src/add-ons/translators/gif/LoadPalette.cpp

   1 ////////////////////////////////////////////////////////////////////////////////
   2 //
   3 //      File: LoadPalette.cpp
   4 //
   5 //      Date: December 1999
   6 //
   7 //      Author: Daniel Switkin
   8 //
   9 //      Copyright 2003 (c) by Daniel Switkin. This file is made publically available
  10 //      under the BSD license, with the stipulations that this complete header must
  11 //      remain at the top of the file indefinitely, and credit must be given to the
  12 //      original author in any about box using this software.
  13 //
  14 ////////////////////////////////////////////////////////////////////////////////
  15
  16 // Additional authors:  John Scipione, <jscipione@gmail.com>
  17
  18
  19 #include "LoadPalette.h"
  20
  21 #include <GraphicsDefs.h>
  22 #include <ByteOrder.h>
  23
  24
  25 LoadPalette::LoadPalette() {
  26         backgroundindex = 0;
  27         usetransparent = false;
  28         transparentindex = 0;
  29         size = size_in_bits = 0;
  30 }
  31
  32
  33 uint32
  34 LoadPalette::ColorForIndex(int index)
  35 {
  36         // never index into pal directly - this function is safe
  37         if (index >= 0 && index <= size) {
  38                 if (usetransparent && index == transparentindex)
  39                         return B_TRANSPARENT_MAGIC_RGBA32;
  40                 else
  41                         return data[index];
  42         } else
  43                 return B_BENDIAN_TO_HOST_INT32(0x000000ff);
  44 }
  45
  46
  47 void
  48 LoadPalette::SetColor(int index, uint8 red, uint8 green, uint8 blue)
  49 {
  50         if (index < 0 || index > 255)
  51                 return;
  52
  53         data[index] = (blue << 24) + (green << 16) + (red << 8) + 0xff;
  54         data[index] = B_BENDIAN_TO_HOST_INT32(data[index]);
  55 }