sdl-ios-xcode: src/video/SDL

annotate src/video/SDL_rect.c @ 5282:8e421890cdb8

Fixed bug #1117 There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 12 Feb 2011 19:02:14 -0800
parents	b530ef003506
children

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
5267 b530ef003506 Happy 2011! :) Sam Lantinga <slouken@libsdl.org> parents: 5159 diff changeset	3 Copyright (C) 1997-2011 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 @ 5282:8e421890cdb8