clip: Rudimentary support for clip-polygon extraction

Step 1, fix the failings sighted recently by tracking clip-boxes as an
explicit property of the clipping and of composition.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 601 insertions, 0 deletions

diff --git a/src/cairo-gl-surface-legacy.c b/src/cairo-gl-surface-legacy.c
new file mode 100644
index 00000000..0ba356e1
--- /dev/null
+++ b/src/cairo-gl-surface-legacy.c
@@ -0,0 +1,601 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2009 Eric Anholt
+ * Copyright © 2009 Chris Wilson
+ * Copyright © 2005,2010 Red Hat, Inc
+ *
+ * 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-composite-rectangles-private.h"
+#include "cairo-default-context-private.h"
+#include "cairo-error-private.h"
+#include "cairo-gl-private.h"
+
+cairo_status_t
+_cairo_gl_surface_acquire_dest_image (void		      *abstract_surface,
+				      cairo_rectangle_int_t   *interest_rect,
+				      cairo_image_surface_t  **image_out,
+				      cairo_rectangle_int_t   *image_rect_out,
+				      void		     **image_extra)
+{
+    cairo_gl_surface_t *surface = abstract_surface;
+    cairo_int_status_t status;
+
+    status = _cairo_gl_surface_deferred_clear (surface);
+    if (unlikely (status))
+	return status;
+
+    *image_extra = NULL;
+    return _cairo_gl_surface_get_image (surface, interest_rect, image_out,
+					image_rect_out);
+}
+
+void
+_cairo_gl_surface_release_dest_image (void		      *abstract_surface,
+				      cairo_rectangle_int_t   *interest_rect,
+				      cairo_image_surface_t   *image,
+				      cairo_rectangle_int_t   *image_rect,
+				      void		      *image_extra)
+{
+    cairo_status_t status;
+
+    status = _cairo_gl_surface_draw_image (abstract_surface, image,
+					   0, 0,
+					   image->width, image->height,
+					   image_rect->x, image_rect->y);
+    /* as we created the image, its format should be directly applicable */
+    assert (status == CAIRO_STATUS_SUCCESS);
+
+    cairo_surface_destroy (&image->base);
+}
+
+cairo_status_t
+_cairo_gl_surface_clone_similar (void		     *abstract_surface,
+				 cairo_surface_t     *src,
+				 int                  src_x,
+				 int                  src_y,
+				 int                  width,
+				 int                  height,
+				 int                 *clone_offset_x,
+				 int                 *clone_offset_y,
+				 cairo_surface_t    **clone_out)
+{
+    cairo_gl_surface_t *surface = abstract_surface;
+    cairo_int_status_t status;
+
+    /* XXX: Use GLCopyTexImage2D to clone non-texture-surfaces */
+    if (src->device == surface->base.device &&
+        _cairo_gl_surface_is_texture ((cairo_gl_surface_t *) src)) {
+	status = _cairo_gl_surface_deferred_clear ((cairo_gl_surface_t *)src);
+	if (unlikely (status))
+	    return status;
+
+	*clone_offset_x = 0;
+	*clone_offset_y = 0;
+	*clone_out = cairo_surface_reference (src);
+
+	return CAIRO_STATUS_SUCCESS;
+    } else if (_cairo_surface_is_image (src)) {
+	cairo_image_surface_t *image_src = (cairo_image_surface_t *)src;
+	cairo_gl_surface_t *clone;
+
+	clone = (cairo_gl_surface_t *)
+		_cairo_gl_surface_create_similar (&surface->base,
+						  src->content,
+						  width, height);
+	if (clone == NULL)
+	    return UNSUPPORTED ("create_similar failed");
+	if (clone->base.status)
+	    return clone->base.status;
+
+	status = _cairo_gl_surface_draw_image (clone, image_src,
+					       src_x, src_y,
+					       width, height,
+					       0, 0);
+	if (status) {
+	    cairo_surface_destroy (&clone->base);
+	    return status;
+	}
+
+	*clone_out = &clone->base;
+	*clone_offset_x = src_x;
+	*clone_offset_y = src_y;
+
+	return CAIRO_STATUS_SUCCESS;
+    }
+
+    return UNSUPPORTED ("unknown src surface type in clone_similar");
+}
+
+/** Creates a cairo-gl pattern surface for the given trapezoids */
+static cairo_status_t
+_cairo_gl_get_traps_pattern (cairo_gl_surface_t *dst,
+			     int dst_x, int dst_y,
+			     int width, int height,
+			     cairo_trapezoid_t *traps,
+			     int num_traps,
+			     cairo_antialias_t antialias,
+			     cairo_surface_pattern_t *pattern)
+{
+    pixman_format_code_t pixman_format;
+    pixman_image_t *image;
+    cairo_surface_t *surface;
+    int i;
+
+    pixman_format = antialias != CAIRO_ANTIALIAS_NONE ? PIXMAN_a8 : PIXMAN_a1,
+    image = pixman_image_create_bits (pixman_format, width, height, NULL, 0);
+    if (unlikely (image == NULL))
+	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+
+    for (i = 0; i < num_traps; i++) {
+	pixman_trapezoid_t trap;
+
+	trap.top = _cairo_fixed_to_16_16 (traps[i].top);
+	trap.bottom = _cairo_fixed_to_16_16 (traps[i].bottom);
+
+	trap.left.p1.x = _cairo_fixed_to_16_16 (traps[i].left.p1.x);
+	trap.left.p1.y = _cairo_fixed_to_16_16 (traps[i].left.p1.y);
+	trap.left.p2.x = _cairo_fixed_to_16_16 (traps[i].left.p2.x);
+	trap.left.p2.y = _cairo_fixed_to_16_16 (traps[i].left.p2.y);
+
+	trap.right.p1.x = _cairo_fixed_to_16_16 (traps[i].right.p1.x);
+	trap.right.p1.y = _cairo_fixed_to_16_16 (traps[i].right.p1.y);
+	trap.right.p2.x = _cairo_fixed_to_16_16 (traps[i].right.p2.x);
+	trap.right.p2.y = _cairo_fixed_to_16_16 (traps[i].right.p2.y);
+
+	pixman_rasterize_trapezoid (image, &trap, -dst_x, -dst_y);
+    }
+
+    surface = _cairo_image_surface_create_for_pixman_image (image,
+							    pixman_format);
+    if (unlikely (surface->status)) {
+	pixman_image_unref (image);
+	return surface->status;
+    }
+
+    _cairo_pattern_init_for_surface (pattern, surface);
+    cairo_surface_destroy (surface);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_int_status_t
+_cairo_gl_surface_composite (cairo_operator_t		  op,
+			     const cairo_pattern_t	 *src,
+			     const cairo_pattern_t	 *mask,
+			     void			 *abstract_dst,
+			     int			  src_x,
+			     int			  src_y,
+			     int			  mask_x,
+			     int			  mask_y,
+			     int			  dst_x,
+			     int			  dst_y,
+			     unsigned int		  width,
+			     unsigned int		  height,
+			     cairo_region_t		 *clip_region)
+{
+    cairo_gl_surface_t *dst = abstract_dst;
+    cairo_gl_context_t *ctx;
+    cairo_status_t status;
+    cairo_gl_composite_t setup;
+    cairo_rectangle_int_t rect = { dst_x, dst_y, width, height };
+    int dx, dy;
+
+    status = _cairo_gl_surface_deferred_clear (dst);
+    if (unlikely (status))
+	    return status;
+
+    if (op == CAIRO_OPERATOR_SOURCE &&
+        mask == NULL &&
+        src->type == CAIRO_PATTERN_TYPE_SURFACE &&
+        _cairo_surface_is_image (((cairo_surface_pattern_t *) src)->surface) &&
+        _cairo_matrix_is_integer_translation (&src->matrix, &dx, &dy)) {
+        cairo_image_surface_t *image = (cairo_image_surface_t *)
+            ((cairo_surface_pattern_t *) src)->surface;
+        dx += src_x;
+        dy += src_y;
+        if (dx >= 0 &&
+            dy >= 0 &&
+            dx + width <= (unsigned int) image->width &&
+            dy + height <= (unsigned int) image->height) {
+            status = _cairo_gl_surface_draw_image (dst, image,
+                                                   dx, dy,
+                                                   width, height,
+                                                   dst_x, dst_y);
+            if (status != CAIRO_INT_STATUS_UNSUPPORTED)
+                return status;
+        }
+    }
+
+    status = _cairo_gl_composite_init (&setup, op, dst,
+                                       mask && mask->has_component_alpha,
+                                       &rect);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    status = _cairo_gl_composite_set_source (&setup, src,
+                                             src_x, src_y,
+                                             dst_x, dst_y,
+                                             width, height);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    status = _cairo_gl_composite_set_mask (&setup, mask,
+                                           mask_x, mask_y,
+                                           dst_x, dst_y,
+                                           width, height);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    status = _cairo_gl_composite_begin (&setup, &ctx);
+    if (unlikely (status))
+	goto CLEANUP;
+
+    if (clip_region != NULL) {
+        int i, num_rectangles;
+
+        num_rectangles = cairo_region_num_rectangles (clip_region);
+
+	for (i = 0; i < num_rectangles; i++) {
+	    cairo_rectangle_int_t rect;
+
+	    cairo_region_get_rectangle (clip_region, i, &rect);
+            _cairo_gl_composite_emit_rect (ctx,
+                                           rect.x,              rect.y,
+                                           rect.x + rect.width, rect.y + rect.height,
+                                           0);
+	}
+    } else {
+        _cairo_gl_composite_emit_rect (ctx,
+                                       dst_x,         dst_y,
+                                       dst_x + width, dst_y + height,
+                                       0);
+    }
+
+    status = _cairo_gl_context_release (ctx, status);
+
+  CLEANUP:
+    _cairo_gl_composite_fini (&setup);
+
+    return status;
+}
+
+cairo_int_status_t
+_cairo_gl_surface_composite_trapezoids (cairo_operator_t op,
+					const cairo_pattern_t *pattern,
+					void *abstract_dst,
+					cairo_antialias_t antialias,
+					int src_x, int src_y,
+					int dst_x, int dst_y,
+					unsigned int width,
+					unsigned int height,
+					cairo_trapezoid_t *traps,
+					int num_traps,
+					cairo_region_t *clip_region)
+{
+    cairo_gl_surface_t *dst = abstract_dst;
+    cairo_surface_pattern_t traps_pattern;
+    cairo_int_status_t status;
+
+    if (! _cairo_gl_operator_is_supported (op))
+	return UNSUPPORTED ("unsupported operator");
+
+    status = _cairo_gl_surface_deferred_clear (dst);
+    if (unlikely (status))
+	    return status;
+
+    status = _cairo_gl_get_traps_pattern (dst,
+					  dst_x, dst_y, width, height,
+					  traps, num_traps, antialias,
+					  &traps_pattern);
+    if (unlikely (status))
+	return status;
+
+    status = _cairo_gl_surface_composite (op,
+					  pattern, &traps_pattern.base, dst,
+					  src_x, src_y,
+					  0, 0,
+					  dst_x, dst_y,
+					  width, height,
+					  clip_region);
+
+    _cairo_pattern_fini (&traps_pattern.base);
+
+    assert (status != CAIRO_INT_STATUS_UNSUPPORTED);
+    return status;
+}
+
+cairo_int_status_t
+_cairo_gl_surface_fill_rectangles (void			   *abstract_dst,
+				   cairo_operator_t	    op,
+				   const cairo_color_t     *color,
+				   cairo_rectangle_int_t   *rects,
+				   int			    num_rects)
+{
+    cairo_gl_surface_t *dst = abstract_dst;
+    cairo_solid_pattern_t solid;
+    cairo_gl_context_t *ctx;
+    cairo_status_t status;
+    cairo_gl_composite_t setup;
+    int i;
+
+    status = _cairo_gl_surface_deferred_clear (dst);
+    if (unlikely (status))
+	    return status;
+
+    status = _cairo_gl_composite_init (&setup, op, dst,
+                                       FALSE,
+                                       /* XXX */ NULL);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    _cairo_pattern_init_solid (&solid, color);
+    status = _cairo_gl_composite_set_source (&setup, &solid.base,
+                                             0, 0,
+                                             0, 0,
+                                             0, 0);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    status = _cairo_gl_composite_set_mask (&setup, NULL,
+                                           0, 0,
+                                           0, 0,
+                                           0, 0);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    status = _cairo_gl_composite_begin (&setup, &ctx);
+    if (unlikely (status))
+        goto CLEANUP;
+
+    for (i = 0; i < num_rects; i++) {
+        _cairo_gl_composite_emit_rect (ctx,
+                                       rects[i].x,
+                                       rects[i].y,
+                                       rects[i].x + rects[i].width,
+                                       rects[i].y + rects[i].height,
+                                       0);
+    }
+
+    status = _cairo_gl_context_release (ctx, status);
+
+  CLEANUP:
+    _cairo_gl_composite_fini (&setup);
+
+    return status;
+}
+
+typedef struct _cairo_gl_surface_span_renderer {
+    cairo_span_renderer_t base;
+
+    cairo_gl_composite_t setup;
+
+    int xmin, xmax;
+    int ymin, ymax;
+
+    cairo_gl_context_t *ctx;
+} cairo_gl_surface_span_renderer_t;
+
+static cairo_status_t
+_cairo_gl_render_bounded_spans (void *abstract_renderer,
+				int y, int height,
+				const cairo_half_open_span_t *spans,
+				unsigned num_spans)
+{
+    cairo_gl_surface_span_renderer_t *renderer = abstract_renderer;
+
+    if (num_spans == 0)
+	return CAIRO_STATUS_SUCCESS;
+
+    do {
+	if (spans[0].coverage) {
+            _cairo_gl_composite_emit_rect (renderer->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_render_unbounded_spans (void *abstract_renderer,
+				  int y, int height,
+				  const cairo_half_open_span_t *spans,
+				  unsigned num_spans)
+{
+    cairo_gl_surface_span_renderer_t *renderer = abstract_renderer;
+
+    if (y > renderer->ymin) {
+        _cairo_gl_composite_emit_rect (renderer->ctx,
+                                       renderer->xmin, renderer->ymin,
+                                       renderer->xmax, y,
+                                       0);
+    }
+
+    if (num_spans == 0) {
+        _cairo_gl_composite_emit_rect (renderer->ctx,
+                                       renderer->xmin, y,
+                                       renderer->xmax, y + height,
+                                       0);
+    } else {
+        if (spans[0].x != renderer->xmin) {
+            _cairo_gl_composite_emit_rect (renderer->ctx,
+                                           renderer->xmin, y,
+                                           spans[0].x,     y + height,
+                                           0);
+        }
+
+        do {
+            _cairo_gl_composite_emit_rect (renderer->ctx,
+                                           spans[0].x, y,
+                                           spans[1].x, y + height,
+                                           spans[0].coverage);
+            spans++;
+        } while (--num_spans > 1);
+
+        if (spans[0].x != renderer->xmax) {
+            _cairo_gl_composite_emit_rect (renderer->ctx,
+                                           spans[0].x,     y,
+                                           renderer->xmax, y + height,
+                                           0);
+        }
+    }
+
+    renderer->ymin = y + height;
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+_cairo_gl_finish_unbounded_spans (void *abstract_renderer)
+{
+    cairo_gl_surface_span_renderer_t *renderer = abstract_renderer;
+
+    if (renderer->ymax > renderer->ymin) {
+        _cairo_gl_composite_emit_rect (renderer->ctx,
+                                       renderer->xmin, renderer->ymin,
+                                       renderer->xmax, renderer->ymax,
+                                       0);
+    }
+
+    return _cairo_gl_context_release (renderer->ctx, CAIRO_STATUS_SUCCESS);
+}
+
+static cairo_status_t
+_cairo_gl_finish_bounded_spans (void *abstract_renderer)
+{
+    cairo_gl_surface_span_renderer_t *renderer = abstract_renderer;
+
+    return _cairo_gl_context_release (renderer->ctx, CAIRO_STATUS_SUCCESS);
+}
+
+static void
+_cairo_gl_surface_span_renderer_destroy (void *abstract_renderer)
+{
+    cairo_gl_surface_span_renderer_t *renderer = abstract_renderer;
+
+    if (!renderer)
+	return;
+
+    _cairo_gl_composite_fini (&renderer->setup);
+
+    free (renderer);
+}
+
+cairo_bool_t
+_cairo_gl_surface_check_span_renderer (cairo_operator_t	       op,
+				       const cairo_pattern_t  *pattern,
+				       void		      *abstract_dst,
+				       cairo_antialias_t       antialias)
+{
+    if (! _cairo_gl_operator_is_supported (op))
+	return FALSE;
+
+    return TRUE;
+
+    (void) pattern;
+    (void) abstract_dst;
+    (void) antialias;
+}
+
+cairo_span_renderer_t *
+_cairo_gl_surface_create_span_renderer (cairo_operator_t	 op,
+					const cairo_pattern_t	*src,
+					void			*abstract_dst,
+					cairo_antialias_t	 antialias,
+					const cairo_composite_rectangles_t *rects)
+{
+    cairo_gl_surface_t *dst = abstract_dst;
+    cairo_gl_surface_span_renderer_t *renderer;
+    cairo_status_t status;
+    const cairo_rectangle_int_t *extents;
+
+    status = _cairo_gl_surface_deferred_clear (dst);
+    if (unlikely (status))
+	return _cairo_span_renderer_create_in_error (status);
+
+    renderer = calloc (1, sizeof (*renderer));
+    if (unlikely (renderer == NULL))
+	return _cairo_span_renderer_create_in_error (CAIRO_STATUS_NO_MEMORY);
+
+    renderer->base.destroy = _cairo_gl_surface_span_renderer_destroy;
+    if (rects->is_bounded) {
+	renderer->base.render_rows = _cairo_gl_render_bounded_spans;
+        renderer->base.finish =      _cairo_gl_finish_bounded_spans;
+	extents = &rects->bounded;
+    } else {
+	renderer->base.render_rows = _cairo_gl_render_unbounded_spans;
+        renderer->base.finish =      _cairo_gl_finish_unbounded_spans;
+	extents = &rects->unbounded;
+    }
+    renderer->xmin = extents->x;
+    renderer->xmax = extents->x + extents->width;
+    renderer->ymin = extents->y;
+    renderer->ymax = extents->y + extents->height;
+
+    status = _cairo_gl_composite_init (&renderer->setup,
+                                       op, dst,
+                                       FALSE, extents);
+    if (unlikely (status))
+        goto FAIL;
+
+    status = _cairo_gl_composite_set_source (&renderer->setup, src,
+                                             extents->x, extents->y,
+                                             extents->x, extents->y,
+                                             extents->width, extents->height);
+    if (unlikely (status))
+        goto FAIL;
+
+    _cairo_gl_composite_set_spans (&renderer->setup);
+    _cairo_gl_composite_set_clip_region (&renderer->setup,
+					 _cairo_clip_get_region (rects->clip));
+
+    status = _cairo_gl_composite_begin (&renderer->setup, &renderer->ctx);
+    if (unlikely (status))
+        goto FAIL;
+
+    return &renderer->base;
+
+FAIL:
+    _cairo_gl_composite_fini (&renderer->setup);
+    free (renderer);
+    return _cairo_span_renderer_create_in_error (status);
+}
+