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annotate src/video/SDL_blendrect.c @ 4525:3abf0b9cafad

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pelya 2010-07-12 03:53:48 PDT In function GLES_RenderCopy() in SDL_renderer_gles.c:819 there is one memcpy() that can be avoided if we're updating whole texture. Because of that the SDL 1.3 in compatibility mode is working even slower than software rendering in SDL 1.2.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 14 Jul 2010 07:31:35 -0700
parents f7b03b6838cb
children aa8888658021
rev   line source
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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1 /*
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2 SDL - Simple DirectMedia Layer
3697
f7b03b6838cb Fixed bug #926
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3 Copyright (C) 1997-2010 Sam Lantinga
3594
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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9
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10 This library is distributed in the hope that it will be useful,
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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14
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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15 You should have received a copy of the GNU Lesser General Public
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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19 Sam Lantinga
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_video.h"
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25
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26
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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27 int
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28 SDL_BlendRect(SDL_Surface * dst, const SDL_Rect * rect,
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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29 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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30 {
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31 SDL_Rect full_rect;
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32 SDL_Point points[5];
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33
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34 if (!dst) {
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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35 SDL_SetError("Passed NULL destination surface");
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36 return -1;
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37 }
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38
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39 /* If 'rect' == NULL, then outline the whole surface */
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40 if (!rect) {
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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41 full_rect.x = 0;
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42 full_rect.y = 0;
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43 full_rect.w = dst->w;
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44 full_rect.h = dst->h;
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45 rect = &full_rect;
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46 }
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47
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48 points[0].x = rect->x;
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49 points[0].y = rect->y;
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50 points[1].x = rect->x+rect->w-1;
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51 points[1].y = rect->y;
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52 points[2].x = rect->x+rect->w-1;
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53 points[2].y = rect->y+rect->h-1;
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54 points[3].x = rect->x;
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55 points[3].y = rect->y+rect->h-1;
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56 points[4].x = rect->x;
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57 points[4].y = rect->y;
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58 return SDL_BlendLines(dst, points, 5, blendMode, r, g, b, a);
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59 }
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60
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61 int
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62 SDL_BlendRects(SDL_Surface * dst, const SDL_Rect ** rects, int count,
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63 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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64 {
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65 int i;
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66
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67 for (i = 0; i < count; ++i) {
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68 if (SDL_BlendRect(dst, rects[i], blendMode, r, g, b, a) < 0) {
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69 return -1;
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70 }
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71 }
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72 return 0;
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73 }
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74
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75 /* vi: set ts=4 sw=4 expandtab: */