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76 //******************************************************************************
77 //<MStar Software>
78 //------------------------------------------------------------------------------
79 // h2v2.cpp
80 // Upsampling/colorspace conversion (H2V2, YCbCr)
81 // Last updated: Nov. 16, 2000
82 // Copyright (C) 1994-2000 Rich Geldreich
83 // richgel@voicenet.com
84 //
85 //
86 // This library is free software; you can redistribute it and/or
87 // modify it under the terms of the GNU Lesser General Public
88 // License as published by the Free Software Foundation; either
89 // version 2.1 of the License, or (at your option) any later version.
90 //
91 // This library is distributed in the hope that it will be useful,
92 // but WITHOUT ANY WARRANTY; without even the implied warranty of
93 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
94 // Lesser General Public License for more details.
95 //
96 // You should have received a copy of the GNU Lesser General Public
97 // License along with this library; if not, write to the Free Software
98 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
99 //------------------------------------------------------------------------------
100
101 #include "jpegmain.h"
102 #include "apiJPEG.h"
103 #include "jpeg_cmodel.h"
104 //------------------------------------------------------------------------------
105 #define FIX(x, b) ((long) ((x) * (1L<<(b)) + 0.5))
106 //------------------------------------------------------------------------------
107 // YCbCr H2V2 (2x2:1:1, 6 blocks per MCU) to 24-bit RGB
108 // FIXME: Create all-asm version, so Intel Compiler isn't needed.
109
110 extern MS_U8 gu8Max_mcu_y_size; /* MCU's max. Y size in pixels */
111 extern MS_U16 gu16Max_mcus_per_row;
112 extern MS_U16 gu16Mcu_lines_left; /* total # lines left in this MCU */
113
msAPI_JPEG_H2V2Convert(void)114 void msAPI_JPEG_H2V2Convert( void )
115 {
116 U8 row = gu8Max_mcu_y_size - gu16Mcu_lines_left;
117 U8 *d0 = pgu8Scan_line_0;
118 U8 *d1 = pgu8scan_line_1;
119 U8 *y;
120 U8 *c;
121 U16 i, l, j;
122 //printf("H2V2::msAPI_JPEG_H2V2Convert\n");
123 if ( row < 8 )
124 {
125 y = gpu8Sample_buf + row * 8;
126 }
127 else
128 {
129 y = gpu8Sample_buf + 64 * 2 + ( row & 7 ) * 8;
130 }
131
132 c = gpu8Sample_buf + 64 * 4 + ( row >> 1 ) * 8;
133
134 for ( i = gu16Max_mcus_per_row; i > 0; i-- )
135 {
136 for ( l = 0; l < 2; l++ )
137 {
138 for ( j = 0; j < 8; j += 2 )
139 {
140 U8 cb = c[0];
141 U8 cr = c[64];
142
143 S32 rc = gs32Crr[cr];
144 S32 gc = ( ( gs32Crg[cr] + gs32Cbg[cb] ) >> 16 );
145 S32 bc = gs32Cbb[cb];
146
147 U16 yy = y[j];
148 d0[0] = JPEG_CMODEL_clamp( yy + rc );
149 d0[1] = JPEG_CMODEL_clamp( yy + gc );
150 d0[2] = JPEG_CMODEL_clamp( yy + bc );
151
152 yy = y[j + 1];
153 d0[4] = JPEG_CMODEL_clamp( yy + rc );
154 d0[5] = JPEG_CMODEL_clamp( yy + gc );
155 d0[6] = JPEG_CMODEL_clamp( yy + bc );
156
157 yy = y[j + 8];
158 d1[0] = JPEG_CMODEL_clamp( yy + rc );
159 d1[1] = JPEG_CMODEL_clamp( yy + gc );
160 d1[2] = JPEG_CMODEL_clamp( yy + bc );
161
162 yy = y[j + 8 + 1];
163 d1[4] = JPEG_CMODEL_clamp( yy + rc );
164 d1[5] = JPEG_CMODEL_clamp( yy + gc );
165 d1[6] = JPEG_CMODEL_clamp( yy + bc );
166
167 d0 += 8;
168 d1 += 8;
169
170 c++;
171 }
172 y += 64;
173 }
174
175 y += 64 * 6 - 64 * 2;
176 c += 64 * 6 - 8;
177 }
178 }
179
180