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 #define SC_SHIFT 24
  63 #endif
  64
  65 #ifndef SC_SHIFT
  66 #define SC_SHIFT 32
  67 #endif
  68
  69 #if SC_SHIFT == 24
  70 #define SC_NUM 0x1000000U
  71 #define SC_FIX 0
  72
  73 #ifndef SC_MUL
  74 #define SC_MUL(x, y) ((x) * (y) >> 24)
  75 #define SC_MUL_INIT
  76 #define SC_MUL_END
  77 #endif
  78
  79 #else /* SC_SHIFT == 32 */
  80 #define SC_NUM 0x80000000U
  81 #define SC_FIX 1
  82
  83 #ifndef SC_MUL
  84 #define SC_MUL(x, y) ((x) * (uint64_t)(y) >> 32)
  85 #define SC_MUL_INIT
  86 #define SC_MUL_END
  87 #endif
  88
  89 #endif
  90
  91 struct img_part {
  92     int len;
  93 #if !defined(HAVE_LCD_COLOR)
  94     uint8_t *buf;
  95 #else
  96     struct uint8_rgb* buf;
  97 #endif
  98 };
  99
 100 #ifdef HAVE_LCD_COLOR
 101 /* intermediate type used by the scaler for color output. greyscale version
 102    uses uint32_t
 103 */
 104 struct uint32_rgb {
 105     uint32_t r;
 106     uint32_t g;
 107     uint32_t b;
 108 };
 109 #endif
 110
 111 /* struct which contains various parameters shared between vertical scaler,
 112    horizontal scaler, and row output
 113 */
 114 struct scaler_context {
 115     uint32_t divisor;
 116     uint32_t round;
 117     struct bitmap *bm;
 118     struct dim *src;
 119     unsigned char *buf;
 120     bool dither;
 121     int len;
 122     void *args;
 123     struct img_part* (*store_part)(void *);
 124     void (*output_row)(uint32_t,void*,struct scaler_context*);
 125     bool (*h_scaler)(void*,struct scaler_context*, bool);
 126 };
 127
 128 struct custom_format {
 129     void (*output_row)(uint32_t,void*,struct scaler_context*);
 130     unsigned int (*get_size)(struct bitmap *bm);
 131 };
 132
 133 struct rowset;
 134 int recalc_dimension(struct dim *dst, struct dim *src);
 135
 136 int resize_on_load(struct bitmap *bm, bool dither,
 137                    struct dim *src, struct rowset *tmp_row,
 138                    unsigned char *buf, unsigned int len,
 139                    const struct custom_format *cformat,
 140                    struct img_part* (*store_part)(void *args),
 141                    void *args);
 142
 143 #endif /* _RESIZE_H_ */