src/video/SDL_rect.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 09 May 2010 15:24:31 -0700
changeset 4456 0a5dbe96c3be
parent 3697 f7b03b6838cb
child 5154 fb424691cfc7
permissions -rw-r--r--
Fixed variable use before initialize warnings
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2010 Sam Lantinga
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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 2.1 of the License, or (at your option) any later version.
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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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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "SDL_rect_c.h"
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SDL_bool
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SDL_HasIntersection(const SDL_Rect * A, const SDL_Rect * B)
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{
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    int Amin, Amax, Bmin, Bmax;
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    /* Horizontal intersection */
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    Amin = A->x;
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    Amax = Amin + A->w;
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    Bmin = B->x;
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    Bmax = Bmin + B->w;
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    if (Bmin > Amin)
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        Amin = Bmin;
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    if (Bmax < Amax)
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        Amax = Bmax;
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    if (Amax <= Amin)
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        return SDL_FALSE;
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    /* Vertical intersection */
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    Amin = A->y;
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    Amax = Amin + A->h;
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    Bmin = B->y;
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    Bmax = Bmin + B->h;
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    if (Bmin > Amin)
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        Amin = Bmin;
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    if (Bmax < Amax)
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        Amax = Bmax;
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    if (Amax <= Amin)
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        return SDL_FALSE;
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    return SDL_TRUE;
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}
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SDL_bool
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SDL_IntersectRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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{
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    int Amin, Amax, Bmin, Bmax;
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    /* Horizontal intersection */
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    Amin = A->x;
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    Amax = Amin + A->w;
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    Bmin = B->x;
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    Bmax = Bmin + B->w;
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    if (Bmin > Amin)
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        Amin = Bmin;
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    result->x = Amin;
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    if (Bmax < Amax)
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        Amax = Bmax;
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    result->w = Amax - Amin;
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    /* Vertical intersection */
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    Amin = A->y;
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    Amax = Amin + A->h;
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    Bmin = B->y;
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    Bmax = Bmin + B->h;
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    if (Bmin > Amin)
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        Amin = Bmin;
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    result->y = Amin;
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    if (Bmax < Amax)
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        Amax = Bmax;
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    result->h = Amax - Amin;
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    return !SDL_RectEmpty(result);
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}
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void
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SDL_UnionRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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{
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    int Amin, Amax, Bmin, Bmax;
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    /* Horizontal union */
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    Amin = A->x;
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    Amax = Amin + A->w;
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    Bmin = B->x;
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    Bmax = Bmin + B->w;
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    if (Bmin < Amin)
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        Amin = Bmin;
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    result->x = Amin;
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    if (Bmax > Amax)
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        Amax = Bmax;
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    result->w = Amax - Amin;
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    /* Vertical intersection */
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    Amin = A->y;
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    Amax = Amin + A->h;
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    Bmin = B->y;
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    Bmax = Bmin + B->h;
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    if (Bmin < Amin)
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        Amin = Bmin;
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    result->y = Amin;
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    if (Bmax > Amax)
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        Amax = Bmax;
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    result->h = Amax - Amin;
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}
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SDL_bool
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SDL_EnclosePoints(const SDL_Point * points, int count, const SDL_Rect * clip,
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                  SDL_Rect * result)
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{
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    int minx = 0;
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    int miny = 0;
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    int maxx = 0;
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    int maxy = 0;
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    int x, y, i;
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    if (count < 1) {
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        return SDL_FALSE;
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    }
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    if (clip) {
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        SDL_bool added = SDL_FALSE;
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        int clip_minx = clip->x;
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        int clip_miny = clip->y;
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        int clip_maxx = clip->x+clip->w-1;
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        int clip_maxy = clip->y+clip->h-1;
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        for (i = 0; i < count; ++i) {
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            x = points[i].x;
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            y = points[i].y;
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   145
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            if (x < clip_minx || x > clip_maxx ||
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                y < clip_miny || y > clip_maxy) {
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                continue;
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            }
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            if (!added) {
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                minx = maxx = x;
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                miny = maxy = y;
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                added = SDL_TRUE;
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                continue;
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            }
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            if (x < minx) {
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                minx = x;
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            } else if (x > maxx) {
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                maxx = x;
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            }
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            if (y < miny) {
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                miny = y;
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            } else if (y > maxy) {
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                maxy = y;
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            }
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        }
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        if (!added) {
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            return SDL_FALSE;
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        }
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    } else {
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        /* No clipping, always add the first point */
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        minx = maxx = points[0].x;
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        miny = maxy = points[0].y;
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        for (i = 1; i < count; ++i) {
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            x = points[i].x;
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            y = points[i].y;
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            if (x < minx) {
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                minx = x;
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            } else if (x > maxx) {
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                maxx = x;
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            }
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            if (y < miny) {
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                miny = y;
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            } else if (y > maxy) {
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                maxy = y;
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            }
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        }
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    }
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    if (result) {
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        result->x = minx;
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        result->y = miny;
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        result->w = (maxx-minx)+1;
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        result->h = (maxy-miny)+1;
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   197
    }
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    return SDL_TRUE;
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   199
}
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   201
/* Use the Cohen-Sutherland algorithm for line clipping */
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#define CODE_BOTTOM 1
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#define CODE_TOP    2
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#define CODE_LEFT   4
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#define CODE_RIGHT  8
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   206
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   207
static int ComputeOutCode(const SDL_Rect * rect, int x, int y)
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{
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   209
    int code = 0;
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   210
    if (y < 0) {
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   211
        code |= CODE_TOP;
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   212
    } else if (y >= rect->y + rect->h) {
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   213
        code |= CODE_BOTTOM;
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   214
    }
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   215
    if (x < 0) {
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   216
        code |= CODE_LEFT;
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   217
    } else if (x >= rect->x + rect->w) {
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   218
        code |= CODE_RIGHT;
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   219
    }
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   220
    return code;
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   221
}
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   222
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   223
SDL_bool
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   224
SDL_IntersectRectAndLine(const SDL_Rect * rect, int *X1, int *Y1, int *X2,
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   225
                         int *Y2)
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   226
{
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    int x = 0;
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    int y = 0;
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   229
    int x1, y1;
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   230
    int x2, y2;
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   231
    int rectx1;
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   232
    int recty1;
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   233
    int rectx2;
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   234
    int recty2;
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   235
    int outcode1, outcode2;
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   236
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   237
    if (!rect || !X1 || !Y1 || !X2 || !Y2) {
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   238
        return SDL_FALSE;
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   239
    }
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   240
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   241
    x1 = *X1;
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   242
    y1 = *Y1;
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   243
    x2 = *X2;
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   244
    y2 = *Y2;
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   245
    rectx1 = rect->x;
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   246
    recty1 = rect->y;
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   247
    rectx2 = rect->x + rect->w - 1;
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   248
    recty2 = rect->y + rect->h - 1;
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   249
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   250
    /* Check to see if entire line is inside rect */
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   251
    if (x1 >= rectx1 && x1 <= rectx2 && x2 >= rectx1 && x2 <= rectx2 &&
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   252
        y1 >= recty1 && y1 <= recty2 && y2 >= recty1 && y2 <= recty2) {
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   253
        return SDL_TRUE;
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   254
    }
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   255
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   256
    /* Check to see if entire line is to one side of rect */
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   257
    if ((x1 < rectx1 && x2 < rectx1) || (x1 > rectx2 && x2 > rectx2) ||
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   258
        (y1 < recty1 && y2 < recty1) || (y1 > recty2 && y2 > recty2)) {
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   259
        return SDL_FALSE;
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   260
    }
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diff changeset
   261
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   262
    if (y1 == y2) {
2909
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   263
        /* Horizontal line, easy to clip */
3da0bb421d83 Added line clipping
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diff changeset
   264
        if (x1 < rectx1) {
3da0bb421d83 Added line clipping
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   265
            *X1 = rectx1;
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diff changeset
   266
        } else if (x1 > rectx2) {
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diff changeset
   267
            *X1 = rectx2;
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diff changeset
   268
        }
3da0bb421d83 Added line clipping
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diff changeset
   269
        if (x2 < rectx1) {
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   270
            *X2 = rectx1;
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diff changeset
   271
        } else if (x2 > rectx2) {
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   272
            *X2 = rectx2;
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diff changeset
   273
        }
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   274
        return SDL_TRUE;
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   275
    }
3da0bb421d83 Added line clipping
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   276
3da0bb421d83 Added line clipping
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diff changeset
   277
    if (x1 == x2) {
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   278
        /* Vertical line, easy to clip */
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   279
        if (y1 < recty1) {
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   280
            *Y1 = recty1;
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diff changeset
   281
        } else if (y1 > recty2) {
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   282
            *Y1 = recty2;
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diff changeset
   283
        }
3da0bb421d83 Added line clipping
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diff changeset
   284
        if (y2 < recty1) {
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diff changeset
   285
            *Y2 = recty1;
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diff changeset
   286
        } else if (y2 > recty2) {
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diff changeset
   287
            *Y2 = recty2;
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diff changeset
   288
        }
3da0bb421d83 Added line clipping
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   289
        return SDL_TRUE;
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diff changeset
   290
    }
3da0bb421d83 Added line clipping
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diff changeset
   291
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   292
    /* More complicated Cohen-Sutherland algorithm */
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   293
    outcode1 = ComputeOutCode(rect, x1, y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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   294
    outcode2 = ComputeOutCode(rect, x2, y2);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   295
    while (outcode1 || outcode2) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   296
        if (outcode1 & outcode2) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   297
            return SDL_FALSE;
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diff changeset
   298
        }
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diff changeset
   299
3541
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   300
        if (outcode1) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   301
            if (outcode1 & CODE_TOP) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   302
                y = recty1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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   303
                x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   304
            } else if (outcode1 & CODE_BOTTOM) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   305
                y = recty2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   306
                x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   307
            } else if (outcode1 & CODE_LEFT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   308
                x = rectx1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   309
                y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   310
            } else if (outcode1 & CODE_RIGHT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   311
                x = rectx2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   312
                y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   313
            }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   314
            x1 = x;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   315
            y1 = y;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   316
            outcode1 = ComputeOutCode(rect, x, y);
3542
97eae5a705f9 Make sure we fully clip the first point before starting to adjust the second point.
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parents: 3541
diff changeset
   317
        } else {
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   318
            if (outcode2 & CODE_TOP) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   319
                y = recty1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   320
                x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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parents: 3536
diff changeset
   321
            } else if (outcode2 & CODE_BOTTOM) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   322
                y = recty2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   323
                x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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parents: 3536
diff changeset
   324
            } else if (outcode2 & CODE_LEFT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   325
                x = rectx1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
   326
                y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
   327
            } else if (outcode2 & CODE_RIGHT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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parents: 3536
diff changeset
   328
                x = rectx2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   329
                y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
   330
            }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   331
            x2 = x;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   332
            y2 = y;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
   333
            outcode2 = ComputeOutCode(rect, x, y);
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
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parents: 2920
diff changeset
   334
        }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
   335
    }
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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parents: 3536
diff changeset
   336
    *X1 = x1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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parents: 3536
diff changeset
   337
    *Y1 = y1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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parents: 3536
diff changeset
   338
    *X2 = x2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   339
    *Y2 = y2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
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diff changeset
   340
    return SDL_TRUE;
2909
3da0bb421d83 Added line clipping
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parents: 2859
diff changeset
   341
}
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   342
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
   343
void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
   344
SDL_AddDirtyRect(SDL_DirtyRectList * list, const SDL_Rect * rect)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
   345
{
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   346
    SDL_DirtyRect *dirty;
2223
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   347
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   348
    /* FIXME: At what point is this optimization too expensive? */
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   349
    for (dirty = list->list; dirty; dirty = dirty->next) {
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   350
        if (SDL_HasIntersection(&dirty->rect, rect)) {
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   351
            SDL_UnionRect(&dirty->rect, rect, &dirty->rect);
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   352
            return;
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   353
        }
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   354
    }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   355
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   356
    if (list->free) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   357
        dirty = list->free;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   358
        list->free = dirty->next;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   359
    } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   360
        dirty = (SDL_DirtyRect *) SDL_malloc(sizeof(*dirty));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   361
        if (!dirty) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   362
            return;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   363
        }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   364
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   365
    dirty->rect = *rect;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   366
    dirty->next = list->list;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   367
    list->list = dirty;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   368
}
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   369
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   370
void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   371
SDL_ClearDirtyRects(SDL_DirtyRectList * list)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   372
{
2224
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   373
    SDL_DirtyRect *prev, *curr;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   374
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   375
    /* Skip to the end of the free list */
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   376
    prev = NULL;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   377
    for (curr = list->free; curr; curr = curr->next) {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   378
        prev = curr;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   379
    }
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   380
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   381
    /* Add the list entries to the end */
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   382
    if (prev) {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   383
        prev->next = list->list;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   384
    } else {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   385
        list->free = list->list;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
   386
    }
2223
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   387
    list->list = NULL;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   388
}
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   389
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   390
void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   391
SDL_FreeDirtyRects(SDL_DirtyRectList * list)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   392
{
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   393
    while (list->list) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   394
        SDL_DirtyRect *elem = list->list;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   395
        list->list = elem->next;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   396
        SDL_free(elem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   397
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   398
    while (list->free) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   399
        SDL_DirtyRect *elem = list->free;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   400
        list->free = elem->next;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   401
        SDL_free(elem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   402
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   403
}
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   404
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   405
/* vi: set ts=4 sw=4 expandtab: */