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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2009 Eric Anholt
* Copyright © 2009 Chris Wilson
* Copyright © 2005,2010 Red Hat, Inc
* Copyright © 2011 Intel Corporation
*
* 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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):
* Benjamin Otte <otte@gnome.org>
* Carl Worth <cworth@cworth.org>
* Chris Wilson <chris@chris-wilson.co.uk>
* Eric Anholt <eric@anholt.net>
*/
#include "cairoint.h"
#include "cairo-gl-private.h"
#include "cairo-composite-rectangles-private.h"
#include "cairo-compositor-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-spans-compositor-private.h"
#include "cairo-surface-backend-private.h"
typedef struct _cairo_gl_span_renderer {
cairo_span_renderer_t base;
cairo_gl_composite_t setup;
double opacity;
cairo_gl_emit_span_t emit;
int xmin, xmax;
int ymin, ymax;
cairo_gl_context_t *ctx;
} cairo_gl_span_renderer_t;
static cairo_status_t
_cairo_gl_bounded_opaque_spans (void *abstract_renderer,
int y, int height,
const cairo_half_open_span_t *spans,
unsigned num_spans)
{
cairo_gl_span_renderer_t *r = abstract_renderer;
cairo_gl_emit_span_t emit = r->emit;
if (num_spans == 0)
return CAIRO_STATUS_SUCCESS;
do {
if (spans[0].coverage) {
emit (r->ctx,
spans[0].x, y,
spans[1].x, y + height,
spans[0].coverage);
}
spans++;
} while (--num_spans > 1);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_bounded_spans (void *abstract_renderer,
int y, int height,
const cairo_half_open_span_t *spans,
unsigned num_spans)
{
cairo_gl_span_renderer_t *r = abstract_renderer;
cairo_gl_emit_span_t emit = r->emit;
if (num_spans == 0)
return CAIRO_STATUS_SUCCESS;
do {
if (spans[0].coverage) {
emit (r->ctx,
spans[0].x, y,
spans[1].x, y + height,
r->opacity * spans[0].coverage);
}
spans++;
} while (--num_spans > 1);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_unbounded_spans (void *abstract_renderer,
int y, int height,
const cairo_half_open_span_t *spans,
unsigned num_spans)
{
cairo_gl_span_renderer_t *r = abstract_renderer;
cairo_gl_emit_span_t emit = r->emit;
if (y > r->ymin) {
emit (r->ctx,
r->xmin, r->ymin,
r->xmax, y,
0);
}
if (num_spans == 0) {
emit (r->ctx,
r->xmin, y,
r->xmax, y + height,
0);
} else {
if (spans[0].x != r->xmin) {
emit (r->ctx,
r->xmin, y,
spans[0].x, y + height,
0);
}
do {
emit (r->ctx,
spans[0].x, y,
spans[1].x, y + height,
r->opacity * spans[0].coverage);
spans++;
} while (--num_spans > 1);
if (spans[0].x != r->xmax) {
emit (r->ctx,
spans[0].x, y,
r->xmax, y + height,
0);
}
}
r->ymin = y + height;
return CAIRO_STATUS_SUCCESS;
}
/* XXX */
static cairo_status_t
_cairo_gl_clipped_spans (void *abstract_renderer,
int y, int height,
const cairo_half_open_span_t *spans,
unsigned num_spans)
{
cairo_gl_span_renderer_t *r = abstract_renderer;
cairo_gl_emit_span_t emit = r->emit;
if (y > r->ymin) {
emit (r->ctx,
r->xmin, r->ymin,
r->xmax, y,
0);
}
if (num_spans == 0) {
emit (r->ctx,
r->xmin, y,
r->xmax, y + height,
0);
} else {
if (spans[0].x != r->xmin) {
emit (r->ctx,
r->xmin, y,
spans[0].x, y + height,
0);
}
do {
emit (r->ctx,
spans[0].x, y,
spans[1].x, y + height,
r->opacity * spans[0].coverage);
spans++;
} while (--num_spans > 1);
if (spans[0].x != r->xmax) {
emit (r->ctx,
spans[0].x, y,
r->xmax, y + height,
0);
}
}
r->ymin = y + height;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_finish_unbounded_spans (void *abstract_renderer)
{
cairo_gl_span_renderer_t *r = abstract_renderer;
cairo_gl_emit_span_t emit = r->emit;
if (r->ymax > r->ymin) {
emit (r->ctx,
r->xmin, r->ymin,
r->xmax, r->ymax,
0);
}
return _cairo_gl_context_release (r->ctx, CAIRO_STATUS_SUCCESS);
}
static cairo_status_t
_cairo_gl_finish_bounded_spans (void *abstract_renderer)
{
cairo_gl_span_renderer_t *r = abstract_renderer;
return _cairo_gl_context_release (r->ctx, CAIRO_STATUS_SUCCESS);
}
static void
emit_aligned_boxes (cairo_gl_context_t *ctx,
const cairo_boxes_t *boxes)
{
const struct _cairo_boxes_chunk *chunk;
cairo_gl_emit_rect_t emit = _cairo_gl_context_choose_emit_rect (ctx);
int i;
TRACE ((stderr, "%s: num_boxes=%d\n", __FUNCTION__, boxes->num_boxes));
for (chunk = &boxes->chunks; chunk; chunk = chunk->next) {
for (i = 0; i < chunk->count; i++) {
int x1 = _cairo_fixed_integer_part (chunk->base[i].p1.x);
int y1 = _cairo_fixed_integer_part (chunk->base[i].p1.y);
int x2 = _cairo_fixed_integer_part (chunk->base[i].p2.x);
int y2 = _cairo_fixed_integer_part (chunk->base[i].p2.y);
emit (ctx, x1, y1, x2, y2);
}
}
}
static cairo_int_status_t
fill_boxes (void *_dst,
cairo_operator_t op,
const cairo_color_t *color,
cairo_boxes_t *boxes)
{
cairo_gl_composite_t setup;
cairo_gl_context_t *ctx;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
status = _cairo_gl_composite_init (&setup, op, _dst, FALSE);
if (unlikely (status))
goto FAIL;
_cairo_gl_composite_set_solid_source (&setup, color);
status = _cairo_gl_composite_begin (&setup, &ctx);
if (unlikely (status))
goto FAIL;
emit_aligned_boxes (ctx, boxes);
status = _cairo_gl_context_release (ctx, CAIRO_STATUS_SUCCESS);
FAIL:
_cairo_gl_composite_fini (&setup);
return status;
}
static cairo_int_status_t
draw_image_boxes (void *_dst,
cairo_image_surface_t *image,
cairo_boxes_t *boxes,
int dx, int dy)
{
cairo_gl_surface_t *dst = _dst;
struct _cairo_boxes_chunk *chunk;
int i;
for (chunk = &boxes->chunks; chunk; chunk = chunk->next) {
for (i = 0; i < chunk->count; i++) {
cairo_box_t *b = &chunk->base[i];
int x = _cairo_fixed_integer_part (b->p1.x);
int y = _cairo_fixed_integer_part (b->p1.y);
int w = _cairo_fixed_integer_part (b->p2.x) - x;
int h = _cairo_fixed_integer_part (b->p2.y) - y;
cairo_status_t status;
status = _cairo_gl_surface_draw_image (dst, image,
x + dx, y + dy,
w, h,
x, y, TRUE);
if (unlikely (status))
return status;
}
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t copy_boxes (void *_dst,
cairo_surface_t *_src,
cairo_boxes_t *boxes,
const cairo_rectangle_int_t *extents,
int dx, int dy)
{
cairo_gl_surface_t *dst = _dst;
cairo_gl_surface_t *src = (cairo_gl_surface_t *)_src;
cairo_gl_composite_t setup;
cairo_gl_context_t *ctx;
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
if (! _cairo_gl_surface_is_texture (src))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (src->base.device != dst->base.device)
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_gl_composite_init (&setup, CAIRO_OPERATOR_SOURCE, _dst, FALSE);
if (unlikely (status))
goto FAIL;
_cairo_gl_composite_set_source_operand (&setup, &src->operand);
_cairo_gl_operand_translate (&setup.src, -dx, -dy);
status = _cairo_gl_composite_begin (&setup, &ctx);
if (unlikely (status))
goto FAIL;
emit_aligned_boxes (ctx, boxes);
status = _cairo_gl_context_release (ctx, CAIRO_STATUS_SUCCESS);
FAIL:
_cairo_gl_composite_fini (&setup);
return status;
}
static cairo_int_status_t
composite_boxes (void *_dst,
cairo_operator_t op,
cairo_surface_t *abstract_src,
cairo_surface_t *abstract_mask,
int src_x,
int src_y,
int mask_x,
int mask_y,
int dst_x,
int dst_y,
cairo_boxes_t *boxes,
const cairo_rectangle_int_t *extents)
{
cairo_gl_composite_t setup;
cairo_gl_context_t *ctx;
cairo_int_status_t status;
cairo_gl_operand_t tmp_operand;
cairo_gl_operand_t *src_operand;
TRACE ((stderr, "%s mask=(%d,%d), dst=(%d, %d)\n", __FUNCTION__,
mask_x, mask_y, dst_x, dst_y));
if (abstract_mask) {
if (op == CAIRO_OPERATOR_CLEAR) {
_cairo_gl_solid_operand_init (&tmp_operand, CAIRO_COLOR_WHITE);
src_operand = &tmp_operand;
op = CAIRO_OPERATOR_DEST_OUT;
} else if (op == CAIRO_OPERATOR_SOURCE) {
/* requires a LERP in the shader between dest and source */
return CAIRO_INT_STATUS_UNSUPPORTED;
} else
src_operand = source_to_operand (abstract_src);
} else
src_operand = source_to_operand (abstract_src);
status = _cairo_gl_composite_init (&setup, op, _dst, FALSE);
if (unlikely (status))
goto FAIL;
_cairo_gl_composite_set_source_operand (&setup,
src_operand);
_cairo_gl_operand_translate (&setup.src, -src_x, -src_y);
_cairo_gl_composite_set_mask_operand (&setup,
source_to_operand (abstract_mask));
_cairo_gl_operand_translate (&setup.mask, -mask_x, -mask_y);
status = _cairo_gl_composite_begin (&setup, &ctx);
if (unlikely (status))
goto FAIL;
emit_aligned_boxes (ctx, boxes);
status = _cairo_gl_context_release (ctx, CAIRO_STATUS_SUCCESS);
FAIL:
_cairo_gl_composite_fini (&setup);
if (src_operand == &tmp_operand)
_cairo_gl_operand_destroy (&tmp_operand);
return status;
}
static cairo_int_status_t
_cairo_gl_span_renderer_init (cairo_abstract_span_renderer_t *_r,
const cairo_composite_rectangles_t *composite,
cairo_antialias_t antialias,
cairo_bool_t needs_clip)
{
cairo_gl_span_renderer_t *r = (cairo_gl_span_renderer_t *)_r;
const cairo_pattern_t *source = &composite->source_pattern.base;
cairo_operator_t op = composite->op;
cairo_int_status_t status;
if (op == CAIRO_OPERATOR_SOURCE) {
if (! _cairo_pattern_is_opaque (&composite->source_pattern.base,
&composite->source_sample_area))
return CAIRO_INT_STATUS_UNSUPPORTED;
op = CAIRO_OPERATOR_OVER;
}
/* XXX earlier! */
if (op == CAIRO_OPERATOR_CLEAR) {
source = &_cairo_pattern_white.base;
op = CAIRO_OPERATOR_DEST_OUT;
} else if (composite->surface->is_clear &&
(op == CAIRO_OPERATOR_SOURCE ||
op == CAIRO_OPERATOR_OVER ||
op == CAIRO_OPERATOR_ADD)) {
op = CAIRO_OPERATOR_SOURCE;
} else if (op == CAIRO_OPERATOR_SOURCE) {
/* no lerp equivalent without some major PITA */
return CAIRO_INT_STATUS_UNSUPPORTED;
} else if (! _cairo_gl_operator_is_supported (op))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_gl_composite_init (&r->setup,
op, (cairo_gl_surface_t *)composite->surface,
FALSE);
if (unlikely (status))
goto FAIL;
status = _cairo_gl_composite_set_source (&r->setup, source,
&composite->source_sample_area,
&composite->unbounded,
TRUE);
if (unlikely (status))
goto FAIL;
r->opacity = 1.0;
if (composite->mask_pattern.base.type == CAIRO_PATTERN_TYPE_SOLID) {
r->opacity = composite->mask_pattern.solid.color.alpha;
} else {
status = _cairo_gl_composite_set_mask (&r->setup,
&composite->mask_pattern.base,
&composite->mask_sample_area,
&composite->unbounded,
TRUE);
if (unlikely (status))
goto FAIL;
}
_cairo_gl_composite_set_spans (&r->setup);
status = _cairo_gl_composite_begin (&r->setup, &r->ctx);
if (unlikely (status))
goto FAIL;
r->emit = _cairo_gl_context_choose_emit_span (r->ctx);
if (composite->is_bounded) {
if (r->opacity == 1.)
r->base.render_rows = _cairo_gl_bounded_opaque_spans;
else
r->base.render_rows = _cairo_gl_bounded_spans;
r->base.finish = _cairo_gl_finish_bounded_spans;
} else {
if (needs_clip)
r->base.render_rows = _cairo_gl_clipped_spans;
else
r->base.render_rows = _cairo_gl_unbounded_spans;
r->base.finish = _cairo_gl_finish_unbounded_spans;
r->xmin = composite->unbounded.x;
r->xmax = composite->unbounded.x + composite->unbounded.width;
r->ymin = composite->unbounded.y;
r->ymax = composite->unbounded.y + composite->unbounded.height;
}
return CAIRO_STATUS_SUCCESS;
FAIL:
return status;
}
static void
_cairo_gl_span_renderer_fini (cairo_abstract_span_renderer_t *_r,
cairo_int_status_t status)
{
cairo_gl_span_renderer_t *r = (cairo_gl_span_renderer_t *) _r;
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
return;
if (status == CAIRO_INT_STATUS_SUCCESS)
r->base.finish (r);
_cairo_gl_composite_fini (&r->setup);
}
const cairo_compositor_t *
_cairo_gl_span_compositor_get (void)
{
static cairo_spans_compositor_t spans;
static cairo_compositor_t shape;
if (spans.base.delegate == NULL) {
/* The fallback to traps here is essentially just for glyphs... */
_cairo_shape_mask_compositor_init (&shape,
_cairo_gl_traps_compositor_get());
shape.glyphs = NULL;
_cairo_spans_compositor_init (&spans, &shape);
spans.fill_boxes = fill_boxes;
spans.draw_image_boxes = draw_image_boxes;
spans.copy_boxes = copy_boxes;
//spans.check_composite_boxes = check_composite_boxes;
spans.pattern_to_surface = _cairo_gl_pattern_to_source;
spans.composite_boxes = composite_boxes;
//spans.check_span_renderer = check_span_renderer;
spans.renderer_init = _cairo_gl_span_renderer_init;
spans.renderer_fini = _cairo_gl_span_renderer_fini;
}
return &spans.base;
}