sdl-ios-xcode: src/video/SDL

annotate src/video/SDL_rect.c @ 2912:1d50666ed3d5

Fixed clipping source rect to match destination rect clipping

author	Sam Lantinga <slouken@libsdl.org>
date	Tue, 23 Dec 2008 04:51:36 +0000
parents	3da0bb421d83
children	cdb01906cb7e

rev	line source
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	1 /*
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	2 SDL - Simple DirectMedia Layer
2859 99210400e8b9 Updated copyright date Sam Lantinga <slouken@libsdl.org> parents: 2275 diff changeset	3 Copyright (C) 1997-2009 Sam Lantinga
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	4
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	5 This library is free software; you can redistribute it and/or
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	6 modify it under the terms of the GNU Lesser General Public
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	7 License as published by the Free Software Foundation; either
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	8 version 2.1 of the License, or (at your option) any later version.
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	9
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	10 This library is distributed in the hope that it will be useful,
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	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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	13 Lesser General Public License for more details.
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	14
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	15 You should have received a copy of the GNU Lesser General Public
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	16 License along with this library; if not, write to the Free Software
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	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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	18
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	19 Sam Lantinga
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	20 slouken@libsdl.org
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	21 */
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	22 #include "SDL_config.h"
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	23
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	24 #include "SDL_video.h"
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	25 #include "SDL_rect_c.h"
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	26
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	27 SDL_bool
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	28 SDL_HasIntersection(const SDL_Rect * A, const SDL_Rect * B)
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	29 {
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	30 int Amin, Amax, Bmin, Bmax;
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	31
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	32 /* Horizontal intersection */
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	33 Amin = A->x;
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	34 Amax = Amin + A->w;
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	35 Bmin = B->x;
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	36 Bmax = Bmin + B->w;
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	37 if (Bmin > Amin)
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	38 Amin = Bmin;
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	39 if (Bmax < Amax)
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	40 Amax = Bmax;
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	41 if (Amax <= Amin)
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	42 return SDL_FALSE;
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	43
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	44 /* Vertical intersection */
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	45 Amin = A->y;
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	46 Amax = Amin + A->h;
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	47 Bmin = B->y;
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	48 Bmax = Bmin + B->h;
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	49 if (Bmin > Amin)
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	50 Amin = Bmin;
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	51 if (Bmax < Amax)
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	52 Amax = Bmax;
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	53 if (Amax <= Amin)
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	54 return SDL_FALSE;
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	55
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	56 return SDL_TRUE;
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	57 }
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	58
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	59 SDL_bool
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	60 SDL_IntersectRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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	61 {
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	62 int Amin, Amax, Bmin, Bmax;
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	63
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	64 /* Horizontal intersection */
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	65 Amin = A->x;
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	66 Amax = Amin + A->w;
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	67 Bmin = B->x;
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	68 Bmax = Bmin + B->w;
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	69 if (Bmin > Amin)
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	70 Amin = Bmin;
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	71 result->x = Amin;
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	72 if (Bmax < Amax)
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	73 Amax = Bmax;
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	74 result->w = Amax - Amin;
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	75
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	76 /* Vertical intersection */
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	77 Amin = A->y;
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	78 Amax = Amin + A->h;
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	79 Bmin = B->y;
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	80 Bmax = Bmin + B->h;
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	81 if (Bmin > Amin)
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	82 Amin = Bmin;
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	83 result->y = Amin;
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	84 if (Bmax < Amax)
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	85 Amax = Bmax;
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	86 result->h = Amax - Amin;
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	87
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	88 return !SDL_RectEmpty(result);
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	89 }
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	90
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	91 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	92 SDL_UnionRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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	93 {
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	94 int Amin, Amax, Bmin, Bmax;
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	95
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	96 /* Horizontal union */
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	97 Amin = A->x;
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	98 Amax = Amin + A->w;
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	99 Bmin = B->x;
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	100 Bmax = Bmin + B->w;
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	101 if (Bmin < Amin)
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	102 Amin = Bmin;
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	103 result->x = Amin;
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	104 if (Bmax > Amax)
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	105 Amax = Bmax;
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	106 result->w = Amax - Amin;
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	107
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	108 /* Vertical intersection */
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	109 Amin = A->y;
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	110 Amax = Amin + A->h;
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	111 Bmin = B->y;
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	112 Bmax = Bmin + B->h;
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	113 if (Bmin < Amin)
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	114 Amin = Bmin;
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	115 result->y = Amin;
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	116 if (Bmax > Amax)
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	117 Amax = Bmax;
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	118 result->h = Amax - Amin;
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	119 }
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	120
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	121 SDL_bool
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	122 SDL_IntersectRectAndLine(const SDL_Rect rect, int X1, int Y1, int X2, int *Y2)
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	123 {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	124 int x1, y1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	125 int x2, y2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	126 int rectx1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	127 int recty1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	128 int rectx2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	129 int recty2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	130
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	131 if (!rect \|\| !X1 \|\| !Y1 \|\| !X2 \|\| !Y2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	132 SDL_FALSE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	133 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	134
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	135 x1 = *X1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	136 y1 = *Y1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	137 x2 = *X2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	138 y2 = *Y2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	139 rectx1 = rect->x;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	140 recty1 = rect->y;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	141 rectx2 = rect->x + rect->w - 1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	142 recty2 = rect->y + rect->h - 1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	143
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	144 /* Check to see if entire line is inside rect */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	145 if (x1 >= rectx1 && x1 <= rectx2 && x2 >= rectx1 && x2 <= rectx2 &&
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	146 y1 >= recty1 && y1 <= recty2 && y2 >= recty1 && y2 <= recty2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	147 return SDL_TRUE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	148 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	149
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	150 /* Check to see if entire line is outside rect */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	151 if ((x1 < rectx1 && x2 < rectx1) \|\| (x1 > rectx2 && x2 > rectx2) \|\|
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	152 (y1 < recty1 && y2 < recty2) \|\| (y1 > recty2 && y2 > recty2)) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	153 return SDL_FALSE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	154 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	155
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	156 if (y1 = y2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	157 /* Horizontal line, easy to clip */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	158 if (x1 < rectx1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	159 *X1 = rectx1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	160 } else if (x1 > rectx2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	161 *X1 = rectx2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	162 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	163 if (x2 < rectx1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	164 *X2 = rectx1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	165 } else if (x2 > rectx2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	166 *X2 = rectx2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	167 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	168 return SDL_TRUE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	169 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	170
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	171 if (x1 == x2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	172 /* Vertical line, easy to clip */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	173 if (y1 < recty1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	174 *Y1 = recty1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	175 } else if (y1 > recty2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	176 *Y1 = recty2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	177 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	178 if (y2 < recty1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	179 *Y2 = recty1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	180 } else if (y2 > recty2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	181 *Y2 = recty2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	182 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	183 return SDL_TRUE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	184 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	185
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	186 /* FIXME: need code to clip diagonal line to rect */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	187 return SDL_FALSE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	188 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	189
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	190 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	191 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. Sam Lantinga <slouken@libsdl.org> parents: diff changeset	192 {
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	193 SDL_DirtyRect *dirty;
2223 175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	194
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	195 /* FIXME: At what point is this optimization too expensive? */
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	196 for (dirty = list->list; dirty; dirty = dirty->next) {
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	197 if (SDL_HasIntersection(&dirty->rect, rect)) {
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	198 SDL_UnionRect(&dirty->rect, rect, &dirty->rect);
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	199 return;
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	200 }
175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	201 }
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	202
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	203 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	204 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	205 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	206 } 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	207 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	208 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	209 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	210 }
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	211 }
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	212 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	213 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	214 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	215 }
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	216
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	217 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	218 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	219 {
2224 29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	220 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	221
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	222 /* 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	223 prev = NULL;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	224 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	225 prev = curr;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	226 }
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	227
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	228 /* 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	229 if (prev) {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	230 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	231 } else {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects() Sam Lantinga <slouken@libsdl.org> parents: 2223 diff changeset	232 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	233 }
2223 175754591a13 Optimized dirty rect code Sam Lantinga <slouken@libsdl.org> parents: 1895 diff changeset	234 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	235 }
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	236
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	237 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	238 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	239 {
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	240 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	241 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	242 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	243 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	244 }
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	245 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	246 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	247 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	248 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	249 }
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	250 }
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	251
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	252 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/video/SDL_rect.c @ 2912:1d50666ed3d5