278 lines
9.8 KiB
C
278 lines
9.8 KiB
C
/****************************************************************************
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* graphics/nxbe/nxbe_clipper.c
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <debug.h>
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#include <nuttx/nxglib.h>
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#include "nxbe.h"
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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#define NX_INITIAL_STACKSIZE (32)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure is a container that retains an associated between a
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* window instance and a rectangle.
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*/
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struct nxbe_cliprect_s
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{
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FAR struct nxbe_window_s *wnd;
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struct nxgl_rect_s rect;
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};
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/* This is the stack of pending clip operations */
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struct nxbe_clipstack_s
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{
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uint16 npushed; /* Number of deferred rectangles in stack */
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uint16 mxrects; /* The capacity of the stack */
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struct nxbe_cliprect_s *stack; /* The stack of deferred rectangles */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const ubyte g_nxcliporder[4][4] =
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{
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{ NX_TOP_NDX, NX_LEFT_NDX, NX_RIGHT_NDX, NX_BOTTOM_NDX }, /* index = NX_CLIPORDER_TLRB */
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{ NX_TOP_NDX, NX_RIGHT_NDX, NX_LEFT_NDX, NX_BOTTOM_NDX }, /* NX_CLIPORDER_TRLB */
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{ NX_BOTTOM_NDX, NX_LEFT_NDX, NX_RIGHT_NDX, NX_TOP_NDX }, /* NX_CLIPORDER_BLRT */
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{ NX_BOTTOM_NDX, NX_RIGHT_NDX, NX_LEFT_NDX, NX_TOP_NDX } /* NX_CLIPORDER_BRLT */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxbe_pushrectangle
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****************************************************************************/
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static inline void nxbe_pushrectangle(FAR struct nxbe_clipstack_s *stack,
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FAR struct nxbe_window_s *wnd,
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FAR const struct nxgl_rect_s *rect)
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{
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/* Check if there is room on the stack to hold another rectangle */
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if ((stack->npushed + 1) > stack->mxrects)
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{
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/* No then we will need to reallocate the stack to hole more */
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int mxrects = stack->mxrects ? 2 * stack->mxrects : NX_INITIAL_STACKSIZE;
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struct nxbe_cliprect_s *newstack;
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newstack = realloc(stack->stack, sizeof(struct nxbe_cliprect_s) * mxrects);
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if (!newstack)
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{
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gdbg("Failed to reallocate stack\n");
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return;
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}
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stack->stack = newstack;
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stack->mxrects = mxrects;
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}
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/* Then push the new rectangle onto the stack */
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stack->stack[stack->npushed].wnd = wnd;
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nxgl_rectcopy(&stack->stack[stack->npushed].rect, rect);
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stack->npushed++;
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}
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/****************************************************************************
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* Name: nxbe_poprectangle
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****************************************************************************/
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static inline boolean nxbe_poprectangle(struct nxbe_clipstack_s *stack,
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FAR struct nxbe_window_s **wnd,
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struct nxgl_rect_s *rect)
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{
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if(stack->npushed > 0)
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{
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stack->npushed--;
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*wnd = stack->stack[stack->npushed].wnd;
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nxgl_rectcopy(rect, &stack->stack[stack->npushed].rect);
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return TRUE;
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}
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return FALSE;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxbe_clipper
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*
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* Descripton:
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* Perform flexible clipping operations. Callbacks are executed for
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* each oscured and visible portions of the window.
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*
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* Input Parameters:
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* wnd - The window to be clipped.
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* rect - The region of concern within the window
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* order - Specifies the order to process the parts of the non-intersecting
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* sub-rectangles.
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* cops - The callbacks to handle obscured and visible parts of the
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* sub-rectangles.
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* plane - The raster operations to be used by the callback functions.
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* These may vary with different color formats.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void nxbe_clipper(FAR struct nxbe_window_s *wnd,
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FAR const struct nxgl_rect_s *dest, ubyte order,
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FAR struct nxbe_clipops_s *cops,
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FAR struct nxbe_plane_s *plane)
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{
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struct nxbe_clipstack_s stack;
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FAR struct nxbe_window_s *currw;
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struct nxgl_rect_s rect;
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struct nxgl_rect_s obscuredrect;
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struct nxgl_rect_s currbounds;
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struct nxgl_rect_s nonoverlapped[4];
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int i;
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/* Initialize the stack where we will keep deferred rectangle operations */
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stack.npushed = 0;
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stack.mxrects = 0;
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stack.stack = NULL;
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/* Loop until there are no further pending operations */
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nxgl_rectcopy(&rect, dest); /* Start with the whole dest rectangle */
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do
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{
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/* Loop for every window from the current window and above. Only windows
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* above the current window can obscure the current window
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*/
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for (currw = wnd; currw; currw = currw->above)
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{
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/* Does the current window overlap the dest rectangle? */
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currbounds = currw->bounds;
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if (nxgl_rectoverlap(&rect, &currbounds))
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{
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/* Yes.. then it obscures all or part of the dest rectangle.
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* Divide the potentially visible, non-overlapping regions into 4
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* smaller rectangles and push them onto the stack for processing
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* on the next time through the outer loop.
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*/
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nxgl_nonintersecting(nonoverlapped, &rect, &currbounds);
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for (i = 3; i >= 0; i--)
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{
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/* Push the rectangles in the order specific by the input
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* argument of that name.
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*/
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struct nxgl_rect_s *candidate = &nonoverlapped[g_nxcliporder[order][i]];
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if (!nxgl_nullrect(candidate))
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{
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nxbe_pushrectangle(&stack, currw->above, candidate);
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}
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}
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/* Now performed any required processing on the obscurred,
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* overlapped region.
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*/
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nxgl_rectintersect(&obscuredrect, &rect, &currbounds);
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cops->obscured(cops, plane, &obscuredrect);
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/* Break out of the loop to process the pushed rectangles */
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break;
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}
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}
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/* If there are no other windows overlapping this rectangle, then this
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* rectangular region must be visible.
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*/
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if (!currw && !nxgl_nullrect(&rect))
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{
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cops->visible(cops, plane, &rect);
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}
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}
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while (nxbe_poprectangle(&stack, &wnd, &rect));
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/* Done! If any stack was allocated, then free it before exit-ting */
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if (stack.stack)
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{
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free(stack.stack);
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}
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}
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/****************************************************************************
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* Name: nxbe_clipnull
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*
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* Descripton:
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* The do-nothing clipping callback function
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*
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****************************************************************************/
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void nxbe_clipnull(FAR struct nxbe_clipops_s *cops,
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FAR struct nxbe_plane_s *plane,
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FAR const struct nxgl_rect_s *rect)
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{
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}
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