sdl-ios-xcode: src/video/SDL

annotate src/video/SDL_rect.c @ 5212:115fff0641ee

Prefer the OpenGL ES 2.0 context when it's available, make it possible to create an OpenGL 2.0 context on iPhoneOS

author	Sam Lantinga <slouken@libsdl.org>
date	Sun, 06 Feb 2011 10:22:25 -0800
parents	307ccc9c135e
children	b530ef003506

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
3697 f7b03b6838cb Fixed bug #926 Sam Lantinga <slouken@libsdl.org> parents: 3542 diff changeset	3 Copyright (C) 1997-2010 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
5157 fb424691cfc7 Moved the rendering code out to a separate directory in the hope that it can someday be completely decoupled from the rest of the library and be expanded to an awesome 2D on 3D library. Sam Lantinga <slouken@libsdl.org> parents: 4456 diff changeset	24 #include "SDL_rect.h"
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	25
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 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	27 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	28 {
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 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	30
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 /* 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	32 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	33 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	34 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	35 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	36 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	37 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	38 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	39 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	40 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	41 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	42
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 /* 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	44 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	45 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	46 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	47 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	48 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	49 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	50 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	51 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	52 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	53 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	54
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 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	56 }
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 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	59 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	60 {
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 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	62
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 /* 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	64 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	65 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	66 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	67 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	68 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	69 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	70 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	71 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	72 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	73 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	74
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 /* 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	76 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	77 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	78 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	79 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	80 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	81 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	82 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	83 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	84 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	85 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	86
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 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	88 }
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 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	91 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	92 {
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 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	94
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 /* 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	96 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	97 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	98 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	99 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	100 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	101 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	102 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	103 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	104 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	105 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	106
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 /* 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	108 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	109 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	110 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	111 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	112 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	113 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	114 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	115 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	116 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	117 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	118 }
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
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	120 SDL_bool
3536 0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	121 SDL_EnclosePoints(const SDL_Point * points, int count, const SDL_Rect * clip,
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	122 SDL_Rect * result)
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	123 {
4456 0a5dbe96c3be Fixed variable use before initialize warnings Sam Lantinga <slouken@libsdl.org> parents: 3697 diff changeset	124 int minx = 0;
0a5dbe96c3be Fixed variable use before initialize warnings Sam Lantinga <slouken@libsdl.org> parents: 3697 diff changeset	125 int miny = 0;
0a5dbe96c3be Fixed variable use before initialize warnings Sam Lantinga <slouken@libsdl.org> parents: 3697 diff changeset	126 int maxx = 0;
0a5dbe96c3be Fixed variable use before initialize warnings Sam Lantinga <slouken@libsdl.org> parents: 3697 diff changeset	127 int maxy = 0;
3536 0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	128 int x, y, i;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	129
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	130 if (count < 1) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	131 return SDL_FALSE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	132 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	133
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	134 if (clip) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	135 SDL_bool added = SDL_FALSE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	136 int clip_minx = clip->x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	137 int clip_miny = clip->y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	138 int clip_maxx = clip->x+clip->w-1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	139 int clip_maxy = clip->y+clip->h-1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	140
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	141 for (i = 0; i < count; ++i) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	142 x = points[i].x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	143 y = points[i].y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	144
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	145 if (x < clip_minx \|\| x > clip_maxx \|\|
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	146 y < clip_miny \|\| y > clip_maxy) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	147 continue;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	148 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	149 if (!added) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	150 minx = maxx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	151 miny = maxy = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	152 added = SDL_TRUE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	153 continue;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	154 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	155 if (x < minx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	156 minx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	157 } else if (x > maxx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	158 maxx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	159 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	160 if (y < miny) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	161 miny = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	162 } else if (y > maxy) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	163 maxy = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	164 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	165 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	166 if (!added) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	167 return SDL_FALSE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	168 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	169 } else {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	170 /* No clipping, always add the first point */
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	171 minx = maxx = points[0].x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	172 miny = maxy = points[0].y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	173
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	174 for (i = 1; i < count; ++i) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	175 x = points[i].x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	176 y = points[i].y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	177
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	178 if (x < minx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	179 minx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	180 } else if (x > maxx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	181 maxx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	182 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	183 if (y < miny) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	184 miny = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	185 } else if (y > maxy) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	186 maxy = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	187 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	188 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	189 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	190
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	191 if (result) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	192 result->x = minx;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	193 result->y = miny;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	194 result->w = (maxx-minx)+1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	195 result->h = (maxy-miny)+1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	196 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	197 return SDL_TRUE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	198 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	199
3541 0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	200 /* Use the Cohen-Sutherland algorithm for line clipping */
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	201 #define CODE_BOTTOM 1
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	202 #define CODE_TOP 2
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	203 #define CODE_LEFT 4
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	204 #define CODE_RIGHT 8
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	205
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	206 static int ComputeOutCode(const SDL_Rect * rect, int x, int y)
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	207 {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	208 int code = 0;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	209 if (y < 0) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	210 code \|= CODE_TOP;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	211 } else if (y >= rect->y + rect->h) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	212 code \|= CODE_BOTTOM;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	213 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	214 if (x < 0) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	215 code \|= CODE_LEFT;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	216 } else if (x >= rect->x + rect->w) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	217 code \|= CODE_RIGHT;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	218 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	219 return code;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	220 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	221
3536 0267b8b1595c Added interfaces for batch drawing of points, lines and rects: Sam Lantinga <slouken@libsdl.org> parents: 3046 diff changeset	222 SDL_bool
2920 cdb01906cb7e indent Sam Lantinga <slouken@libsdl.org> parents: 2909 diff changeset	223 SDL_IntersectRectAndLine(const SDL_Rect * rect, int X1, int Y1, int *X2,
cdb01906cb7e indent Sam Lantinga <slouken@libsdl.org> parents: 2909 diff changeset	224 int *Y2)
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	225 {
4456 0a5dbe96c3be Fixed variable use before initialize warnings Sam Lantinga <slouken@libsdl.org> parents: 3697 diff changeset	226 int x = 0;
0a5dbe96c3be Fixed variable use before initialize warnings Sam Lantinga <slouken@libsdl.org> parents: 3697 diff changeset	227 int y = 0;
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	228 int x1, y1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	229 int x2, y2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	230 int rectx1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	231 int recty1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	232 int rectx2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	233 int recty2;
3541 0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	234 int outcode1, outcode2;
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	235
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	236 if (!rect \|\| !X1 \|\| !Y1 \|\| !X2 \|\| !Y2) {
3046 47965eacde88 Fix recommended by Eddy L O Jansson Sam Lantinga <slouken@libsdl.org> parents: 3004 diff changeset	237 return SDL_FALSE;
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	238 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	239
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	240 x1 = *X1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	241 y1 = *Y1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	242 x2 = *X2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	243 y2 = *Y2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	244 rectx1 = rect->x;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	245 recty1 = rect->y;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	246 rectx2 = rect->x + rect->w - 1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	247 recty2 = rect->y + rect->h - 1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	248
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	249 /* Check to see if entire line is inside rect */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	250 if (x1 >= rectx1 && x1 <= rectx2 && x2 >= rectx1 && x2 <= rectx2 &&
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	251 y1 >= recty1 && y1 <= recty2 && y2 >= recty1 && y2 <= recty2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	252 return SDL_TRUE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	253 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	254
2994 7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500 Sam Lantinga <slouken@libsdl.org> parents: 2920 diff changeset	255 /* Check to see if entire line is to one side of rect */
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	256 if ((x1 < rectx1 && x2 < rectx1) \|\| (x1 > rectx2 && x2 > rectx2) \|\|
3004 f3d7226a8dfd Fixed lines intersecting the top corners of a rectangle Sam Lantinga <slouken@libsdl.org> parents: 2997 diff changeset	257 (y1 < recty1 && y2 < recty1) \|\| (y1 > recty2 && y2 > recty2)) {
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	258 return SDL_FALSE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	259 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	260
2994 7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500 Sam Lantinga <slouken@libsdl.org> parents: 2920 diff changeset	261 if (y1 == y2) {
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	262 /* Horizontal line, easy to clip */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	263 if (x1 < rectx1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	264 *X1 = rectx1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	265 } else if (x1 > rectx2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	266 *X1 = rectx2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	267 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	268 if (x2 < rectx1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	269 *X2 = rectx1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	270 } else if (x2 > rectx2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	271 *X2 = rectx2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	272 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	273 return SDL_TRUE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	274 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	275
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	276 if (x1 == x2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	277 /* Vertical line, easy to clip */
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	278 if (y1 < recty1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	279 *Y1 = recty1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	280 } else if (y1 > recty2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	281 *Y1 = recty2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	282 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	283 if (y2 < recty1) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	284 *Y2 = recty1;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	285 } else if (y2 > recty2) {
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	286 *Y2 = recty2;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	287 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	288 return SDL_TRUE;
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	289 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	290
3541 0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	291 /* More complicated Cohen-Sutherland algorithm */
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	292 outcode1 = ComputeOutCode(rect, x1, y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	293 outcode2 = ComputeOutCode(rect, x2, y2);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	294 while (outcode1 \|\| outcode2) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	295 if (outcode1 & outcode2) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	296 return SDL_FALSE;
2994 7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500 Sam Lantinga <slouken@libsdl.org> parents: 2920 diff changeset	297 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500 Sam Lantinga <slouken@libsdl.org> parents: 2920 diff changeset	298
3541 0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	299 if (outcode1) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	300 if (outcode1 & CODE_TOP) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	301 y = recty1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	302 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	303 } else if (outcode1 & CODE_BOTTOM) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	304 y = recty2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	305 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	306 } else if (outcode1 & CODE_LEFT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	307 x = rectx1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	308 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	309 } else if (outcode1 & CODE_RIGHT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	310 x = rectx2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	311 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	312 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	313 x1 = x;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	314 y1 = y;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	315 outcode1 = ComputeOutCode(rect, x, y);
3542 97eae5a705f9 Make sure we fully clip the first point before starting to adjust the second point. Sam Lantinga <slouken@libsdl.org> parents: 3541 diff changeset	316 } else {
3541 0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	317 if (outcode2 & CODE_TOP) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	318 y = recty1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	319 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	320 } else if (outcode2 & CODE_BOTTOM) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	321 y = recty2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	322 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	323 } else if (outcode2 & CODE_LEFT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	324 x = rectx1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	325 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	326 } else if (outcode2 & CODE_RIGHT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	327 x = rectx2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	328 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	329 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	330 x2 = x;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	331 y2 = y;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	332 outcode2 = ComputeOutCode(rect, x, y);
2994 7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500 Sam Lantinga <slouken@libsdl.org> parents: 2920 diff changeset	333 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500 Sam Lantinga <slouken@libsdl.org> parents: 2920 diff changeset	334 }
3541 0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	335 *X1 = x1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	336 *Y1 = y1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	337 *X2 = x2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	338 *Y2 = y2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping. Sam Lantinga <slouken@libsdl.org> parents: 3536 diff changeset	339 return SDL_TRUE;
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	340 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2859 diff changeset	341
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	342 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/video/SDL_rect.c @ 5212:115fff0641ee