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| Rev | Author | Line No. | Line |
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| 57 | pj | 1 | /* $Id: s_zoom.c,v 1.1 2003-02-28 11:49:43 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | #include "glheader.h" |
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| 28 | #include "macros.h" |
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| 29 | #include "imports.h" |
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| 30 | #include "colormac.h" |
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| 31 | |||
| 32 | #include "s_context.h" |
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| 33 | #include "s_span.h" |
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| 34 | #include "s_stencil.h" |
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| 35 | #include "s_zoom.h" |
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| 36 | |||
| 37 | |||
| 38 | /* |
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| 39 | * Helper function called from _mesa_write_zoomed_rgba/rgb/index_span(). |
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| 40 | */ |
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| 41 | static void |
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| 42 | zoom_span( GLcontext *ctx, const struct sw_span *span, |
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| 43 | const GLvoid *src, GLint y0, GLenum format ) |
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| 44 | { |
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| 45 | GLint r0, r1, row; |
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| 46 | GLint c0, c1, skipCol; |
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| 47 | GLint i, j; |
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| 48 | const GLuint maxWidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH ); |
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| 49 | GLchan rgbaSave[MAX_WIDTH][4]; |
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| 50 | GLuint indexSave[MAX_WIDTH]; |
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| 51 | const GLchan (*rgba)[4] = (const GLchan (*)[4]) src; |
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| 52 | const GLchan (*rgb)[3] = (const GLchan (*)[3]) src; |
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| 53 | const GLuint *indexes = (const GLuint *) src; |
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| 54 | struct sw_span zoomed; |
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| 55 | struct span_arrays zoomed_arrays; /* this is big! */ |
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| 56 | |||
| 57 | /* no pixel arrays! */ |
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| 58 | ASSERT((span->arrayMask & SPAN_XY) == 0); |
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| 59 | ASSERT(span->primitive == GL_BITMAP); |
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| 60 | |||
| 61 | INIT_SPAN(zoomed, GL_BITMAP, 0, 0, 0); |
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| 62 | zoomed.array = &zoomed_arrays; |
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| 63 | |||
| 64 | if (format == GL_RGBA || format == GL_RGB) { |
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| 65 | zoomed.z = span->z; |
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| 66 | zoomed.zStep = span->z; |
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| 67 | zoomed.fog = span->fog; |
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| 68 | zoomed.fogStep = span->fogStep; |
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| 69 | zoomed.interpMask = span->interpMask & ~SPAN_RGBA; |
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| 70 | zoomed.arrayMask |= SPAN_RGBA; |
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| 71 | } |
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| 72 | else if (format == GL_COLOR_INDEX) { |
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| 73 | zoomed.z = span->z; |
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| 74 | zoomed.zStep = span->z; |
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| 75 | zoomed.fog = span->fog; |
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| 76 | zoomed.fogStep = span->fogStep; |
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| 77 | zoomed.interpMask = span->interpMask & ~SPAN_INDEX; |
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| 78 | zoomed.arrayMask |= SPAN_INDEX; |
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| 79 | } |
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| 80 | |||
| 81 | /* |
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| 82 | * Compute which columns to draw: [c0, c1) |
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| 83 | */ |
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| 84 | c0 = (GLint) span->x; |
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| 85 | c1 = (GLint) (span->x + span->end * ctx->Pixel.ZoomX); |
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| 86 | if (c0 == c1) { |
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| 87 | return; |
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| 88 | } |
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| 89 | else if (c1 < c0) { |
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| 90 | /* swap */ |
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| 91 | GLint ctmp = c1; |
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| 92 | c1 = c0; |
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| 93 | c0 = ctmp; |
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| 94 | } |
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| 95 | if (c0 < 0) { |
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| 96 | zoomed.x = 0; |
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| 97 | zoomed.start = 0; |
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| 98 | zoomed.end = c1; |
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| 99 | skipCol = -c0; |
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| 100 | } |
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| 101 | else { |
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| 102 | zoomed.x = c0; |
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| 103 | zoomed.start = 0; |
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| 104 | zoomed.end = c1 - c0; |
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| 105 | skipCol = 0; |
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| 106 | } |
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| 107 | if (zoomed.end > maxWidth) |
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| 108 | zoomed.end = maxWidth; |
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| 109 | |||
| 110 | /* |
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| 111 | * Compute which rows to draw: [r0, r1) |
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| 112 | */ |
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| 113 | row = span->y - y0; |
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| 114 | r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY); |
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| 115 | r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY); |
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| 116 | if (r0 == r1) { |
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| 117 | return; |
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| 118 | } |
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| 119 | else if (r1 < r0) { |
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| 120 | /* swap */ |
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| 121 | GLint rtmp = r1; |
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| 122 | r1 = r0; |
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| 123 | r0 = rtmp; |
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| 124 | } |
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| 125 | |||
| 126 | ASSERT(r0 < r1); |
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| 127 | ASSERT(c0 < c1); |
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| 128 | |||
| 129 | /* |
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| 130 | * Trivial clip rejection testing. |
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| 131 | */ |
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| 132 | if (r1 < 0) /* below window */ |
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| 133 | return; |
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| 134 | if (r0 >= (GLint) ctx->DrawBuffer->Height) /* above window */ |
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| 135 | return; |
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| 136 | if (c1 < 0) /* left of window */ |
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| 137 | return; |
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| 138 | if (c0 >= (GLint) ctx->DrawBuffer->Width) /* right of window */ |
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| 139 | return; |
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| 140 | |||
| 141 | /* zoom the span horizontally */ |
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| 142 | if (format == GL_RGBA) { |
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| 143 | if (ctx->Pixel.ZoomX == -1.0F) { |
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| 144 | /* common case */ |
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| 145 | for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) { |
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| 146 | i = span->end - (j + skipCol) - 1; |
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| 147 | COPY_CHAN4(zoomed.array->rgba[j], rgba[i]); |
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| 148 | } |
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| 149 | } |
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| 150 | else { |
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| 151 | /* general solution */ |
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| 152 | const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX; |
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| 153 | for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) { |
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| 154 | i = (GLint) ((j + skipCol) * xscale); |
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| 155 | if (i < 0) |
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| 156 | i = span->end + i - 1; |
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| 157 | COPY_CHAN4(zoomed.array->rgba[j], rgba[i]); |
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| 158 | } |
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| 159 | } |
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| 160 | } |
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| 161 | else if (format == GL_RGB) { |
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| 162 | if (ctx->Pixel.ZoomX == -1.0F) { |
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| 163 | /* common case */ |
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| 164 | for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) { |
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| 165 | i = span->end - (j + skipCol) - 1; |
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| 166 | zoomed.array->rgba[j][0] = rgb[i][0]; |
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| 167 | zoomed.array->rgba[j][1] = rgb[i][1]; |
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| 168 | zoomed.array->rgba[j][2] = rgb[i][2]; |
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| 169 | zoomed.array->rgba[j][3] = CHAN_MAX; |
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| 170 | } |
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| 171 | } |
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| 172 | else { |
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| 173 | /* general solution */ |
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| 174 | const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX; |
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| 175 | for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) { |
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| 176 | i = (GLint) ((j + skipCol) * xscale); |
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| 177 | if (i < 0) |
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| 178 | i = span->end + i - 1; |
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| 179 | zoomed.array->rgba[j][0] = rgb[i][0]; |
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| 180 | zoomed.array->rgba[j][1] = rgb[i][1]; |
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| 181 | zoomed.array->rgba[j][2] = rgb[i][2]; |
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| 182 | zoomed.array->rgba[j][3] = CHAN_MAX; |
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| 183 | } |
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| 184 | } |
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| 185 | } |
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| 186 | else if (format == GL_COLOR_INDEX) { |
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| 187 | if (ctx->Pixel.ZoomX == -1.0F) { |
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| 188 | /* common case */ |
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| 189 | for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) { |
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| 190 | i = span->end - (j + skipCol) - 1; |
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| 191 | zoomed.array->index[j] = indexes[i]; |
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| 192 | } |
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| 193 | } |
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| 194 | else { |
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| 195 | /* general solution */ |
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| 196 | const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX; |
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| 197 | for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) { |
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| 198 | i = (GLint) ((j + skipCol) * xscale); |
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| 199 | if (i < 0) |
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| 200 | i = span->end + i - 1; |
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| 201 | zoomed.array->index[j] = indexes[i]; |
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| 202 | } |
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| 203 | } |
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| 204 | } |
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| 205 | |||
| 206 | /* write the span in rows [r0, r1) */ |
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| 207 | if (format == GL_RGBA || format == GL_RGB) { |
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| 208 | /* Writing the span may modify the colors, so make a backup now if we're |
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| 209 | * going to call _mesa_write_zoomed_span() more than once. |
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| 210 | */ |
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| 211 | if (r1 - r0 > 1) { |
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| 212 | MEMCPY(rgbaSave, zoomed.array->rgba, zoomed.end * 4 * sizeof(GLchan)); |
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| 213 | } |
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| 214 | for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) { |
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| 215 | _mesa_write_rgba_span(ctx, &zoomed); |
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| 216 | if (r1 - r0 > 1) { |
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| 217 | /* restore the colors */ |
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| 218 | MEMCPY(zoomed.array->rgba, rgbaSave, zoomed.end*4 * sizeof(GLchan)); |
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| 219 | } |
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| 220 | } |
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| 221 | } |
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| 222 | else if (format == GL_COLOR_INDEX) { |
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| 223 | if (r1 - r0 > 1) { |
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| 224 | MEMCPY(indexSave, zoomed.array->index, zoomed.end * sizeof(GLuint)); |
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| 225 | } |
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| 226 | for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) { |
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| 227 | _mesa_write_index_span(ctx, &zoomed); |
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| 228 | if (r1 - r0 > 1) { |
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| 229 | /* restore the colors */ |
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| 230 | MEMCPY(zoomed.array->index, indexSave, zoomed.end * sizeof(GLuint)); |
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| 231 | } |
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| 232 | } |
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| 233 | } |
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| 234 | } |
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| 235 | |||
| 236 | |||
| 237 | void |
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| 238 | _mesa_write_zoomed_rgba_span( GLcontext *ctx, const struct sw_span *span, |
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| 239 | CONST GLchan rgba[][4], GLint y0 ) |
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| 240 | { |
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| 241 | zoom_span(ctx, span, (const GLvoid *) rgba, y0, GL_RGBA); |
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| 242 | } |
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| 243 | |||
| 244 | |||
| 245 | void |
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| 246 | _mesa_write_zoomed_rgb_span( GLcontext *ctx, const struct sw_span *span, |
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| 247 | CONST GLchan rgb[][3], GLint y0 ) |
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| 248 | { |
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| 249 | zoom_span(ctx, span, (const GLvoid *) rgb, y0, GL_RGB); |
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| 250 | } |
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| 251 | |||
| 252 | |||
| 253 | void |
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| 254 | _mesa_write_zoomed_index_span( GLcontext *ctx, const struct sw_span *span, |
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| 255 | GLint y0 ) |
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| 256 | { |
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| 257 | zoom_span(ctx, span, (const GLvoid *) span->array->index, y0, GL_COLOR_INDEX); |
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| 258 | } |
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| 259 | |||
| 260 | |||
| 261 | /* |
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| 262 | * As above, but write stencil values. |
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| 263 | */ |
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| 264 | void |
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| 265 | _mesa_write_zoomed_stencil_span( GLcontext *ctx, |
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| 266 | GLuint n, GLint x, GLint y, |
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| 267 | const GLstencil stencil[], GLint y0 ) |
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| 268 | { |
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| 269 | GLint m; |
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| 270 | GLint r0, r1, row, r; |
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| 271 | GLint i, j, skipcol; |
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| 272 | GLstencil zstencil[MAX_WIDTH]; /* zoomed stencil values */ |
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| 273 | GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH ); |
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| 274 | |||
| 275 | /* compute width of output row */ |
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| 276 | m = (GLint) ABSF( n * ctx->Pixel.ZoomX ); |
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| 277 | if (m==0) { |
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| 278 | return; |
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| 279 | } |
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| 280 | if (ctx->Pixel.ZoomX<0.0) { |
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| 281 | /* adjust x coordinate for left/right mirroring */ |
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| 282 | x = x - m; |
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| 283 | } |
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| 284 | |||
| 285 | /* compute which rows to draw */ |
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| 286 | row = y-y0; |
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| 287 | r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY); |
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| 288 | r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY); |
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| 289 | if (r0==r1) { |
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| 290 | return; |
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| 291 | } |
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| 292 | else if (r1<r0) { |
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| 293 | GLint rtmp = r1; |
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| 294 | r1 = r0; |
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| 295 | r0 = rtmp; |
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| 296 | } |
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| 297 | |||
| 298 | /* return early if r0...r1 is above or below window */ |
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| 299 | if (r0<0 && r1<0) { |
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| 300 | /* below window */ |
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| 301 | return; |
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| 302 | } |
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| 303 | if (r0 >= (GLint) ctx->DrawBuffer->Height && |
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| 304 | r1 >= (GLint) ctx->DrawBuffer->Height) { |
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| 305 | /* above window */ |
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| 306 | return; |
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| 307 | } |
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| 308 | |||
| 309 | /* check if left edge is outside window */ |
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| 310 | skipcol = 0; |
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| 311 | if (x<0) { |
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| 312 | skipcol = -x; |
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| 313 | m += x; |
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| 314 | } |
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| 315 | /* make sure span isn't too long or short */ |
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| 316 | if (m>maxwidth) { |
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| 317 | m = maxwidth; |
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| 318 | } |
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| 319 | else if (m<=0) { |
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| 320 | return; |
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| 321 | } |
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| 322 | |||
| 323 | ASSERT( m <= MAX_WIDTH ); |
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| 324 | |||
| 325 | /* zoom the span horizontally */ |
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| 326 | if (ctx->Pixel.ZoomX==-1.0F) { |
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| 327 | /* n==m */ |
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| 328 | for (j=0;j<m;j++) { |
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| 329 | i = n - (j+skipcol) - 1; |
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| 330 | zstencil[j] = stencil[i]; |
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| 331 | } |
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| 332 | } |
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| 333 | else { |
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| 334 | GLfloat xscale = 1.0F / ctx->Pixel.ZoomX; |
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| 335 | for (j=0;j<m;j++) { |
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| 336 | i = (GLint) ((j+skipcol) * xscale); |
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| 337 | if (i<0) i = n + i - 1; |
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| 338 | zstencil[j] = stencil[i]; |
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| 339 | } |
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| 340 | } |
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| 341 | |||
| 342 | /* write the span */ |
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| 343 | for (r=r0; r<r1; r++) { |
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| 344 | _mesa_write_stencil_span( ctx, m, x+skipcol, r, zstencil ); |
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| 345 | } |
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| 346 | } |