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ffd2cf8ef8
As part of an on-going effort to enable non-opengl drivers for Cogl this splits out the opengl specific code in cogl-clip-stack.c into cogl/driver/cogl-clip-stack-gl.c Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit acf989f1bb628282c53d1249b2e3fc6f6579f1e9)
465 lines
14 KiB
C
465 lines
14 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <math.h>
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#include <glib.h>
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#include "cogl-clip-stack.h"
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#include "cogl-primitives.h"
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#include "cogl-context-private.h"
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#include "cogl-internal.h"
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#include "cogl-framebuffer-private.h"
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#include "cogl-journal-private.h"
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#include "cogl-util.h"
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#include "cogl-path-private.h"
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#include "cogl-matrix-private.h"
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#include "cogl-primitives-private.h"
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#include "cogl-private.h"
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#include "cogl-pipeline-opengl-private.h"
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#include "cogl-attribute-private.h"
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#include "cogl-primitive-private.h"
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#include "cogl1-context.h"
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#include "cogl-offscreen.h"
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#include "cogl-matrix-stack.h"
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static void *
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_cogl_clip_stack_push_entry (CoglClipStack *clip_stack,
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size_t size,
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CoglClipStackType type)
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{
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CoglClipStack *entry = g_slice_alloc (size);
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/* The new entry starts with a ref count of 1 because the stack
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holds a reference to it as it is the top entry */
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entry->ref_count = 1;
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entry->type = type;
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entry->parent = clip_stack;
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/* We don't need to take a reference to the parent from the entry
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because the we are stealing the ref in the new stack top */
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return entry;
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}
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static void
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get_transformed_corners (float x_1,
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float y_1,
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float x_2,
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float y_2,
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CoglMatrix *modelview,
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CoglMatrix *projection,
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const float *viewport,
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float *transformed_corners)
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{
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int i;
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transformed_corners[0] = x_1;
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transformed_corners[1] = y_1;
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transformed_corners[2] = x_2;
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transformed_corners[3] = y_1;
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transformed_corners[4] = x_2;
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transformed_corners[5] = y_2;
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transformed_corners[6] = x_1;
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transformed_corners[7] = y_2;
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/* Project the coordinates to window space coordinates */
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for (i = 0; i < 4; i++)
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{
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float *v = transformed_corners + i * 2;
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_cogl_transform_point (modelview, projection, viewport, v, v + 1);
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}
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}
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/* Sets the window-space bounds of the entry based on the projected
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coordinates of the given rectangle */
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static void
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_cogl_clip_stack_entry_set_bounds (CoglClipStack *entry,
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float *transformed_corners)
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{
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float min_x = G_MAXFLOAT, min_y = G_MAXFLOAT;
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float max_x = -G_MAXFLOAT, max_y = -G_MAXFLOAT;
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int i;
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for (i = 0; i < 4; i++)
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{
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float *v = transformed_corners + i * 2;
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if (v[0] > max_x)
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max_x = v[0];
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if (v[0] < min_x)
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min_x = v[0];
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if (v[1] > max_y)
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max_y = v[1];
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if (v[1] < min_y)
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min_y = v[1];
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}
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entry->bounds_x0 = floorf (min_x);
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entry->bounds_x1 = ceilf (max_x);
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entry->bounds_y0 = floorf (min_y);
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entry->bounds_y1 = ceilf (max_y);
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}
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CoglClipStack *
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_cogl_clip_stack_push_window_rectangle (CoglClipStack *stack,
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int x_offset,
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int y_offset,
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int width,
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int height)
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{
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CoglClipStack *entry;
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entry = _cogl_clip_stack_push_entry (stack,
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sizeof (CoglClipStackWindowRect),
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COGL_CLIP_STACK_WINDOW_RECT);
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entry->bounds_x0 = x_offset;
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entry->bounds_x1 = x_offset + width;
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entry->bounds_y0 = y_offset;
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entry->bounds_y1 = y_offset + height;
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return entry;
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}
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CoglClipStack *
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_cogl_clip_stack_push_rectangle (CoglClipStack *stack,
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float x_1,
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float y_1,
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float x_2,
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float y_2,
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CoglMatrixEntry *modelview_entry,
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CoglMatrixEntry *projection_entry,
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const float *viewport)
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{
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CoglClipStackRect *entry;
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CoglMatrix modelview;
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CoglMatrix projection;
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CoglMatrix modelview_projection;
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/* Corners of the given rectangle in an clockwise order:
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* (0, 1) (2, 3)
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*
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*
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*
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* (6, 7) (4, 5)
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*/
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float rect[] = {
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x_1, y_1,
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x_2, y_1,
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x_2, y_2,
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x_1, y_2
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};
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/* Make a new entry */
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entry = _cogl_clip_stack_push_entry (stack,
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sizeof (CoglClipStackRect),
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COGL_CLIP_STACK_RECT);
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entry->x0 = x_1;
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entry->y0 = y_1;
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entry->x1 = x_2;
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entry->y1 = y_2;
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entry->matrix_entry = _cogl_matrix_entry_ref (modelview_entry);
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_cogl_matrix_entry_get (modelview_entry, &modelview);
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_cogl_matrix_entry_get (projection_entry, &projection);
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cogl_matrix_multiply (&modelview_projection,
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&projection,
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&modelview);
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/* Technically we could avoid the viewport transform at this point
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* if we want to make this a bit faster. */
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_cogl_transform_point (&modelview, &projection, viewport, &rect[0], &rect[1]);
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_cogl_transform_point (&modelview, &projection, viewport, &rect[2], &rect[3]);
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_cogl_transform_point (&modelview, &projection, viewport, &rect[4], &rect[5]);
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_cogl_transform_point (&modelview, &projection, viewport, &rect[6], &rect[7]);
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/* If the fully transformed rectangle isn't still axis aligned we
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* can't handle it using a scissor.
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*
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* We don't use an epsilon here since we only really aim to catch
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* simple cases where the transform doesn't leave the rectangle screen
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* aligned and don't mind some false positives.
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*/
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if (rect[0] != rect[6] ||
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rect[1] != rect[3] ||
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rect[2] != rect[4] ||
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rect[7] != rect[5])
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{
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entry->can_be_scissor = FALSE;
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_cogl_clip_stack_entry_set_bounds ((CoglClipStack *) entry,
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rect);
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}
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else
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{
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CoglClipStack *base_entry = (CoglClipStack *) entry;
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x_1 = rect[0];
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y_1 = rect[1];
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x_2 = rect[4];
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y_2 = rect[5];
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/* Consider that the modelview matrix may flip the rectangle
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* along the x or y axis... */
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#define SWAP(A,B) do { float tmp = B; B = A; A = tmp; } while (0)
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if (x_1 > x_2)
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SWAP (x_1, x_2);
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if (y_1 > y_2)
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SWAP (y_1, y_2);
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#undef SWAP
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base_entry->bounds_x0 = COGL_UTIL_NEARBYINT (x_1);
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base_entry->bounds_y0 = COGL_UTIL_NEARBYINT (y_1);
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base_entry->bounds_x1 = COGL_UTIL_NEARBYINT (x_2);
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base_entry->bounds_y1 = COGL_UTIL_NEARBYINT (y_2);
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entry->can_be_scissor = TRUE;
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}
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return (CoglClipStack *) entry;
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}
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CoglClipStack *
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_cogl_clip_stack_push_from_path (CoglClipStack *stack,
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CoglPath *path,
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CoglMatrixEntry *modelview_entry,
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CoglMatrixEntry *projection_entry,
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const float *viewport)
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{
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float x_1, y_1, x_2, y_2;
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_cogl_path_get_bounds (path, &x_1, &y_1, &x_2, &y_2);
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/* If the path is a simple rectangle then we can divert to pushing a
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rectangle clip instead which usually won't involve the stencil
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buffer */
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if (_cogl_path_is_rectangle (path))
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return _cogl_clip_stack_push_rectangle (stack,
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x_1, y_1,
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x_2, y_2,
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modelview_entry,
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projection_entry,
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viewport);
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else
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{
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CoglClipStackPath *entry;
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CoglMatrix modelview;
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CoglMatrix projection;
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float transformed_corners[8];
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entry = _cogl_clip_stack_push_entry (stack,
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sizeof (CoglClipStackPath),
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COGL_CLIP_STACK_PATH);
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entry->path = cogl_path_copy (path);
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entry->matrix_entry = _cogl_matrix_entry_ref (modelview_entry);
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_cogl_matrix_entry_get (modelview_entry, &modelview);
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_cogl_matrix_entry_get (projection_entry, &projection);
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get_transformed_corners (x_1, y_1, x_2, y_2,
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&modelview,
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&projection,
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viewport,
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transformed_corners);
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_cogl_clip_stack_entry_set_bounds ((CoglClipStack *) entry,
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transformed_corners);
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return (CoglClipStack *) entry;
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}
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}
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CoglClipStack *
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_cogl_clip_stack_push_primitive (CoglClipStack *stack,
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CoglPrimitive *primitive,
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float bounds_x1,
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float bounds_y1,
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float bounds_x2,
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float bounds_y2,
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CoglMatrixEntry *modelview_entry,
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CoglMatrixEntry *projection_entry,
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const float *viewport)
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{
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CoglClipStackPrimitive *entry;
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CoglMatrix modelview;
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CoglMatrix projection;
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float transformed_corners[8];
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entry = _cogl_clip_stack_push_entry (stack,
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sizeof (CoglClipStackPrimitive),
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COGL_CLIP_STACK_PRIMITIVE);
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entry->primitive = cogl_object_ref (primitive);
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entry->matrix_entry = _cogl_matrix_entry_ref (modelview_entry);
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entry->bounds_x1 = bounds_x1;
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entry->bounds_y1 = bounds_y1;
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entry->bounds_x2 = bounds_x2;
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entry->bounds_y2 = bounds_y2;
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_cogl_matrix_entry_get (modelview_entry, &modelview);
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_cogl_matrix_entry_get (modelview_entry, &projection);
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get_transformed_corners (bounds_x1, bounds_y1, bounds_x2, bounds_y2,
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&modelview,
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&projection,
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viewport,
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transformed_corners);
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/* NB: this is referring to the bounds in window coordinates as opposed
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* to the bounds above in primitive local coordinates. */
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_cogl_clip_stack_entry_set_bounds ((CoglClipStack *) entry,
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transformed_corners);
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return (CoglClipStack *) entry;
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}
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CoglClipStack *
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_cogl_clip_stack_ref (CoglClipStack *entry)
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{
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/* A NULL pointer is considered a valid stack so we should accept
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that as an argument */
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if (entry)
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entry->ref_count++;
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return entry;
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}
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void
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_cogl_clip_stack_unref (CoglClipStack *entry)
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{
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/* Unref all of the entries until we hit the root of the list or the
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entry still has a remaining reference */
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while (entry && --entry->ref_count <= 0)
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{
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CoglClipStack *parent = entry->parent;
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switch (entry->type)
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{
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case COGL_CLIP_STACK_RECT:
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{
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CoglClipStackRect *rect = (CoglClipStackRect *) entry;
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_cogl_matrix_entry_unref (rect->matrix_entry);
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g_slice_free1 (sizeof (CoglClipStackRect), entry);
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break;
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}
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case COGL_CLIP_STACK_WINDOW_RECT:
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g_slice_free1 (sizeof (CoglClipStackWindowRect), entry);
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break;
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case COGL_CLIP_STACK_PATH:
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{
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CoglClipStackPath *path_entry = (CoglClipStackPath *) entry;
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_cogl_matrix_entry_unref (path_entry->matrix_entry);
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cogl_object_unref (path_entry->path);
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g_slice_free1 (sizeof (CoglClipStackPath), entry);
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break;
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}
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case COGL_CLIP_STACK_PRIMITIVE:
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{
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CoglClipStackPrimitive *primitive_entry =
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(CoglClipStackPrimitive *) entry;
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_cogl_matrix_entry_unref (primitive_entry->matrix_entry);
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cogl_object_unref (primitive_entry->primitive);
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g_slice_free1 (sizeof (CoglClipStackPrimitive), entry);
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break;
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}
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default:
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g_assert_not_reached ();
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}
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entry = parent;
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}
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}
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CoglClipStack *
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_cogl_clip_stack_pop (CoglClipStack *stack)
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{
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CoglClipStack *new_top;
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_COGL_RETURN_VAL_IF_FAIL (stack != NULL, NULL);
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/* To pop we are moving the top of the stack to the old top's parent
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node. The stack always needs to have a reference to the top entry
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so we must take a reference to the new top. The stack would have
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previously had a reference to the old top so we need to decrease
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the ref count on that. We need to ref the new head first in case
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this stack was the only thing referencing the old top. In that
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case the call to _cogl_clip_stack_entry_unref will unref the
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parent. */
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new_top = stack->parent;
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_cogl_clip_stack_ref (new_top);
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_cogl_clip_stack_unref (stack);
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return new_top;
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}
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void
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_cogl_clip_stack_get_bounds (CoglClipStack *stack,
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int *scissor_x0,
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int *scissor_y0,
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int *scissor_x1,
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int *scissor_y1)
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{
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CoglClipStack *entry;
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*scissor_x0 = 0;
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*scissor_y0 = 0;
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*scissor_x1 = G_MAXINT;
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*scissor_y1 = G_MAXINT;
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for (entry = stack; entry; entry = entry->parent)
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{
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/* Get the intersection of the current scissor and the bounding
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box of this clip */
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*scissor_x0 = MAX (*scissor_x0, entry->bounds_x0);
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*scissor_y0 = MAX (*scissor_y0, entry->bounds_y0);
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*scissor_x1 = MIN (*scissor_x1, entry->bounds_x1);
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*scissor_y1 = MIN (*scissor_y1, entry->bounds_y1);
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}
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}
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void
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_cogl_clip_stack_flush (CoglClipStack *stack,
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CoglFramebuffer *framebuffer)
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{
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CoglContext *ctx = framebuffer->context;
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ctx->driver_vtable->clip_stack_flush (stack, framebuffer);
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}
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