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Fix & rename 16-bit routines to 15-bit

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Add real 16-bit routines


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4987 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
shadow303 2003-10-10 20:37:32 +00:00
parent 37c324a741
commit 16ce773582
1 changed files with 77 additions and 16 deletions
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93
src/kits/interface/ColorUtils.cc
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@ -28,15 +28,27 @@
/*!
\brief An approximation of 31/255, which is needed for converting from 32-bit
colors to 16-bit and 15-bit.
*/
#define RATIO_8_TO_5_BIT .121568627451
/*!
\brief An approximation of 63/255, which is needed for converting from 32-bit
colors to 16-bit.
*/
#define RATIO_32_TO_16_BIT .121568627451
#define RATIO_8_TO_6_BIT .247058823529
/*!
\brief An approximation of 255/31, which is needed for converting from 16-bit
and 15-bit colors to 32-bit.
*/
#define RATIO_5_TO_8_BIT 8.22580645161
/*!
\brief An approximation of 255/63, which is needed for converting from 16-bit
colors to 32-bit.
*/
#define RATIO_16_TO_32_BIT 8.225806451613
#define RATIO_6_TO_8_BIT 4.04761904762
/*!
\brief Function for easy assignment of values to rgb_color objects
@ -60,13 +72,13 @@ void SetRGBColor(rgb_color *col,uint8 r, uint8 g, uint8 b, uint8 a)
}
/*!
\brief Function for easy conversion of 16-bit colors to 32-bit
\brief Function for easy conversion of 15-bit colors to 32-bit
\param col Pointer to an rgb_color.
\param color RGBA16 color
This function will do nothing if passed a NULL 32-bit color.
*/
void SetRGBColor(rgb_color *col,uint16 color)
void SetRGBColor15(rgb_color *col,uint16 color)
{
if(!col)
return;
@ -76,13 +88,39 @@ void SetRGBColor(rgb_color *col,uint16 color)
// alpha's the easy part
col->alpha=(color & 0x8000)?255:0;
r16= (color >> 15) & 31;
g16= (color >> 10) & 31;
r16= (color >> 10) & 31;
g16= (color >> 5) & 31;
b16= color & 31;
col->red=uint8(r16 * RATIO_16_TO_32_BIT);
col->green=uint8(g16 * RATIO_16_TO_32_BIT);
col->blue=uint8(b16 * RATIO_16_TO_32_BIT);
col->red=uint8(r16 * RATIO_5_TO_8_BIT);
col->green=uint8(g16 * RATIO_5_TO_8_BIT);
col->blue=uint8(b16 * RATIO_5_TO_8_BIT);
}
/*!
\brief Function for easy conversion of 16-bit colors to 32-bit
\param col Pointer to an rgb_color.
\param color RGB16 color
This function will do nothing if passed a NULL 32-bit color.
*/
void SetRGBColor16(rgb_color *col,uint16 color)
{
if(!col)
return;
uint16 r16,g16,b16;
// alpha's the easy part
col->alpha=0;
r16= (color >> 11) & 31;
g16= (color >> 5) & 63;
b16= color & 31;
col->red=uint8(r16 * RATIO_5_TO_8_BIT);
col->green=uint8(g16 * RATIO_6_TO_8_BIT);
col->blue=uint8(b16 * RATIO_5_TO_8_BIT);
}
/*!
@ -150,20 +188,43 @@ uint8 FindClosestColor(rgb_color *palette, rgb_color color)
Format is ARGB, 1:5:5:5
*/
uint16 FindClosestColor16(rgb_color color)
uint16 FindClosestColor15(rgb_color color)
{
uint16 r16,g16,b16;
uint16 color16;
uint16 color16=0;
r16=uint16(color.red * RATIO_32_TO_16_BIT);
g16=uint16(color.green * RATIO_32_TO_16_BIT);
b16=uint16(color.blue * RATIO_32_TO_16_BIT);
r16=uint16(color.red * RATIO_8_TO_5_BIT);
g16=uint16(color.green * RATIO_8_TO_5_BIT);
b16=uint16(color.blue * RATIO_8_TO_5_BIT);
// start with alpha value
color16=(color.alpha>127)?0x8000:0;
color16 |= r16 << 15;
color16 |= g16 << 10;
color16 |= r16 << 10;
color16 |= g16 << 5;
color16 |= b16;
return color16;
}
/*!
\brief Constructs a RGB16 color which best matches a given 32-bit color
\param color Color to match
\return The closest matching color's value
Format is RGB, 5:6:5
*/
uint16 FindClosestColor16(rgb_color color)
{
uint16 r16,g16,b16;
uint16 color16=0;
r16=uint16(color.red * RATIO_8_TO_5_BIT);
g16=uint16(color.green * RATIO_8_TO_6_BIT);
b16=uint16(color.blue * RATIO_8_TO_5_BIT);
color16 |= r16 << 11;
color16 |= g16 << 5;
color16 |= b16;
return color16;