SubtitleEdit/libse/BluRaySup/BluRaySupPalette.cs

470 lines
15 KiB
C#

/*
* Copyright 2009 Volker Oth (0xdeadbeef)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* NOTE: Converted to C# and modified by Nikse.dk@gmail.com
*/
namespace Nikse.SubtitleEdit.Core.BluRaySup
{
public class BluRaySupPalette
{
/** Number of palette entries */
private int size;
/** Byte buffer for RED info */
private byte[] r;
/** Byte buffer for GREEN info */
private byte[] g;
/** Byte buffer for BLUE info */
private byte[] b;
/** Byte buffer for alpha info */
private byte[] a;
/** Byte buffer for Y (luminance) info */
private byte[] y;
/** Byte buffer for Cb (chrominance blue) info */
private byte[] cb;
/** Byte buffer for Cr (chrominance red) info */
private byte[] cr;
/** Use BT.601 color model instead of BT.709 */
private bool useBT601;
/**
* Convert YCBCr color info to RGB
* @param y 8 bit luminance
* @param cb 8 bit chrominance blue
* @param cr 8 bit chrominance red
* @return Integer array with red, blue, green component (in this order)
*/
public static int[] YCbCr2Rgb(int y, int cb, int cr, bool useBt601)
{
int[] rgb = new int[3];
double r, g, b;
y -= 16;
cb -= 128;
cr -= 128;
var y1 = y * 1.164383562;
if (useBt601)
{
/* BT.601 for YCbCr 16..235 -> RGB 0..255 (PC) */
r = y1 + cr * 1.596026317;
g = y1 - cr * 0.8129674985 - cb * 0.3917615979;
b = y1 + cb * 2.017232218;
}
else
{
/* BT.709 for YCbCr 16..235 -> RGB 0..255 (PC) */
r = y1 + cr * 1.792741071;
g = y1 - cr * 0.5329093286 - cb * 0.2132486143;
b = y1 + cb * 2.112401786;
}
rgb[0] = (int)(r + 0.5);
rgb[1] = (int)(g + 0.5);
rgb[2] = (int)(b + 0.5);
for (int i = 0; i < 3; i++)
{
if (rgb[i] < 0)
rgb[i] = 0;
else if (rgb[i] > 255)
rgb[i] = 255;
}
return rgb;
}
/**
* Convert RGB color info to YCBCr
* @param r 8 bit red component
* @param g 8 bit green component
* @param b 8 bit blue component
* @return Integer array with luminance (Y), chrominance blue (Cb), chrominance red (Cr) (in this order)
*/
private static int[] Rgb2YCbCr(int r, int g, int b, bool useBt601)
{
int[] yCbCr = new int[3];
double y, cb, cr;
if (useBt601)
{
/* BT.601 for RGB 0..255 (PC) -> YCbCr 16..235 */
y = r * 0.299 * 219 / 255 + g * 0.587 * 219 / 255 + b * 0.114 * 219 / 255;
cb = -r * 0.168736 * 224 / 255 - g * 0.331264 * 224 / 255 + b * 0.5 * 224 / 255;
cr = r * 0.5 * 224 / 255 - g * 0.418688 * 224 / 255 - b * 0.081312 * 224 / 255;
}
else
{
/* BT.709 for RGB 0..255 (PC) -> YCbCr 16..235 */
y = r * 0.2126 * 219 / 255 + g * 0.7152 * 219 / 255 + b * 0.0722 * 219 / 255;
cb = -r * 0.2126 / 1.8556 * 224 / 255 - g * 0.7152 / 1.8556 * 224 / 255 + b * 0.5 * 224 / 255;
cr = r * 0.5 * 224 / 255 - g * 0.7152 / 1.5748 * 224 / 255 - b * 0.0722 / 1.5748 * 224 / 255;
}
yCbCr[0] = 16 + (int)(y + 0.5);
yCbCr[1] = 128 + (int)(cb + 0.5);
yCbCr[2] = 128 + (int)(cr + 0.5);
for (int i = 0; i < 3; i++)
{
if (yCbCr[i] < 16)
yCbCr[i] = 16;
else
{
if (i == 0)
{
if (yCbCr[i] > 235)
yCbCr[i] = 235;
}
else
{
if (yCbCr[i] > 240)
yCbCr[i] = 240;
}
}
}
return yCbCr;
}
/**
* Ctor - initializes palette with transparent black (RGBA: 0x00000000)
* @param palSize Number of palette entries
* @param use601 Use BT.601 instead of BT.709
*/
public BluRaySupPalette(int palSize, bool use601)
{
size = palSize;
useBT601 = use601;
r = new byte[size];
g = new byte[size];
b = new byte[size];
a = new byte[size];
y = new byte[size];
cb = new byte[size];
cr = new byte[size];
// set at least all alpha values to invisible
int[] yCbCr = Rgb2YCbCr(0, 0, 0, useBT601);
for (int i = 0; i < palSize; i++)
{
a[i] = 0;
r[i] = 0;
g[i] = 0;
b[i] = 0;
y[i] = (byte)yCbCr[0];
cb[i] = (byte)yCbCr[1];
cr[i] = (byte)yCbCr[2];
}
}
/**
* Ctor - initializes palette with transparent black (RGBA: 0x00000000)
* @param palSize Number of palette entries
*/
public BluRaySupPalette(int palSize)
: this(palSize, false)
{
}
/**
* Ctor - construct palette from red, green blue and alpha buffers
* @param red Byte buffer containing the red components
* @param green Byte buffer containing the green components
* @param blue Byte buffer containing the blue components
* @param alpha Byte buffer containing the alpha components
* @param use601 Use BT.601 instead of BT.709
*/
public BluRaySupPalette(byte[] red, byte[] green, byte[] blue, byte[] alpha, bool use601)
{
size = red.Length;
useBT601 = use601;
r = new byte[size];
g = new byte[size];
b = new byte[size];
a = new byte[size];
y = new byte[size];
cb = new byte[size];
cr = new byte[size];
for (int i = 0; i < size; i++)
{
a[i] = alpha[i];
r[i] = red[i];
g[i] = green[i];
b[i] = blue[i];
var yCbCr = Rgb2YCbCr(r[i] & 0xff, g[i] & 0xff, b[i] & 0xff, useBT601);
y[i] = (byte)yCbCr[0];
cb[i] = (byte)yCbCr[1];
cr[i] = (byte)yCbCr[2];
}
}
/**
* Ctor - construct palette from red, green blue and alpha buffers
* @param red Byte buffer containing the red components
* @param green Byte buffer containing the green components
* @param blue Byte buffer containing the blue components
* @param alpha Byte buffer containing the alpha components
*/
public BluRaySupPalette(byte[] red, byte[] green, byte[] blue, byte[] alpha)
: this(red, green, blue, alpha, false)
{
}
/**
* Ctor - construct new (independent) palette from existing one
* @param p Palette to copy values from
*/
public BluRaySupPalette(BluRaySupPalette p)
{
size = p.GetSize();
useBT601 = p.UsesBt601();
r = new byte[size];
g = new byte[size];
b = new byte[size];
a = new byte[size];
y = new byte[size];
cb = new byte[size];
cr = new byte[size];
for (int i = 0; i < size; i++)
{
a[i] = p.a[i];
r[i] = p.r[i];
g[i] = p.g[i];
b[i] = p.b[i];
y[i] = p.y[i];
cb[i] = p.cb[i];
cr[i] = p.cr[i];
}
}
/**
* Set palette index "index" to color "c" in ARGB format
* @param index Palette index
* @param c Color in ARGB format
*/
public void SetArgb(int index, int c)
{
int a1 = (c >> 24) & 0xff;
int r1 = (c >> 16) & 0xff;
int g1 = (c >> 8) & 0xff;
int b1 = c & 0xff;
SetRgb(index, r1, g1, b1);
SetAlpha(index, a1);
}
/**
* Return palette entry at index as Integer in ARGB format
* @param index Palette index
* @return Palette entry at index as Integer in ARGB format
*/
public int GetArgb(int index)
{
return ((a[index] & 0xff) << 24) | ((r[index] & 0xff) << 16) | ((g[index] & 0xff) << 8) | (b[index] & 0xff);
}
internal void SetColor(int index, System.Drawing.Color color)
{
SetRgb(index, color.R, color.G, color.B);
SetAlpha(index, color.A);
}
/**
* Set palette entry (RGB mode)
* @param index Palette index
* @param red 8bit red component
* @param green 8bit green component
* @param blue 8bit blue component
*/
public void SetRgb(int index, int red, int green, int blue)
{
r[index] = (byte)red;
g[index] = (byte)green;
b[index] = (byte)blue;
// create yCbCr
int[] yCbCr = Rgb2YCbCr(red, green, blue, useBT601);
y[index] = (byte)yCbCr[0];
cb[index] = (byte)yCbCr[1];
cr[index] = (byte)yCbCr[2];
}
/**
* Set palette entry (YCbCr mode)
* @param index Palette index
* @param yn 8bit Y component
* @param cbn 8bit Cb component
* @param crn 8bit Cr component
*/
public void SetYCbCr(int index, int yn, int cbn, int crn)
{
y[index] = (byte)yn;
cb[index] = (byte)cbn;
cr[index] = (byte)crn;
// create RGB
int[] rgb = YCbCr2Rgb(yn, cbn, crn, useBT601);
r[index] = (byte)rgb[0];
g[index] = (byte)rgb[1];
b[index] = (byte)rgb[2];
}
/**
* Set alpha channel
* @param index Palette index
* @param alpha 8bit alpha channel value
*/
public void SetAlpha(int index, int alpha)
{
a[index] = (byte)alpha;
}
/**
* Get alpha channel
* @param index Palette index
* @return 8bit alpha channel value
*/
public int GetAlpha(int index)
{
return a[index] & 0xff;
}
/**
* Return byte array of alpha channel components
* @return Byte array of alpha channel components (don't modify!)
*/
public byte[] GetAlpha()
{
return a;
}
/**
* Get Integer array containing 8bit red, green, blue components (in this order)
* @param index Palette index
* @return Integer array containing 8bit red, green, blue components (in this order)
*/
public int[] GetRgb(int index)
{
int[] rgb = new int[3];
rgb[0] = r[index] & 0xff;
rgb[1] = g[index] & 0xff;
rgb[2] = b[index] & 0xff;
return rgb;
}
/**
* Get Integer array containing 8bit Y, Cb, Cr components (in this order)
* @param index Palette index
* @return Integer array containing 8bit Y, Cb, Cr components (in this order)
*/
public int[] GetYCbCr(int index)
{
int[] yCbCr = new int[3];
yCbCr[0] = y[index] & 0xff;
yCbCr[1] = cb[index] & 0xff;
yCbCr[2] = cr[index] & 0xff;
return yCbCr;
}
/**
* Return byte array of red components
* @return Byte array of red components (don't modify!)
*/
public byte[] GetR()
{
return r;
}
/**
* Return byte array of green components
* @return Byte array of green components (don't modify!)
*/
public byte[] GetG()
{
return g;
}
/**
* Return byte array of blue components
* @return Byte array of blue components (don't modify!)
*/
public byte[] GetB()
{
return b;
}
/**
* Return byte array of Y components
* @return Byte array of Y components (don't modify!)
*/
public byte[] GetY()
{
return y;
}
/**
* Return byte array of Cb components
* @return Byte array of Cb components (don't modify!)
*/
public byte[] GetCb()
{
return cb;
}
/**
* Return byte array of Cr components
* @return Byte array of Cr components (don't modify!)
*/
public byte[] GetCr()
{
return cr;
}
/**
* Get size of palette (number of entries)
* @return Size of palette (number of entries)
*/
public int GetSize()
{
return size;
}
/**
* Return index of most transparent palette entry or the index of the first completely transparent color
* @return Index of most transparent palette entry or the index of the first completely transparent color
*/
public int GetTransparentIndex()
{
// find (most) transparent index in palette
int transpIdx = 0;
int minAlpha = 0x100;
for (int i = 0; i < size; i++)
{
if ((a[i] & 0xff) < minAlpha)
{
minAlpha = a[i] & 0xff;
transpIdx = i;
if (minAlpha == 0)
break;
}
}
return transpIdx;
}
/**
* Get: use of BT.601 color model instead of BT.709
* @return True if BT.601 is used
*/
public bool UsesBt601()
{
return useBT601;
}
}
}