apps/recorder/resize.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Akio Idehara
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef _RESIZE_H_
  22 #define _RESIZE_H_
  23 #include "config.h"
  24 #include "lcd.h"
  25 #include "inttypes.h"
  26
  27 /****************************************************************
  28  * resize_on_load()
  29  *
  30  * resize bitmap on load with scaling
  31  *
  32  * If HAVE_LCD_COLOR then this func use smooth scaling algorithm
  33  * - downscaling both way use "Area Sampling"
  34  *   if IMG_RESIZE_BILINER or IMG_RESIZE_NEAREST is NOT set
  35  * - otherwise "Bilinear" or "Nearest Neighbour"
  36  *
  37  * If !(HAVE_LCD_COLOR) then use simple scaling algorithm "Nearest Neighbour"
  38  *
  39  * return -1 for error
  40  ****************************************************************/
  41
  42 /* nothing needs the on-stack buffer right now */
  43 #define MAX_SC_STACK_ALLOC 0
  44 #define HAVE_UPSCALER 1
  45
  46 #if defined(CPU_COLDFIRE)
  47 #define SC_NUM 0x80000000U
  48 #define SC_MUL_INIT \
  49     unsigned long macsr_st = coldfire_get_macsr(); \
  50     coldfire_set_macsr(EMAC_UNSIGNED);
  51 #define SC_MUL_END coldfire_set_macsr(macsr_st);
  52 #define SC_MUL(x, y) \
  53 ({ \
  54     unsigned long t; \
  55     asm ("mac.l    %[a], %[b], %%acc0\n\t" \
  56          "move.l %%accext01, %[t]\n\t" \
  57          "move.l #0, %%acc0\n\t" \
  58          : [t] "=r" (t) : [a] "r" (x), [b] "r" (y)); \
  59     t; \
  60 })
  61 #elif (CONFIG_CPU == SH7034)
  62 /* multiply two unsigned 32 bit values and return the top 32 bit
  63  * of the 64 bit result */
  64 static inline unsigned sc_mul32(unsigned a, unsigned b)
  65 {
  66     unsigned r, t1, t2, t3;
  67
  68     asm (
  69         "swap.w  %[a], %[t1]     \n" /* t1 = ba */
  70         "mulu    %[t1], %[b]     \n" /* a * d */
  71         "swap.w  %[b], %[t3]     \n" /* t3 = dc */
  72         "sts     macl, %[t2]     \n" /* t2 = a * d */
  73         "mulu    %[t1], %[t3]    \n" /* a * c */
  74         "sts     macl, %[r]      \n" /* hi = a * c */
  75         "mulu    %[a], %[t3]     \n" /* b * c */
  76         "clrt                    \n"
  77         "sts     macl, %[t3]     \n" /* t3 = b * c */
  78         "addc    %[t2], %[t3]    \n" /* t3 += t2, carry -> t2 */
  79         "movt    %[t2]           \n"
  80         "mulu    %[a], %[b]      \n" /* b * d */
  81         "mov     %[t3], %[t1]    \n" /* t2t3 <<= 16 */
  82         "xtrct   %[t2], %[t1]    \n"
  83         "mov     %[t1], %[t2]    \n"
  84         "shll16  %[t3]           \n"
  85         "sts     macl, %[t1]     \n" /* lo = b * d */
  86         "clrt                    \n" /* hi.lo += t2t3 */
  87         "addc    %[t3], %[t1]    \n"
  88         "addc    %[t2], %[r]     \n"
  89         : /* outputs */
  90         [r] "=&r"(r),
  91         [t1]"=&r"(t1),
  92         [t2]"=&r"(t2),
  93         [t3]"=&r"(t3)
  94         : /* inputs */
  95         [a] "r"  (a),
  96         [b] "r"  (b)
  97     );
  98     return r;
  99 }
 100 #define SC_MUL(x, y) sc_mul32(x, y)
 101 #define SC_MUL_INIT
 102 #define SC_MUL_END
 103 #endif
 104
 105 #ifndef SC_SHIFT
 106 #define SC_SHIFT 32
 107 #endif
 108
 109 #if SC_SHIFT == 24
 110 #define SC_NUM 0x1000000U
 111 #define SC_FIX 0
 112
 113 #ifndef SC_MUL
 114 #define SC_MUL(x, y) ((x) * (y) >> 24)
 115 #define SC_MUL_INIT
 116 #define SC_MUL_END
 117 #endif
 118
 119 #else /* SC_SHIFT == 32 */
 120 #define SC_NUM 0x80000000U
 121 #define SC_FIX 1
 122
 123 #ifndef SC_MUL
 124 #define SC_MUL(x, y) ((x) * (uint64_t)(y) >> 32)
 125 #define SC_MUL_INIT
 126 #define SC_MUL_END
 127 #endif
 128
 129 #endif
 130
 131 struct img_part {
 132     int len;
 133 #if !defined(HAVE_LCD_COLOR)
 134     uint8_t *buf;
 135 #else
 136     struct uint8_rgb* buf;
 137 #endif
 138 };
 139
 140 #ifdef HAVE_LCD_COLOR
 141 /* intermediate type used by the scaler for color output. greyscale version
 142    uses uint32_t
 143 */
 144 struct uint32_rgb {
 145     uint32_t r;
 146     uint32_t g;
 147     uint32_t b;
 148 };
 149 #endif
 150
 151 /* struct which contains various parameters shared between vertical scaler,
 152    horizontal scaler, and row output
 153 */
 154 struct scaler_context {
 155     uint32_t divisor;
 156     uint32_t round;
 157     struct bitmap *bm;
 158     struct dim *src;
 159     unsigned char *buf;
 160     bool dither;
 161     int len;
 162     void *args;
 163     struct img_part* (*store_part)(void *);
 164     void (*output_row)(uint32_t,void*,struct scaler_context*);
 165     bool (*h_scaler)(void*,struct scaler_context*, bool);
 166 };
 167
 168 struct custom_format {
 169     void (*output_row)(uint32_t,void*,struct scaler_context*);
 170     unsigned int (*get_size)(struct bitmap *bm);
 171 };
 172
 173 struct rowset;
 174 int recalc_dimension(struct dim *dst, struct dim *src);
 175
 176 int resize_on_load(struct bitmap *bm, bool dither,
 177                    struct dim *src, struct rowset *tmp_row,
 178                    unsigned char *buf, unsigned int len,
 179                    const struct custom_format *cformat,
 180                    struct img_part* (*store_part)(void *args),
 181                    void *args);
 182
 183 #endif /* _RESIZE_H_ */