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     LONG width, height;
  26     ULONG * buffer, *ptr;
  27
  28     if (GetBitMapAttr(opRast->BitMap, BMA_DEPTH) < 15)
  29     {
  30         bug("[Cgfx] %s not possible for bitmap depth < 15\n", __PRETTY_FUNCTION__);
  31         return;
  32     }
  33
  34     width  = opRect->MaxX - opRect->MinX + 1;
  35     height = opRect->MaxY - opRect->MinY + 1;
  36
  37     ptr = buffer = AllocMem(width * height * 4, MEMF_ANY);
  38     ReadPixelArray(buffer, 0, 0, width * 4, opRast, opRect->MinX, opRect->MinY, width, height, RECTFMT_ARGB);
  39
  40     for (y = 0; y < height; y++)
  41     {
  42         for(x = 0; x < width; x++)
  43         {
  44             color = *ptr;
  45
  46             alpha = (color & 0xff);
  47             red   = (color & 0xff00) >> 8;
  48             green = (color & 0xff0000) >> 16;
  49             blue  = (color & 0xff000000) >> 24;
  50
  51             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));
  52
  53             red += value;
  54             green += value;
  55             blue += value;
  56
  57             if (red > 255)
  58                 red = 255;
  59             else if (red < 0)
  60                 red = 0;
  61             if (green > 255)
  62                 green = 255;
  63             else if (green < 0)
  64                 green = 0;
  65             if (blue > 255)
  66                 blue = 255;
  67             else if (blue < 0)
  68                 blue = 0;
  69
  70             D(bug(" new: alpha %d red %d green %d blue %d\n", alpha, red, green, blue));
  71
  72             color = alpha | (red << 8) | (green << 16) | (blue << 24);
  73
  74             *ptr = color;
  75             ptr++;
  76         }
  77     }
  78
  79     WritePixelArray(buffer, 0, 0, width * 4, opRast, opRect->MinX, opRect->MinY, width, height, RECTFMT_ARGB);
  80     FreeMem(buffer, width * height * 4);
  81 }