Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_CreateCursor.3 @ 2042:3908e1f808e1
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:56:36 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
| rev | line source |
|---|---|
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_CreateCursor" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_CreateCursor\- Creates a new mouse cursor\&. | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
| 8 \fBSDL_Cursor *\fBSDL_CreateCursor\fP\fR(\fBUint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y\fR); | |
| 9 .SH "DESCRIPTION" | |
| 10 .PP | |
| 11 Create a cursor using the specified \fBdata\fR and \fBmask\fR (in MSB format)\&. The cursor width must be a multiple of 8 bits\&. | |
| 12 .PP | |
| 13 The cursor is created in black and white according to the following: | |
| 14 .TP 20 | |
| 15 \fBData / Mask\fR | |
| 16 \fBResulting pixel on screen\fR | |
| 17 .TP 20 | |
| 18 0 / 1 | |
| 19 White | |
| 20 .TP 20 | |
| 21 1 / 1 | |
| 22 Black | |
| 23 .TP 20 | |
| 24 0 / 0 | |
| 25 Transparent | |
| 26 .TP 20 | |
| 27 1 / 0 | |
| 28 Inverted color if possible, black if not\&. | |
| 29 .PP | |
| 30 Cursors created with this function must be freed with \fISDL_FreeCursor\fR\&. | |
| 31 .SH "EXAMPLE" | |
| 32 .PP | |
| 33 .nf | |
| 34 \f(CW/* Stolen from the mailing list */ | |
| 35 /* Creates a new mouse cursor from an XPM */ | |
| 36 | |
| 37 | |
| 38 /* XPM */ | |
| 39 static const char *arrow[] = { | |
| 40 /* width height num_colors chars_per_pixel */ | |
| 41 " 32 32 3 1", | |
| 42 /* colors */ | |
| 43 "X c #000000", | |
| 44 "\&. c #ffffff", | |
| 45 " c None", | |
| 46 /* pixels */ | |
| 47 "X ", | |
| 48 "XX ", | |
| 49 "X\&.X ", | |
| 50 "X\&.\&.X ", | |
| 51 "X\&.\&.\&.X ", | |
| 52 "X\&.\&.\&.\&.X ", | |
| 53 "X\&.\&.\&.\&.\&.X ", | |
| 54 "X\&.\&.\&.\&.\&.\&.X ", | |
| 55 "X\&.\&.\&.\&.\&.\&.\&.X ", | |
| 56 "X\&.\&.\&.\&.\&.\&.\&.\&.X ", | |
| 57 "X\&.\&.\&.\&.\&.XXXXX ", | |
| 58 "X\&.\&.X\&.\&.X ", | |
| 59 "X\&.X X\&.\&.X ", | |
| 60 "XX X\&.\&.X ", | |
| 61 "X X\&.\&.X ", | |
| 62 " X\&.\&.X ", | |
| 63 " X\&.\&.X ", | |
| 64 " X\&.\&.X ", | |
| 65 " XX ", | |
| 66 " ", | |
| 67 " ", | |
| 68 " ", | |
| 69 " ", | |
| 70 " ", | |
| 71 " ", | |
| 72 " ", | |
| 73 " ", | |
| 74 " ", | |
| 75 " ", | |
| 76 " ", | |
| 77 " ", | |
| 78 " ", | |
| 79 "0,0" | |
| 80 }; | |
| 81 | |
| 82 static SDL_Cursor *init_system_cursor(const char *image[]) | |
| 83 { | |
| 84 int i, row, col; | |
| 85 Uint8 data[4*32]; | |
| 86 Uint8 mask[4*32]; | |
| 87 int hot_x, hot_y; | |
| 88 | |
| 89 i = -1; | |
| 90 for ( row=0; row<32; ++row ) { | |
| 91 for ( col=0; col<32; ++col ) { | |
| 92 if ( col % 8 ) { | |
| 93 data[i] <<= 1; | |
| 94 mask[i] <<= 1; | |
| 95 } else { | |
| 96 ++i; | |
| 97 data[i] = mask[i] = 0; | |
| 98 } | |
| 99 switch (image[4+row][col]) { | |
| 100 case \&'X\&': | |
| 101 data[i] |= 0x01; | |
| 102 k[i] |= 0x01; | |
| 103 break; | |
| 104 case \&'\&.\&': | |
| 105 mask[i] |= 0x01; | |
| 106 break; | |
| 107 case \&' \&': | |
| 108 break; | |
| 109 } | |
| 110 } | |
| 111 } | |
| 112 sscanf(image[4+row], "%d,%d", &hot_x, &hot_y); | |
| 113 return SDL_CreateCursor(data, mask, 32, 32, hot_x, hot_y); | |
| 114 }\fR | |
| 115 .fi | |
| 116 .PP | |
| 117 .SH "SEE ALSO" | |
| 118 .PP | |
| 119 \fI\fBSDL_FreeCursor\fP\fR, \fI\fBSDL_SetCursor\fP\fR, \fI\fBSDL_ShowCursor\fP\fR | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
120 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |