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57 | pj | 1 | /* $Id: s_zoom.c,v 1.1 2003-02-28 11:49:43 pj Exp $ */ |
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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 | } |