workbench/libs/cgfx/processpixelarray_opbrightness.c

   1 /*
   2     Copyright © 2013-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <proto/cybergraphics.h>
   7
   8 #include <hidd/graphics.h>
   9 #include <cybergraphx/cybergraphics.h>
  10 #include <exec/types.h>
  11
  12 #include "cybergraphics_intern.h"
  13
  14 //#define DEBUG 1
  15 #include <aros/debug.h>
  16
  17 // function is used for both brighen and darken
  18 void ProcessPixelArrayBrightnessFunc(struct RastPort *opRast, struct Rectangle *opRect, LONG value, struct Library *CyberGfxBase)
  19 {
  20     D(bug("[Cgfx] %s(%d)\n", __PRETTY_FUNCTION__, value));
  21
  22     LONG x, y;
  23     ULONG color;
  24     LONG alpha, red, green, blue;
  25
  26     if (GetBitMapAttr(opRast->BitMap, BMA_DEPTH) < 15)
  27     {
  28         bug("[Cgfx] %s not possible for bitmap depth < 15\n", __PRETTY_FUNCTION__);
  29         return;
  30     }
  31
  32     for(x = opRect->MinX; x <= opRect->MaxX; x++)
  33     {
  34         for (y = opRect->MinY; y <= opRect->MaxY; y++)
  35         {
  36             color = ReadRGBPixel(opRast, x, y);
  37
  38             alpha = (color & 0xff);
  39             red   = (color & 0xff00) >> 8;
  40             green = (color & 0xff0000) >> 16;
  41             blue  = (color & 0xff000000) >> 24;
  42
  43             D(bug("[Cgfx] %s x %d y %d old: alpha %d red %d green %d blue %d", __PRETTY_FUNCTION__, x, y, alpha, red, green, blue));
  44
  45             red += value;
  46             green += value;
  47             blue += value;
  48
  49             if (red > 255)
  50                 red = 255;
  51             else if (red < 0)
  52                 red = 0;
  53             if (green > 255)
  54                 green = 255;
  55             else if (green < 0)
  56                 green = 0;
  57             if (blue > 255)
  58                 blue = 255;
  59             else if (blue < 0)
  60                 blue = 0;
  61
  62             D(bug(" new: alpha %d red %d green %d blue %d\n", alpha, red, green, blue));
  63
  64             color = alpha | (red << 8) | (green << 16) | (blue << 24);
  65
  66             WriteRGBPixel(opRast, x, y, color);
  67         }
  68     }
  69 }