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From: "Alex Volkov" Date: Thu, 10 Nov 2005 21:53:40 -0500 Subject: [SDL] BUG[?]: 32bpp RGBA->RGB colorkey blit, no SDL_SRCALPHA It seems there is either a documentation vs. reality mismatch or a real bug in SDL_blit_N.c:BlitNtoNKey(). The exact blit in question is a 32bpp RGBA->RGB, where RGBA has SDL_COLORKEY and *no* SDL_SRCALPHA flags. The doc in SDL_video.h states: * RGBA->RGB: * SDL_SRCALPHA not set: * copy RGB. * if SDL_SRCCOLORKEY set, only copy the pixels matching the * RGB values of the source colour key, ignoring alpha in the * comparison. BlitNtoNKey(), however, forgets to "ignore alpha in the comparison". The documentation makes perfect sense, so I think it is the code that is faulty. The attached patch corrects the code.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:43:15 +0000
parents e5bc29de3f0a
children 546f7c1eb755
rev   line source
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e5bc29de3f0a Updated from the SDL Documentation Project
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1 .TH "SDL_SetClipRect" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_SetClipRect\- Sets the clipping rectangle for a surface\&.
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBvoid \fBSDL_SetClipRect\fP\fR(\fBSDL_Surface *surface, SDL_Rect *rect\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 Sets the clipping rectangle for a surface\&. When this surface is the destination of a blit, only the area within the clip rectangle will be drawn into\&.
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12 .PP
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13 The rectangle pointed to by \fBrect\fR will be clipped to the edges of the surface so that the clip rectangle for a surface can never fall outside the edges of the surface\&.
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14 .PP
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15 If \fBrect\fR is \fBNULL\fP the clipping rectangle will be set to the full size of the surface\&.
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16 .SH "SEE ALSO"
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17 .PP
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18 \fI\fBSDL_GetClipRect\fP\fR, \fI\fBSDL_BlitSurface\fP\fR, \fI\fBSDL_Surface\fR\fR
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19 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01