Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 57 | pj | 1 | /* $Id: s_histogram.c,v 1.1 2003-02-28 11:49:42 pj Exp $ */ |
| 2 | |||
| 3 | /* |
||
| 4 | * Mesa 3-D graphics library |
||
| 5 | * Version: 3.5 |
||
| 6 | * |
||
| 7 | * Copyright (C) 1999-2001 Brian Paul All Rights Reserved. |
||
| 8 | * |
||
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
||
| 10 | * copy of this software and associated documentation files (the "Software"), |
||
| 11 | * to deal in the Software without restriction, including without limitation |
||
| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
||
| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
||
| 14 | * Software is furnished to do so, subject to the following conditions: |
||
| 15 | * |
||
| 16 | * The above copyright notice and this permission notice shall be included |
||
| 17 | * in all copies or substantial portions of the Software. |
||
| 18 | * |
||
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
||
| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
||
| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
||
| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
||
| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
||
| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
||
| 25 | */ |
||
| 26 | |||
| 27 | |||
| 28 | #include "glheader.h" |
||
| 29 | #include "colormac.h" |
||
| 30 | #include "image.h" |
||
| 31 | #include "mmath.h" |
||
| 32 | |||
| 33 | #include "s_context.h" |
||
| 34 | #include "s_histogram.h" |
||
| 35 | #include "s_span.h" |
||
| 36 | |||
| 37 | |||
| 38 | |||
| 39 | /* |
||
| 40 | * Update the min/max values from an array of fragment colors. |
||
| 41 | */ |
||
| 42 | void |
||
| 43 | _mesa_update_minmax(GLcontext *ctx, GLuint n, const GLfloat rgba[][4]) |
||
| 44 | { |
||
| 45 | GLuint i; |
||
| 46 | for (i = 0; i < n; i++) { |
||
| 47 | /* update mins */ |
||
| 48 | if (rgba[i][RCOMP] < ctx->MinMax.Min[RCOMP]) |
||
| 49 | ctx->MinMax.Min[RCOMP] = rgba[i][RCOMP]; |
||
| 50 | if (rgba[i][GCOMP] < ctx->MinMax.Min[GCOMP]) |
||
| 51 | ctx->MinMax.Min[GCOMP] = rgba[i][GCOMP]; |
||
| 52 | if (rgba[i][BCOMP] < ctx->MinMax.Min[BCOMP]) |
||
| 53 | ctx->MinMax.Min[BCOMP] = rgba[i][BCOMP]; |
||
| 54 | if (rgba[i][ACOMP] < ctx->MinMax.Min[ACOMP]) |
||
| 55 | ctx->MinMax.Min[ACOMP] = rgba[i][ACOMP]; |
||
| 56 | |||
| 57 | /* update maxs */ |
||
| 58 | if (rgba[i][RCOMP] > ctx->MinMax.Max[RCOMP]) |
||
| 59 | ctx->MinMax.Max[RCOMP] = rgba[i][RCOMP]; |
||
| 60 | if (rgba[i][GCOMP] > ctx->MinMax.Max[GCOMP]) |
||
| 61 | ctx->MinMax.Max[GCOMP] = rgba[i][GCOMP]; |
||
| 62 | if (rgba[i][BCOMP] > ctx->MinMax.Max[BCOMP]) |
||
| 63 | ctx->MinMax.Max[BCOMP] = rgba[i][BCOMP]; |
||
| 64 | if (rgba[i][ACOMP] > ctx->MinMax.Max[ACOMP]) |
||
| 65 | ctx->MinMax.Max[ACOMP] = rgba[i][ACOMP]; |
||
| 66 | } |
||
| 67 | } |
||
| 68 | |||
| 69 | |||
| 70 | /* |
||
| 71 | * Update the histogram values from an array of fragment colors. |
||
| 72 | */ |
||
| 73 | void |
||
| 74 | _mesa_update_histogram(GLcontext *ctx, GLuint n, const GLfloat rgba[][4]) |
||
| 75 | { |
||
| 76 | const GLint max = ctx->Histogram.Width - 1; |
||
| 77 | GLfloat w = (GLfloat) max; |
||
| 78 | GLuint i; |
||
| 79 | |||
| 80 | if (ctx->Histogram.Width == 0) |
||
| 81 | return; |
||
| 82 | |||
| 83 | for (i = 0; i < n; i++) { |
||
| 84 | GLint ri = IROUND(rgba[i][RCOMP] * w); |
||
| 85 | GLint gi = IROUND(rgba[i][GCOMP] * w); |
||
| 86 | GLint bi = IROUND(rgba[i][BCOMP] * w); |
||
| 87 | GLint ai = IROUND(rgba[i][ACOMP] * w); |
||
| 88 | ri = CLAMP(ri, 0, max); |
||
| 89 | gi = CLAMP(gi, 0, max); |
||
| 90 | bi = CLAMP(bi, 0, max); |
||
| 91 | ai = CLAMP(ai, 0, max); |
||
| 92 | ctx->Histogram.Count[ri][RCOMP]++; |
||
| 93 | ctx->Histogram.Count[gi][GCOMP]++; |
||
| 94 | ctx->Histogram.Count[bi][BCOMP]++; |
||
| 95 | ctx->Histogram.Count[ai][ACOMP]++; |
||
| 96 | } |
||
| 97 | } |