if (unlikely (surface == NULL)) {
	status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
	goto FAIL;
    }

    _cairo_surface_init (&surface->base, &cairo_paginated_surface_backend,
			 content);

    /* Override surface->base.type with target's type so we don't leak
     * evidence of the paginated wrapper out to the user. */
    surface->base.type = target->type;

    surface->target = cairo_surface_reference (target);

    surface->content = content;
    surface->backend = backend;

    surface->meta = _create_meta_surface_for_target (target, content);
    status = surface->meta->status;
    if (unlikely (status))
	goto FAIL_CLEANUP_SURFACE;

    surface->page_num = 1;
    surface->page_is_blank = TRUE;

    return &surface->base;

  FAIL_CLEANUP_SURFACE:
    cairo_surface_destroy (target);
    free (surface);
  FAIL:
    return _cairo_surface_create_in_error (status);
}

cairo_bool_t
_cairo_surface_is_paginated (cairo_surface_t *surface)
{
    return surface->backend == &cairo_paginated_surface_backend;
}

cairo_surface_t *
_cairo_paginated_surface_get_target (cairo_surface_t *surface)
{
    cairo_paginated_surface_t *paginated_surface;

    assert (_cairo_surface_is_paginated (surface));

    paginated_surface = (cairo_paginated_surface_t *) surface;

    return paginated_surface->target;
}

static cairo_status_t
_cairo_paginated_surface_finish (void *abstract_surface)
{
    cairo_paginated_surface_t *surface = abstract_surface;
    cairo_status_t status = CAIRO_STATUS_SUCCESS;

    if (surface->page_is_blank == FALSE || surface->page_num == 1) {
	cairo_surface_show_page (abstract_surface);
	status = cairo_surface_status (abstract_surface);
    }

     /* XXX We want to propagate any errors from destroy(), but those are not
      * returned via the api. So we need to explicitly finish the target,
      * and check the status afterwards. However, we can only call finish()
      * on the target, if we own it.
      */
    if (CAIRO_REFERENCE_COUNT_GET_VALUE (&surface->target->ref_count) == 1) {
	cairo_surface_finish (surface->target);
	if (status == CAIRO_STATUS_SUCCESS)
	    status = cairo_surface_status (surface->target);
    }
    cairo_surface_destroy (surface->target);

    cairo_surface_finish (surface->meta);
    if (status == CAIRO_STATUS_SUCCESS)
	status = cairo_surface_status (surface->meta);
    cairo_surface_destroy (surface->meta);

    return status;
}

static cairo_surface_t *
_cairo_paginated_surface_create_image_surface (void	       *abstract_surface,
					       int		width,
					       int		height)
{
    cairo_paginated_surface_t *surface = abstract_surface;
    cairo_surface_t *image;
    cairo_font_options_t options;

    image = _cairo_image_surface_create_with_content (surface->content,
						      width,
						      height);

    cairo_surface_get_font_options (&surface->base, &options);
    _cairo_surface_set_font_options (image, &options);

    return image;
}

static cairo_status_t
_cairo_paginated_surface_acquire_source_image (void	       *abstract_surface,
					       cairo_image_surface_t **image_out,
					       void		   **image_extra)
{
    cairo_paginated_surface_t *surface = abstract_surface;
    cairo_bool_t is_bounded;
    cairo_surface_t *image;
    cairo_status_t status;
    cairo_rectangle_int_t extents;

    is_bounded = _cairo_surface_get_extents (surface->target, &extents);
    if (! is_bounded)
	return CAIRO_INT_STATUS_UNSUPPORTED;

    image = _cairo_paginated_surface_create_image_surface (surface,
							   extents.width,
							   extents.height);

    status = cairo_meta_surface_replay (surface->meta, image);
    if (unlikely (status)) {
	cairo_surface_destroy (image);
	return status;
    }

    *image_out = (cairo_image_surface_t*) image;
    *image_extra = NULL;

    return CAIRO_STATUS_SUCCESS;
}

static void
_cairo_paginated_surface_release_source_image (void	  *abstract_surface,
					       cairo_image_surface_t *image,
					       void	       *image_extra)
{
    cairo_surface_destroy (&image->base);
}

static cairo_int_status_t
_paint_fallback_image (cairo_paginated_surface_t *surface,
		       cairo_rectangle_int_t     *rect)
{
    double x_scale = surface->base.x_fallback_resolution / surface->target->x_resolution;
    double y_scale = surface->base.y_fallback_resolution / surface->target->y_resolution;
    int x, y, width, height;
    cairo_status_t status;
    cairo_surface_t *image;
    cairo_surface_pattern_t pattern;
    cairo_clip_t clip;

    x = rect->x;
    y = rect->y;
    width = rect->width;
    height = rect->height;
    image = _cairo_paginated_surface_create_image_surface (surface,
							   ceil (width  * x_scale),
							   ceil (height * y_scale));
    _cairo_surface_set_device_scale (image, x_scale, y_scale);
    /* set_device_offset just sets the x0/y0 components of the matrix;
     * so we have to do the scaling manually. */
    cairo_surface_set_device_offset (image, -x*x_scale, -y*y_scale);

    status = cairo_meta_surface_replay (surface->meta, image);
    if (unlikely (status))
	goto CLEANUP_IMAGE;

    _cairo_pattern_init_for_surface (&pattern, image);
    cairo_matrix_init (&pattern.base.matrix,
		       x_scale, 0, 0, y_scale, -x*x_scale, -y*y_scale);
    /* the fallback should be rendered at native resolution, so disable
     * filtering (if possible) to avoid introducing potential artifacts. */
    pattern.base.filter = CAIRO_FILTER_NEAREST;

    status = _cairo_clip_init_rectangle (&clip, rect);
    if (unlikely (status))
	goto CLEANUP_IMAGE;

    status = _cairo_surface_paint (surface->target,
				   CAIRO_OPERATOR_SOURCE,
				   &pattern.base, &clip);

    _cairo_clip_reset (&clip);

    _cairo_pattern_fini (&pattern.base);
CLEANUP_IMAGE:
    cairo_surface_destroy (image);

    return status;
}

static cairo_int_status_t
_paint_page (cairo_paginated_surface_t *surface)
{
    cairo_surface_t *analysis;
    cairo_status_t status;
    cairo_bool_t has_supported, has_page_fallback, has_finegrained_fallback;

    if (unlikely (surface->target->status))
	return surface->target->status;

    analysis = _cairo_analysis_surface_create (surface->target);
    if (unlikely (analysis->status))
	return _cairo_surface_set_error (surface->target, analysis->status);

    surface->backend->set_paginated_mode (surface->target,
	                                  CAIRO_PAGINATED_MODE_ANALYZE);
    status = _cairo_meta_surface_replay_and_create_regions (surface->meta,
	                                                    analysis);
    if (status || analysis->status) {
	if (status == CAIRO_STATUS_SUCCESS)
	    status = analysis->status;
	goto FAIL;
    }

     if (surface->backend->set_bounding_box) {
	 cairo_box_t bbox;

	 _cairo_analysis_surface_get_bounding_box (analysis, &bbox);
	 status = surface->backend->set_bounding_box (surface->target, &bbox);
	 if (unlikely (status))
	     goto FAIL;
     }

    if (surface->backend->set_fallback_images_required) {
	cairo_bool_t has_fallbacks = _cairo_analysis_surface_has_unsupported (analysis);

	status = surface->backend->set_fallback_images_required (surface->target,
								 has_fallbacks);
	if (unlikely (status))
	    goto FAIL;
    }

    /* Finer grained fallbacks are currently only supported for some
     * surface types */
    if (surface->backend->supports_fine_grained_fallbacks != NULL &&
	surface->backend->supports_fine_grained_fallbacks (surface->target))
    {
	has_supported = _cairo_analysis_surface_has_supported (analysis);
	has_page_fallback = FALSE;
	has_finegrained_fallback = _cairo_analysis_surface_has_unsupported (analysis);
    }
    else
    {
	if (_cairo_analysis_surface_has_unsupported (analysis)) {
	    has_supported = FALSE;
	    has_page_fallback = TRUE;
	} else {
	    has_supported = TRUE;
	    has_page_fallback = FALSE;
	}
	has_finegrained_fallback = FALSE;
    }

    if (has_supported) {
	surface->backend->set_paginated_mode (surface->target,
		                              CAIRO_PAGINATED_MODE_RENDER);

	status = _cairo_meta_surface_replay_region (surface->meta,
						    surface->target,
						    CAIRO_META_REGION_NATIVE);
	assert (status != CAIRO_INT_STATUS_UNSUPPORTED);
	if (unlikely (status))
	    goto FAIL;
    }

    if (has_page_fallback) {
	cairo_rectangle_int_t extents;
	cairo_bool_t is_bounded;

	surface->backend->set_paginated_mode (surface->target,
		                              CAIRO_PAGINATED_MODE_FALLBACK);

	is_bounded = _cairo_surface_get_extents (surface->target, &extents);
	if (! is_bounded) {
	    status = CAIRO_INT_STATUS_UNSUPPORTED;
	    goto FAIL;
	}

	status = _paint_fallback_image (surface, &extents);
	if (unlikely (status))
	    goto FAIL;
    }

    if (has_finegrained_fallback) {
        cairo_region_t *region;
        int num_rects, i;

	surface->backend->set_paginated_mode (surface->target,
		                              CAIRO_PAGINATED_MODE_FALLBACK);

	region = _cairo_analysis_surface_get_unsupported (analysis);

	num_rects = cairo_region_num_rectangles (region);
	for (i = 0; i < num_rects; i++) {
	    cairo_rectangle_int_t rect;

	    cairo_region_get_rectangle (region, i, &rect);
	    status = _paint_fallback_image (surface, &rect);
	    if (unlikely (status))
		goto FAIL;
	}
    }

  FAIL:
    cairo_surface_destroy (analysis);

    return _cairo_surface_set_error (surface->target, status);
}

static cairo_status_t
_start_page (cairo_paginated_surface_t *surface)
{
    if (surface->target->status)
	return surface->target->status;

    if (! surface->backend->start_page)
	return CAIRO_STATUS_SUCCESS;

    return _cairo_surface_set_error (surface->target,
	                        surface->backend->start_page (surface->target));
}

static cairo_int_status_t
_cairo_paginated_surface_copy_page (void *abstract_surface)
{
    cairo_status_t status;
    cairo_paginated_surface_t *surface = abstract_surface;

    status = _start_page (surface);
    if (unlikely (status))
	return status;

    status = _paint_page (surface);
    if (unlikely (status))
	return status;

    surface->page_num++;

    /* XXX: It might make sense to add some support here for calling
     * cairo_surface_copy_page on the target surface. It would be an
     * optimization for the output, but the interaction with image
     * fallbacks gets tricky. For now, we just let the target see a
     * show_page and we implement the copying by simply not destroying
     * the meta-surface. */

    cairo_surface_show_page (surface->target);
    return cairo_surface_status (surface->target);
}

static cairo_int_status_t
_cairo_paginated_surface_show_page (void *abstract_surface)
{
    cairo_status_t status;
    cairo_paginated_surface_t *surface = abstract_surface;

    status = _start_page (surface);
    if (unlikely (status))
	return status;

    status = _paint_page (surface);
    if (unlikely (status))
	return status;

    cairo_surface_show_page (surface->target);
    status = surface->target->status;
    if (unlikely (status))
	return status;

    status = surface->meta->status;
    if (unlikely (status))
	return status;

    cairo_surface_destroy (surface->meta);

    surface->meta = _create_meta_surface_for_target (surface->target,
						     surface->content);
    status = surface->meta->status;
    if (unlikely (status))
	return status;

    surface->page_num++;
    surface->page_is_blank = TRUE;

    return CAIRO_STATUS_SUCCESS;
}

static cairo_bool_t
_cairo_paginated_surface_get_extents (void	              *abstract_surface,
				      cairo_rectangle_int_t   *rectangle)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    return _cairo_surface_get_extents (surface->target, rectangle);
}

static void
_cairo_paginated_surface_get_font_options (void                  *abstract_surface,
					   cairo_font_options_t  *options)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    cairo_surface_get_font_options (surface->target, options);
}

static cairo_int_status_t
_cairo_paginated_surface_paint (void			*abstract_surface,
				cairo_operator_t	 op,
				const cairo_pattern_t	*source,
				cairo_clip_t		*clip)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    /* Optimize away erasing of nothing. */
    if (surface->page_is_blank && op == CAIRO_OPERATOR_CLEAR)
	return CAIRO_STATUS_SUCCESS;

    surface->page_is_blank = FALSE;

    return _cairo_surface_paint (surface->meta, op, source, clip);
}

static cairo_int_status_t
_cairo_paginated_surface_mask (void		*abstract_surface,
			       cairo_operator_t	 op,
			       const cairo_pattern_t	*source,
			       const cairo_pattern_t	*mask,
			       cairo_clip_t		*clip)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    /* Optimize away erasing of nothing. */
    if (surface->page_is_blank && op == CAIRO_OPERATOR_CLEAR)
	return CAIRO_STATUS_SUCCESS;

    surface->page_is_blank = FALSE;

    return _cairo_surface_mask (surface->meta, op, source, mask, clip);
}

static cairo_int_status_t
_cairo_paginated_surface_stroke (void			*abstract_surface,
				 cairo_operator_t	 op,
				 const cairo_pattern_t	*source,
				 cairo_path_fixed_t	*path,
				 cairo_stroke_style_t	*style,
				 cairo_matrix_t		*ctm,
				 cairo_matrix_t		*ctm_inverse,
				 double			 tolerance,
				 cairo_antialias_t	 antialias,
				 cairo_clip_t		*clip)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    /* Optimize away erasing of nothing. */
    if (surface->page_is_blank && op == CAIRO_OPERATOR_CLEAR)
	return CAIRO_STATUS_SUCCESS;

    surface->page_is_blank = FALSE;

    return _cairo_surface_stroke (surface->meta, op, source,
				  path, style,
				  ctm, ctm_inverse,
				  tolerance, antialias,
				  clip);
}

static cairo_int_status_t
_cairo_paginated_surface_fill (void			*abstract_surface,
			       cairo_operator_t		 op,
			       const cairo_pattern_t	*source,
			       cairo_path_fixed_t	*path,
			       cairo_fill_rule_t	 fill_rule,
			       double			 tolerance,
			       cairo_antialias_t	 antialias,
			       cairo_clip_t		*clip)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    /* Optimize away erasing of nothing. */
    if (surface->page_is_blank && op == CAIRO_OPERATOR_CLEAR)
	return CAIRO_STATUS_SUCCESS;

    surface->page_is_blank = FALSE;

    return _cairo_surface_fill (surface->meta, op, source,
				path, fill_rule,
				tolerance, antialias,
				clip);
}

static cairo_bool_t
_cairo_paginated_surface_has_show_text_glyphs (void *abstract_surface)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    return cairo_surface_has_show_text_glyphs (surface->target);
}

static cairo_int_status_t
_cairo_paginated_surface_show_text_glyphs (void			    *abstract_surface,
					   cairo_operator_t	     op,
					   const cairo_pattern_t	    *source,
					   const char		    *utf8,
					   int			     utf8_len,
					   cairo_glyph_t		    *glyphs,
					   int			     num_glyphs,
					   const cairo_text_cluster_t *clusters,
					   int			     num_clusters,
					   cairo_text_cluster_flags_t cluster_flags,
					   cairo_scaled_font_t	    *scaled_font,
					   cairo_clip_t		    *clip)
{
    cairo_paginated_surface_t *surface = abstract_surface;

    /* Optimize away erasing of nothing. */
    if (surface->page_is_blank && op == CAIRO_OPERATOR_CLEAR)
	return CAIRO_STATUS_SUCCESS;

    surface->page_is_blank = FALSE;

    return _cairo_surface_show_text_glyphs (surface->meta, op, source,
					    utf8, utf8_len,
					    glyphs, num_glyphs,
					    clusters, num_clusters,
					    cluster_flags,
					    scaled_font,
					    clip);
}

static cairo_surface_t *
_cairo_paginated_surface_snapshot (void *abstract_other)
{
    cairo_paginated_surface_t *other = abstract_other;

    return _cairo_surface_snapshot (other->meta);
}

static const cairo_surface_backend_t cairo_paginated_surface_backend = {
    CAIRO_INTERNAL_SURFACE_TYPE_PAGINATED,
    _cairo_paginated_surface_create_similar,
    _cairo_paginated_surface_finish,
    _cairo_paginated_surface_acquire_source_image,
    _cairo_paginated_surface_release_source_image,
    NULL, /* acquire_dest_image */
    NULL, /* release_dest_image */
    NULL, /* clone_similar */
    NULL, /* composite */
    NULL, /* fill_rectangles */
    NULL, /* composite_trapezoids */
    NULL, /* create_span_renderer */
    NULL, /* check_span_renderer */
    _cairo_paginated_surface_copy_page,
    _cairo_paginated_surface_show_page,
    _cairo_paginated_surface_get_extents,
    NULL, /* old_show_glyphs */
    _cairo_paginated_surface_get_font_options,
    NULL, /* flush */
    NULL, /* mark_dirty_rectangle */
    NULL, /* scaled_font_fini */
    NULL, /* scaled_glyph_fini */
    _cairo_paginated_surface_paint,
    _cairo_paginated_surface_mask,
    _cairo_paginated_surface_stroke,
    _cairo_paginated_surface_fill,
    NULL, /* show_glyphs */
    _cairo_paginated_surface_snapshot,
    NULL, /* is_similar */
    NULL, /* fill_stroke */
    NULL, /* create_solid_pattern_surface */
    NULL, /* can_repaint_solid_pattern_surface */
    _cairo_paginated_surface_has_show_text_glyphs,
    _cairo_paginated_surface_show_text_glyphs
};