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cairo/src/cairo-type3-glyph-surface.c
Chris Wilson bed2701e1c Remove clip handling from generic surface layer. 
Handling clip as part of the surface state, as opposed to being part of
the operation state, is cumbersome and a hindrance to providing true proxy
surface support. For example, the clip must be copied from the surface
onto the fallback image, but this was forgotten causing undue hassle in
each backend. Another example is the contortion the meta surface
endures to ensure the clip is correctly recorded. By contrast passing the
clip along with the operation is quite simple and enables us to write
generic handlers for providing surface wrappers. (And in the future, we
should be able to write more esoteric wrappers, e.g. automatic 2x FSAA,
trivially.)

In brief, instead of the surface automatically applying the clip before
calling the backend, the backend can call into a generic helper to apply
clipping. For raster surfaces, clip regions are handled automatically as
part of the composite interface. For vector surfaces, a clip helper is
introduced to replay and callback into an intersect_clip_path() function
as necessary.

Whilst this is not primarily a performance related change (the change
should just move the computation of the clip from the moment it is applied
by the user to the moment it is required by the backend), it is important
to track any potential regression:

ppc:
Speedups
========
image-rgba         evolution-20090607-0    1026085.22 0.18% -> 672972.07 0.77%:  1.52x speedup
▌
image-rgba         evolution-20090618-0    680579.98 0.12% -> 573237.66  0.16%:  1.19x speedup
▎
image-rgba      swfdec-fill-rate-4xaa-0    460296.92 0.36% -> 407464.63  0.42%:  1.13x speedup
▏
image-rgba      swfdec-fill-rate-2xaa-0    128431.95 0.47% -> 115051.86  0.42%:  1.12x speedup
▏
Slowdowns
=========
image-rgba     firefox-periodic-table-0    56837.61 0.78% -> 66055.17    3.20%:  1.09x slowdown
▏
2009-07-23 15:32:14 +01:00

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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2008 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 Adrian Johnson.
*
* Contributor(s):
* Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairoint.h"
#if CAIRO_HAS_FONT_SUBSET
#include "cairo-type3-glyph-surface-private.h"
#include "cairo-output-stream-private.h"
#include "cairo-meta-surface-private.h"
#include "cairo-analysis-surface-private.h"
#include "cairo-surface-clipper-private.h"
static const cairo_surface_backend_t cairo_type3_glyph_surface_backend;
static cairo_status_t
_cairo_type3_glyph_surface_clipper_intersect_clip_path (cairo_surface_clipper_t *clipper,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_type3_glyph_surface_t *surface = cairo_container_of (clipper,
cairo_type3_glyph_surface_t,
clipper);
if (path == NULL) {
_cairo_output_stream_printf (surface->stream, "Q q\n");
return CAIRO_STATUS_SUCCESS;
}
return _cairo_pdf_operators_clip (&surface->pdf_operators,
path,
fill_rule);
}
cairo_surface_t *
_cairo_type3_glyph_surface_create (cairo_scaled_font_t *scaled_font,
cairo_output_stream_t *stream,
cairo_type3_glyph_surface_emit_image_t emit_image,
cairo_scaled_font_subsets_t *font_subsets)
{
cairo_type3_glyph_surface_t *surface;
cairo_matrix_t invert_y_axis;
if (unlikely (stream != NULL && stream->status))
return _cairo_surface_create_in_error (stream->status);
surface = malloc (sizeof (cairo_type3_glyph_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
_cairo_surface_init (&surface->base, &cairo_type3_glyph_surface_backend,
CAIRO_CONTENT_COLOR_ALPHA);
surface->scaled_font = scaled_font;
surface->stream = stream;
surface->emit_image = emit_image;
/* Setup the transform from the user-font device space to Type 3
* font space. The Type 3 font space is defined by the FontMatrix
* entry in the Type 3 dictionary. In the PDF backend this is an
* identity matrix. */
surface->cairo_to_pdf = scaled_font->scale_inverse;
cairo_matrix_init_scale (&invert_y_axis, 1, -1);
cairo_matrix_multiply (&surface->cairo_to_pdf, &surface->cairo_to_pdf, &invert_y_axis);
_cairo_pdf_operators_init (&surface->pdf_operators,
surface->stream,
&surface->cairo_to_pdf,
font_subsets);
_cairo_surface_clipper_init (&surface->clipper,
_cairo_type3_glyph_surface_clipper_intersect_clip_path);
return &surface->base;
}
static cairo_status_t
_cairo_type3_glyph_surface_emit_image (cairo_type3_glyph_surface_t *surface,
cairo_image_surface_t *image,
cairo_matrix_t *image_matrix)
{
cairo_status_t status;
/* The only image type supported by Type 3 fonts are 1-bit masks */
image = _cairo_image_surface_coerce (image, CAIRO_FORMAT_A1);
status = image->base.status;
if (unlikely (status))
return status;
_cairo_output_stream_printf (surface->stream,
"q %f %f %f %f %f %f cm\n",
image_matrix->xx,
image_matrix->xy,
image_matrix->yx,
image_matrix->yy,
image_matrix->x0,
image_matrix->y0);
status = surface->emit_image (image, surface->stream);
cairo_surface_destroy (&image->base);
_cairo_output_stream_printf (surface->stream,
"Q\n");
return status;
}
static cairo_status_t
_cairo_type3_glyph_surface_emit_image_pattern (cairo_type3_glyph_surface_t *surface,
cairo_image_surface_t *image,
const cairo_matrix_t *pattern_matrix)
{
cairo_matrix_t mat, upside_down;
cairo_status_t status;
if (image->width == 0 || image->height == 0)
return CAIRO_STATUS_SUCCESS;
mat = *pattern_matrix;
/* Get the pattern space to user space matrix */
status = cairo_matrix_invert (&mat);
/* cairo_pattern_set_matrix ensures the matrix is invertible */
assert (status == CAIRO_STATUS_SUCCESS);
/* Make this a pattern space to Type 3 font space matrix */
cairo_matrix_multiply (&mat, &mat, &surface->cairo_to_pdf);
/* PDF images are in a 1 unit by 1 unit image space. Turn the 1 by
* 1 image upside down to convert to flip the Y-axis going from
* cairo to PDF. Then scale the image up to the required size. */
cairo_matrix_scale (&mat, image->width, image->height);
cairo_matrix_init (&upside_down, 1, 0, 0, -1, 0, 1);
cairo_matrix_multiply (&mat, &upside_down, &mat);
return _cairo_type3_glyph_surface_emit_image (surface, image, &mat);
}
static cairo_status_t
_cairo_type3_glyph_surface_finish (void *abstract_surface)
{
cairo_type3_glyph_surface_t *surface = abstract_surface;
return _cairo_pdf_operators_fini (&surface->pdf_operators);
}
static cairo_int_status_t
_cairo_type3_glyph_surface_paint (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_clip_t *clip)
{
cairo_type3_glyph_surface_t *surface = abstract_surface;
const cairo_surface_pattern_t *pattern;
cairo_image_surface_t *image;
void *image_extra;
cairo_status_t status;
if (source->type != CAIRO_PATTERN_TYPE_SURFACE)
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
status = _cairo_surface_clipper_set_clip (&surface->clipper, clip);
if (unlikely (status))
return status;
pattern = (const cairo_surface_pattern_t *) source;
status = _cairo_surface_acquire_source_image (pattern->surface,
&image, &image_extra);
if (unlikely (status))
goto fail;
status = _cairo_type3_glyph_surface_emit_image_pattern (surface,
image,
&pattern->base.matrix);
fail:
_cairo_surface_release_source_image (pattern->surface, image, image_extra);
return status;
}
static cairo_int_status_t
_cairo_type3_glyph_surface_mask (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
cairo_clip_t *clip)
{
return _cairo_type3_glyph_surface_paint (abstract_surface,
op, mask,
clip);
}
static cairo_int_status_t
_cairo_type3_glyph_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_type3_glyph_surface_t *surface = abstract_surface;
cairo_int_status_t status;
status = _cairo_surface_clipper_set_clip (&surface->clipper, clip);
if (unlikely (status))
return status;
return _cairo_pdf_operators_stroke (&surface->pdf_operators,
path,
style,
ctm,
ctm_inverse);
}
static cairo_int_status_t
_cairo_type3_glyph_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_type3_glyph_surface_t *surface = abstract_surface;
cairo_int_status_t status;
status = _cairo_surface_clipper_set_clip (&surface->clipper, clip);
if (unlikely (status))
return status;
return _cairo_pdf_operators_fill (&surface->pdf_operators,
path,
fill_rule);
}
static cairo_int_status_t
_cairo_type3_glyph_surface_show_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
cairo_clip_t *clip,
int *remaining_glyphs)
{
cairo_type3_glyph_surface_t *surface = abstract_surface;
cairo_int_status_t status;
cairo_scaled_font_t *font;
cairo_matrix_t new_ctm, ctm_inverse;
int i;
status = _cairo_surface_clipper_set_clip (&surface->clipper, clip);
if (unlikely (status))
return status;
for (i = 0; i < num_glyphs; i++) {
cairo_matrix_transform_point (&surface->cairo_to_pdf,
&glyphs[i].x, &glyphs[i].y);
}
/* We require the matrix to be invertable. */
ctm_inverse = scaled_font->ctm;
status = cairo_matrix_invert (&ctm_inverse);
if (unlikely (status))
return CAIRO_INT_STATUS_IMAGE_FALLBACK;
cairo_matrix_multiply (&new_ctm, &scaled_font->ctm, &ctm_inverse);
font = cairo_scaled_font_create (scaled_font->font_face,
&scaled_font->font_matrix,
&new_ctm,
&scaled_font->options);
if (unlikely (font->status))
return font->status;
status = _cairo_pdf_operators_show_text_glyphs (&surface->pdf_operators,
NULL, 0,
glyphs, num_glyphs,
NULL, 0,
FALSE,
font);
cairo_scaled_font_destroy (font);
return status;
}
static const cairo_surface_backend_t cairo_type3_glyph_surface_backend = {
CAIRO_INTERNAL_SURFACE_TYPE_TYPE3_GLYPH,
NULL, /* _cairo_type3_glyph_surface_create_similar */
_cairo_type3_glyph_surface_finish,
NULL, /* acquire_source_image */
NULL, /* 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 */
NULL, /* cairo_type3_glyph_surface_copy_page */
NULL, /* _cairo_type3_glyph_surface_show_page */
NULL, /* _cairo_type3_glyph_surface_get_extents */
NULL, /* old_show_glyphs */
NULL, /* _cairo_type3_glyph_surface_get_font_options */
NULL, /* flush */
NULL, /* mark_dirty_rectangle */
NULL, /* scaled_font_fini */
NULL, /* scaled_glyph_fini */
_cairo_type3_glyph_surface_paint,
_cairo_type3_glyph_surface_mask,
_cairo_type3_glyph_surface_stroke,
_cairo_type3_glyph_surface_fill,
_cairo_type3_glyph_surface_show_glyphs,
NULL, /* snapshot */
};
static void
_cairo_type3_glyph_surface_set_stream (cairo_type3_glyph_surface_t *surface,
cairo_output_stream_t *stream)
{
surface->stream = stream;
_cairo_pdf_operators_set_stream (&surface->pdf_operators, stream);
}
static cairo_status_t
_cairo_type3_glyph_surface_emit_fallback_image (cairo_type3_glyph_surface_t *surface,
unsigned long glyph_index)
{
cairo_scaled_glyph_t *scaled_glyph;
cairo_status_t status;
cairo_image_surface_t *image;
cairo_matrix_t mat;
double x, y;
status = _cairo_scaled_glyph_lookup (surface->scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS |
CAIRO_SCALED_GLYPH_INFO_SURFACE,
&scaled_glyph);
if (unlikely (status))
return status;
image = scaled_glyph->surface;
if (image->width == 0 || image->height == 0)
return CAIRO_STATUS_SUCCESS;
x = _cairo_fixed_to_double (scaled_glyph->bbox.p1.x);
y = _cairo_fixed_to_double (scaled_glyph->bbox.p2.y);
mat.xx = image->width;
mat.xy = 0;
mat.yx = 0;
mat.yy = image->height;
mat.x0 = x;
mat.y0 = y;
cairo_matrix_multiply (&mat, &mat, &surface->scaled_font->scale_inverse);
mat.y0 *= -1;
return _cairo_type3_glyph_surface_emit_image (surface, image, &mat);
}
void
_cairo_type3_glyph_surface_set_font_subsets_callback (void *abstract_surface,
cairo_pdf_operators_use_font_subset_t use_font_subset,
void *closure)
{
cairo_type3_glyph_surface_t *surface = abstract_surface;
if (unlikely (surface->base.status))
return;
_cairo_pdf_operators_set_font_subsets_callback (&surface->pdf_operators,
use_font_subset,
closure);
}
cairo_status_t
_cairo_type3_glyph_surface_analyze_glyph (void *abstract_surface,
unsigned long glyph_index)
{
cairo_type3_glyph_surface_t *surface = abstract_surface;
cairo_scaled_glyph_t *scaled_glyph;
cairo_status_t status, status2;
cairo_output_stream_t *null_stream;
if (unlikely (surface->base.status))
return surface->base.status;
null_stream = _cairo_null_stream_create ();
if (unlikely (null_stream->status))
return null_stream->status;
_cairo_type3_glyph_surface_set_stream (surface, null_stream);
_cairo_scaled_font_freeze_cache (surface->scaled_font);
status = _cairo_scaled_glyph_lookup (surface->scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS |
CAIRO_SCALED_GLYPH_INFO_META_SURFACE,
&scaled_glyph);
if (_cairo_status_is_error (status))
goto cleanup;
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
status = CAIRO_STATUS_SUCCESS;
goto cleanup;
}
status = cairo_meta_surface_replay (scaled_glyph->meta_surface,
&surface->base);
if (unlikely (status))
goto cleanup;
status2 = _cairo_pdf_operators_flush (&surface->pdf_operators);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
if (status == CAIRO_INT_STATUS_IMAGE_FALLBACK)
status = CAIRO_STATUS_SUCCESS;
cleanup:
_cairo_scaled_font_thaw_cache (surface->scaled_font);
status2 = _cairo_output_stream_destroy (null_stream);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
return status;
}
cairo_status_t
_cairo_type3_glyph_surface_emit_glyph (void *abstract_surface,
cairo_output_stream_t *stream,
unsigned long glyph_index,
cairo_box_t *bbox,
double *width)
{
cairo_type3_glyph_surface_t *surface = abstract_surface;
cairo_scaled_glyph_t *scaled_glyph;
cairo_status_t status, status2;
double x_advance, y_advance;
cairo_matrix_t font_matrix_inverse;
if (unlikely (surface->base.status))
return surface->base.status;
_cairo_type3_glyph_surface_set_stream (surface, stream);
_cairo_scaled_font_freeze_cache (surface->scaled_font);
status = _cairo_scaled_glyph_lookup (surface->scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS |
CAIRO_SCALED_GLYPH_INFO_META_SURFACE,
&scaled_glyph);
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
status = _cairo_scaled_glyph_lookup (surface->scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS,
&scaled_glyph);
if (status == CAIRO_STATUS_SUCCESS)
status = CAIRO_INT_STATUS_IMAGE_FALLBACK;
}
if (_cairo_status_is_error (status)) {
_cairo_scaled_font_thaw_cache (surface->scaled_font);
return status;
}
x_advance = scaled_glyph->metrics.x_advance;
y_advance = scaled_glyph->metrics.y_advance;
font_matrix_inverse = surface->scaled_font->font_matrix;
status2 = cairo_matrix_invert (&font_matrix_inverse);
/* The invertability of font_matrix is tested in
* pdf_operators_show_glyphs before any glyphs are mappped to the
* subset. */
assert (status2 == CAIRO_STATUS_SUCCESS);
cairo_matrix_transform_distance (&font_matrix_inverse, &x_advance, &y_advance);
*width = x_advance;
*bbox = scaled_glyph->bbox;
_cairo_matrix_transform_bounding_box_fixed (&surface->scaled_font->scale_inverse,
bbox, NULL);
_cairo_output_stream_printf (surface->stream,
"%f 0 %f %f %f %f d1\n",
x_advance,
_cairo_fixed_to_double (bbox->p1.x),
- _cairo_fixed_to_double (bbox->p2.y),
_cairo_fixed_to_double (bbox->p2.x),
- _cairo_fixed_to_double (bbox->p1.y));
if (status == CAIRO_STATUS_SUCCESS) {
cairo_output_stream_t *mem_stream;
mem_stream = _cairo_memory_stream_create ();
status = mem_stream->status;
if (unlikely (status))
goto FAIL;
_cairo_type3_glyph_surface_set_stream (surface, mem_stream);
_cairo_output_stream_printf (surface->stream, "q\n");
status = cairo_meta_surface_replay (scaled_glyph->meta_surface,
&surface->base);
status2 = _cairo_pdf_operators_flush (&surface->pdf_operators);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
_cairo_output_stream_printf (surface->stream, "Q\n");
_cairo_type3_glyph_surface_set_stream (surface, stream);
if (status == CAIRO_STATUS_SUCCESS)
_cairo_memory_stream_copy (mem_stream, stream);
status2 = _cairo_output_stream_destroy (mem_stream);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
}
if (status == CAIRO_INT_STATUS_IMAGE_FALLBACK)
status = _cairo_type3_glyph_surface_emit_fallback_image (surface, glyph_index);
FAIL:
_cairo_scaled_font_thaw_cache (surface->scaled_font);
return status;
}
#endif /* CAIRO_HAS_FONT_SUBSET */
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