BlinkenFrame.c (98af585) - BlinkenLib · BlinkenArea

BlinkenFrame.c

/* BlinkenLib
 * version 0.2 date 2005-01-27
 * Copyright 2004-2005 Stefan Schuermans <1stein@schuermans.info>
 * Copyleft: GNU public license - http://www.gnu.org/copyleft/gpl.html
 * a blinkenarea.org project
 * powered by eventphone.de
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "BlinkenConstants.h"
#include "BlinkenFrame.h"
#include "Tools.h"

struct sBlinkenFrame
{
  int height;
  int width;
  int channels;
  int maxval;
  int duration;
  unsigned char * * * pppData;
};

stBlinkenFrame * BlinkenFrameNew( int height, int width, int channels, int maxval, int duration )
{
  stBlinkenFrame * pFrame;

if( height < BlinkenHeightMin ) height = BlinkenHeightMin;
  if( height > BlinkenHeightMax ) height = BlinkenHeightMax;
  if( width < BlinkenWidthMin ) width = BlinkenWidthMin;
  if( width > BlinkenWidthMax ) width = BlinkenWidthMax;
  if( channels < BlinkenChannelsMin ) channels = BlinkenChannelsMin;
  if( channels > BlinkenChannelsMax ) channels = BlinkenMaxvalMax;
  if( maxval < BlinkenMaxvalMin ) maxval = BlinkenMaxvalMin;
  if( maxval > BlinkenMaxvalMax ) maxval = BlinkenMaxvalMax;
  if( duration < BlinkenDurationMin ) duration = BlinkenDurationMin;
  if( duration > BlinkenDurationMax ) duration = BlinkenDurationMax;

pFrame = (stBlinkenFrame *)malloc( sizeof( stBlinkenFrame ) );
  if( pFrame == NULL )
    return NULL;

pFrame->height = height;
  pFrame->width = width;
  pFrame->channels = channels;
  pFrame->maxval = maxval;
  pFrame->duration = duration;

pFrame->pppData = (unsigned char * * *)malloc3D( height, width, channels, sizeof( unsigned char ) );
  if( pFrame->pppData == NULL )
  {
    free( pFrame );
    return NULL;
  }

return pFrame;
}

stBlinkenFrame * BlinkenFrameClone( stBlinkenFrame * pSrcFrame )
{
  int y, x, c;
  stBlinkenFrame * pFrame;

if( pSrcFrame == NULL )
    return NULL;

pFrame = BlinkenFrameNew( pSrcFrame->height, pSrcFrame->width,
                            pSrcFrame->channels, pSrcFrame->maxval, pSrcFrame->duration );
  if( pFrame == NULL )
    return NULL;

for( y = 0; y < pFrame->height; y++ )
    for( x = 0; x < pFrame->width; x++ )
      for( c = 0; c < pFrame->channels; c++ )
        pFrame->pppData[y][x][c] = pSrcFrame->pppData[y][x][c];

return pFrame;
}

void BlinkenFrameFree( stBlinkenFrame * pFrame )
{
  if( pFrame == NULL )
    return;

free( pFrame->pppData );
  free( pFrame );
}

void BlinkenFrameClear( stBlinkenFrame * pFrame )
{
  int y, x, c;

if( pFrame == NULL )
    return;

for( y = 0; y < pFrame->height; y++ )
    for( x = 0; x < pFrame->width; x++ )
      for( c = 0; c < pFrame->channels; c++ )
        pFrame->pppData[y][x][c] = 0;
}

int BlinkenFrameGetHeight( stBlinkenFrame * pFrame )
{
  if( pFrame == NULL )
    return 0;

return pFrame->height;
}

int BlinkenFrameGetWidth( stBlinkenFrame * pFrame )
{
  if( pFrame == NULL )
    return 0;

return pFrame->width;
}

int BlinkenFrameGetChannels( stBlinkenFrame * pFrame )
{
  if( pFrame == NULL )
    return 0;

return pFrame->channels;
}

int BlinkenFrameGetMaxval( stBlinkenFrame * pFrame )
{
  if( pFrame == NULL )
    return 0;

return pFrame->maxval;
}

int BlinkenFrameGetDuration( stBlinkenFrame * pFrame )
{
  if( pFrame == NULL )
    return 0;

return pFrame->duration;
}

void BlinkenFrameSetDuration( stBlinkenFrame * pFrame, int duration )
{
  if( pFrame == NULL )
    return;

if( duration < BlinkenDurationMin ) duration = BlinkenDurationMin;
  if( duration > BlinkenDurationMax ) duration = BlinkenDurationMax;

pFrame->duration = duration;
}

unsigned char BlinkenFrameGetPixel( stBlinkenFrame * pFrame, int y, int x, int c )
{
  if( pFrame == NULL ||
      y < 0 || y >= pFrame->height ||
      x < 0 || x >= pFrame->width ||
      c < 0 || c >= pFrame->channels )
      return 0;

return pFrame->pppData[y][x][c];
}

void BlinkenFrameSetPixel( stBlinkenFrame * pFrame, int y, int x, int c, unsigned char val )
{
  if( pFrame == NULL ||
      y < 0 || y >= pFrame->height ||
      x < 0 || x >= pFrame->width ||
      c < 0 || c >= pFrame->channels )
      return;

if( val > pFrame->maxval )
    val = pFrame->maxval;
  pFrame->pppData[y][x][c] = val;
}

unsigned long BlinkenFrameGetColor( stBlinkenFrame * pFrame, int y, int x )
{
  if( pFrame == NULL ||
      y < 0 || y >= pFrame->height ||
      x < 0 || x >= pFrame->width )
      return 0;

if( pFrame->channels == 1 )
    return (((unsigned long)pFrame->pppData[y][x][0] * 255 + pFrame->maxval / 2) / pFrame->maxval) << 16 |
           (((unsigned long)pFrame->pppData[y][x][0] * 255 + pFrame->maxval / 2) / pFrame->maxval) << 8 |
           (((unsigned long)pFrame->pppData[y][x][0] * 255 + pFrame->maxval / 2) / pFrame->maxval);
  if( pFrame->channels == 2 )
    return (((unsigned long)pFrame->pppData[y][x][0] * 255 + pFrame->maxval / 2) / pFrame->maxval) << 16 |
           (((unsigned long)pFrame->pppData[y][x][1] * 255 + pFrame->maxval / 2) / pFrame->maxval) << 8;
  return (((unsigned long)pFrame->pppData[y][x][0] * 255 + pFrame->maxval / 2) / pFrame->maxval) << 16 |
         (((unsigned long)pFrame->pppData[y][x][1] * 255 + pFrame->maxval / 2) / pFrame->maxval) << 8 |
         (((unsigned long)pFrame->pppData[y][x][2] * 255 + pFrame->maxval / 2) / pFrame->maxval);
}

void BlinkenFrameSetColor( stBlinkenFrame * pFrame, int y, int x, unsigned long color )
{
  int alpha, alpha_, c;

if( pFrame == NULL ||
      y < 0 || y >= pFrame->height ||
      x < 0 || x >= pFrame->width )
      return;

alpha = (color >> 24) & 0xFF;
  alpha_ = 255 - alpha;
  if( pFrame->channels >= 1 )
    pFrame->pppData[y][x][0] = (unsigned char)(( ((((color >> 16) & 0xFF) * pFrame->maxval + 127) / 255) * alpha
                                               + (unsigned long)pFrame->pppData[y][x][0] * alpha_
                                               ) / 255);
  if( pFrame->channels >= 2 )
    pFrame->pppData[y][x][1] = (unsigned char)(( ((((color >> 8) & 0xFF) * pFrame->maxval + 127) / 255) * alpha
                                               + (unsigned long)pFrame->pppData[y][x][1] * alpha_
                                               ) / 255);
  if( pFrame->channels >= 3 )
    pFrame->pppData[y][x][2] = (unsigned char)(( (((color & 0xFF) * pFrame->maxval + 127) / 255) * alpha
                                               + (unsigned long)pFrame->pppData[y][x][2] * alpha_
                                               ) / 255);
  for( c = 3; c < pFrame->channels; c++ )
    pFrame->pppData[y][x][c] = (unsigned char)(( 0
                                               + (unsigned long)pFrame->pppData[y][x][c] * alpha_
                                               ) / 255);
}

void BlinkenFrameResize( stBlinkenFrame * pFrame, int height, int width, int channels, int maxval )
{
  unsigned char * * * pppData;
  int y, x, c;
  int emptyY, emptyX, skipY, skipX, rangeY, rangeX;
  unsigned long val, div;

if( pFrame == NULL )
    return;

if( height == pFrame->height &&
      width == pFrame->width &&
      channels == pFrame->channels &&
      maxval == pFrame->maxval )
    return;

//allocate new data array
  pppData = (unsigned char * * *)malloc3D( height, width, channels, sizeof( unsigned char ) );
  if( pppData == NULL )
    return;
  for( y = 0; y < height; y++ )
    for( x = 0; x < width; x++ )
      for( c = 0; c < channels; c++ )
        pppData[y][x][c] = 0;

//get number of pixels to skip / to leave empty in X and Y direction
  if( height > pFrame->height )
  {
    emptyY = (height - pFrame->height) / 2; 
    skipY = 0;
    rangeY = pFrame->height;
  }
  else
  {
    emptyY = 0;
    skipY = (pFrame->height - height) / 2;
    rangeY = height;
  }
  if( width > pFrame->width )
  {
    emptyX = (width - pFrame->width) / 2; 
    skipX = 0;
    rangeX = pFrame->width;
  }
  else
  {
    emptyX = 0;
    skipX = (pFrame->width - width) / 2;
    rangeX = width;
  }

//resize frame with help of calculated parameters
  for( y = 0; y < rangeY; y++ )
  {
    for( x = 0; x < rangeX; x++ )
    {
      if( channels >= pFrame->channels ) //add channels: copy last channel into new channels
      {
        for( c = 0; c < pFrame->channels; c++ )
          pppData[emptyY + y][emptyX + x][c] = (unsigned char)(((unsigned long)pFrame->pppData[skipY + y][skipX + x][c] * maxval + pFrame->maxval / 2) / pFrame->maxval);
        for( ; c < channels; c++ )
          pppData[emptyY + y][emptyX + x][c] = pppData[emptyY + y][emptyX + x][pFrame->channels - 1];
      }
      else //remove channels: merge leftover channels with last kept channel
      {
        val = 0;
        for( c = 0; c < channels - 1; c++ )
          pppData[emptyY + y][emptyX + x][c] = (unsigned char)(((unsigned long)pFrame->pppData[skipY + y][skipX + x][c] * maxval + pFrame->maxval / 2) / pFrame->maxval);
        for( c = channels - 1; c < pFrame->channels; c++ )
          val += (unsigned long)pFrame->pppData[skipY + y][skipX + x][c];
        div = pFrame->maxval * (pFrame->channels - channels + 1);
        pppData[emptyY + y][emptyX + x][channels - 1] = (unsigned char)((val * maxval + div / 2) / div);
      }
    }
  }

pFrame->height = height;
  pFrame->width = width;
  pFrame->channels = channels;
  pFrame->maxval = maxval;
  free( pFrame->pppData );
  pFrame->pppData = pppData;
}

void BlinkenFrameScale( stBlinkenFrame * pFrame, int height, int width )
{
  unsigned char * * * pppData;
  double scaleHor, scaleVer, ox, oy, ox1, oy1, val;
  int c, nx, ny, x, y, oxi, oyi, ox1i, oy1i;

if( pFrame == NULL )
    return;

if( height == pFrame->height &&
      width == pFrame->width )
    return;

scaleHor = (double)width / (double)pFrame->width;
  scaleVer = (double)height / (double)pFrame->height;

//allocate new data array
  pppData = (unsigned char * * *)malloc3D( height, width, pFrame->channels, sizeof( unsigned char ) );
  if( pppData == NULL )
    return;

//scale every channel
  for( c = 0; c < pFrame->channels; c++ )
  {
    for( ny = 0; ny < height; ny++ )
    {
      for( nx = 0; nx < width; nx++ )
      {
        oy = (double)ny / scaleVer; //sub-pixel exact range in old picture
        ox = (double)nx / scaleHor;
        oy1 = (double)(ny + 1) / scaleVer - 0.000001;
        ox1 = (double)(nx + 1) / scaleHor - 0.000001;
        if( oy < 0 || ox < 0 || oy1 >= pFrame->height || ox1 >= pFrame->width) //out of old picture
          pppData[ny][nx][c] = 0;
        else
        {
          oyi = (int)oy;
          oxi = (int)ox;
          oy1i = (int)oy1;
          ox1i = (int)ox1;
          if( oyi == oy1i )
          {
            if( oxi == ox1i) //one source pixel
            {
              val = (double)pFrame->pppData[oyi][oxi][c];
            }
            else //one line of source pixels
            {
              val = (double)pFrame->pppData[oyi][oxi][c] * (1 - ox + oxi)
                  + (double)pFrame->pppData[oyi][ox1i][c] * (ox1 - ox1i);
              for( x = oxi + 1; x < ox1i; x++ )
                val += (double)pFrame->pppData[oyi][x][c];
              val /= ox1 - ox;
            }
          }
          else //one column of source pixels
          {
            if( oxi == ox1i )
            {
              val = (double)pFrame->pppData[oyi][oxi][c] * (1 - oy + oyi)
                  + (double)pFrame->pppData[oy1i][oxi][c] * (oy1 - oy1i);
              for( y = oyi + 1; y < oy1i; y++ )
                val += (double)pFrame->pppData[y][oxi][c];
              val /= oy1 - oy;
            }
            else //rectangle of source pixels
            {
              val = (double)pFrame->pppData[oyi][oxi][c] * (1 - oy + oyi) * (1 - ox + oxi)
                  + (double)pFrame->pppData[oyi][ox1i][c] * (1 - oy + oyi) * (ox1 - ox1i)
                  + (double)pFrame->pppData[oy1i][oxi][c] * (oy1 - oy1i) * (1 - ox + oxi)
                  + (double)pFrame->pppData[oy1i][ox1i][c] * (oy1 - oy1i) * (ox1 - ox1i);
              for( y = oyi + 1; y < oy1i; y++ )
              {
                val += (double)pFrame->pppData[y][oxi][c] * (1 - ox + oxi)
                     + (double)pFrame->pppData[y][ox1i][c] * (ox1 - ox1i);
              }
              for( x = oxi + 1; x < ox1i; x++ )
              {
                val += (double)pFrame->pppData[oyi][x][c] * (1 - oy + oyi)
                     + (double)pFrame->pppData[oy1i][x][c] * (oy1 - oy1i);
              }
              for( y = oyi + 1; y < oy1i; y++ )
                for( x = oxi + 1; x < ox1i; x++ )
                  val += (double)pFrame->pppData[y][x][c];
              val /= (oy1 - oy) * (ox1 - ox);
            }
          }
          pppData[ny][nx][c] = (unsigned char)(val + 0.5);
        }
      } //for( nx ...
    } //for( ny ...
  } //for( c ...

pFrame->height = height;
  pFrame->width = width;
  free( pFrame->pppData );
  pFrame->pppData = pppData;
}

char * BlinkenFrameToString( stBlinkenFrame * pFrame )
{
  int size, y, x, c;
  char * str, * ptr;
  unsigned long val;

if( pFrame == NULL )
    return NULL;

size = pFrame->height * (pFrame->width + 1) + 32;

str = (char *)malloc( size );
  if( str == NULL )
    return NULL;

ptr = str;
  
  for( y = 0; y < pFrame->height; y++ )
  {
    for( x = 0; x < pFrame->width; x++ )
    {
      val = 0;
      for( val = 0, c = 0; c < pFrame->channels; c++ )
        val += pFrame->pppData[y][x][c];
      val = val * 7 / pFrame->maxval / pFrame->channels;
      *ptr = " -+*%#&@"[val];
      ptr++;
    }
    *ptr = '\n';
    ptr++;
  }

sprintf( ptr, "%u ms\n", pFrame->duration );

return str;
}

BlinkenLib

BlinkenLib v.0.2 (2005-01-27)