src/apps/soundrecorder/DrawingTidbits.cpp

   1 /*
   2  * Copyright 2005, Jérôme Duval. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Inspired by SoundCapture from Be newsletter (Media Kit Basics: Consumers
   6  * and Producers)
   7  */
   8
   9 #include <Bitmap.h>
  10 #include <Debug.h>
  11 #include <Screen.h>
  12
  13 #include "DrawingTidbits.h"
  14
  15 rgb_color
  16 ShiftColor(rgb_color color, float percent)
  17 {
  18         rgb_color result = {
  19                 ShiftComponent(color.red, percent),
  20                 ShiftComponent(color.green, percent),
  21                 ShiftComponent(color.blue, percent),
  22                 0
  23         };
  24
  25         return result;
  26 }
  27
  28 static bool
  29 CompareColors(const rgb_color a, const rgb_color b)
  30 {
  31         return a.red == b.red
  32                 && a.green == b.green
  33                 && a.blue == b.blue
  34                 && a.alpha == b.alpha;
  35 }
  36
  37 bool
  38 operator==(const rgb_color &a, const rgb_color &b)
  39 {
  40         return CompareColors(a, b);
  41 }
  42
  43 bool
  44 operator!=(const rgb_color &a, const rgb_color &b)
  45 {
  46         return !CompareColors(a, b);
  47 }
  48
  49 void
  50 ReplaceColor(BBitmap *bitmap, rgb_color from, rgb_color to)
  51 {
  52         ASSERT(bitmap->ColorSpace() == B_CMAP8);
  53         // other color spaces not implemented yet
  54
  55         BScreen screen(B_MAIN_SCREEN_ID);
  56         uint32 fromIndex = screen.IndexForColor(from);
  57         uint32 toIndex = screen.IndexForColor(to);
  58
  59         uchar *bits = (uchar *)bitmap->Bits();
  60         int32 bitsLength = bitmap->BitsLength();
  61         for (int32 index = 0; index < bitsLength; index++)
  62                 if (bits[index] == fromIndex)
  63                         bits[index] = toIndex;
  64 }
  65
  66 void
  67 ReplaceTransparentColor(BBitmap *bitmap, rgb_color with)
  68 {
  69         ASSERT(bitmap->ColorSpace() == B_CMAP8);
  70         // other color spaces not implemented yet
  71
  72         BScreen screen(B_MAIN_SCREEN_ID);
  73         uint8 withIndex = screen.IndexForColor(with);
  74
  75         uchar *bits = (uchar *)bitmap->Bits();
  76         int32 bitsLength = bitmap->BitsLength();
  77         for (int32 index = 0; index < bitsLength; index++)
  78                 if (bits[index] == B_TRANSPARENT_8_BIT)
  79                         bits[index] = withIndex;
  80 }
  81