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-rw-r--r--mpeglib/lib/util/render/dither/dither16Bit.cpp300
1 files changed, 300 insertions, 0 deletions
diff --git a/mpeglib/lib/util/render/dither/dither16Bit.cpp b/mpeglib/lib/util/render/dither/dither16Bit.cpp
new file mode 100644
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--- /dev/null
+++ b/mpeglib/lib/util/render/dither/dither16Bit.cpp
@@ -0,0 +1,300 @@
+/*
+ dither 16 bit depth yuv images
+ Copyright (C) 2000 Martin Vogt
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Library General Public License as published by
+ the Free Software Foundation.
+
+ For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#include "dither16Bit.h"
+
+
+Dither16Bit::Dither16Bit(unsigned int redMask,
+ unsigned int greenMask,unsigned int blueMask) {
+
+
+ colorTableHighBit=new ColorTableHighBit(16,redMask,greenMask,blueMask);
+ L_tab=colorTableHighBit->getL_tab();
+ Cr_r_tab=colorTableHighBit->getCr_r_tab();
+ Cr_g_tab=colorTableHighBit->getCr_g_tab();
+ Cb_g_tab=colorTableHighBit->getCb_g_tab();
+ Cb_b_tab=colorTableHighBit->getCb_b_tab();
+
+ r_2_pix=colorTableHighBit->getr_2_pix();
+ g_2_pix=colorTableHighBit->getg_2_pix();
+ b_2_pix=colorTableHighBit->getb_2_pix();
+
+}
+
+
+Dither16Bit::~Dither16Bit() {
+ delete colorTableHighBit;
+}
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Color16DitherImage --
+ *
+ * Converts image into 16 bit color.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *--------------------------------------------------------------
+ */
+
+void Dither16Bit::ditherImageColor16(unsigned char* lum,
+ unsigned char* cr,
+ unsigned char* cb,
+ unsigned char* out,
+ int rows,
+ int cols,
+ int offset) {
+
+ int L, CR, CB;
+ unsigned short *row1, *row2;
+ unsigned char *lum2;
+ int x, y;
+ int cr_r;
+ int cr_g;
+ int cb_g;
+ int cb_b;
+ int cols_2 = cols/2;
+
+ row1 = (unsigned short *)out;
+ row2=row1+cols_2+cols_2+offset; // start of second row
+
+ offset=2*offset+cols_2+cols_2;
+
+ lum2 = lum + cols_2 + cols_2;
+
+
+ for (y=0; y<rows; y+=2) {
+ for (x=0; x<cols_2; x++) {
+ int R, G, B;
+
+ CR = *cr++;
+ CB = *cb++;
+ cr_r = Cr_r_tab[CR];
+ cr_g = Cr_g_tab[CR];
+ cb_g = Cb_g_tab[CB];
+ cb_b = Cb_b_tab[CB];
+
+ L = L_tab[(int) *lum++];
+
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ *row1++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+
+
+#ifdef INTERPOLATE
+ if(x != cols_2 - 1) {
+ CR = (CR + *cr) >> 1;
+ CB = (CB + *cb) >> 1;
+ cr_r = Cr_r_tab[CR];
+ cr_g = Cr_g_tab[CR];
+ cb_g = Cb_g_tab[CB];
+ cb_b = Cb_b_tab[CB];
+ }
+#endif
+
+ L = L_tab[(int) *lum++];
+
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ *row1++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+
+ /*
+ * Now, do second row.
+ */
+#ifdef INTERPOLATE
+ if(y != rows - 2) {
+ CR = (CR + *(cr + cols_2 - 1)) >> 1;
+ CB = (CB + *(cb + cols_2 - 1)) >> 1;
+ cr_r = Cr_r_tab[CR];
+ cr_g = Cr_g_tab[CR];
+ cb_g = Cb_g_tab[CB];
+ cb_b = Cb_b_tab[CB];
+ }
+#endif
+
+ L = L_tab[(int) *lum2++];
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ *row2++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+
+ L = L_tab[(int) *lum2++];
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ *row2++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+ }
+ /*
+ * These values are at the start of the next line, (due
+ * to the ++'s above),but they need to be at the start
+ * of the line after that.
+ */
+ lum += cols_2 + cols_2;
+ lum2 += cols_2 + cols_2;
+ row1 += offset;
+ row2 += offset;
+ }
+}
+
+
+/*
+ * Erik Corry's pixel doubling routines for 15/16/24/32 bit screens.
+ */
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Twox2Color16DitherImage --
+ *
+ * Converts image into 16 bit color at double size.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *--------------------------------------------------------------
+ */
+
+/*
+ * In this function I make use of a nasty trick. The tables have the lower
+ * 16 bits replicated in the upper 16. This means I can write ints and get
+ * the horisontal doubling for free (almost).
+ */
+
+void Dither16Bit::ditherImageTwox2Color16(unsigned char* lum,
+ unsigned char* cr,
+ unsigned char* cb,
+ unsigned char* out,
+ int rows,
+ int cols,
+ int mod) {
+ int L, CR, CB;
+ unsigned int *row1 = (unsigned int *)out;
+ unsigned int *row2 = row1 + cols + mod/2;
+ unsigned int *row3 = row2 + cols + mod/2;
+ unsigned int *row4 = row3 + cols + mod/2;
+ unsigned char *lum2;
+ int x, y;
+ int cr_r;
+ int cr_g;
+ int cb_g;
+ int cb_b;
+ int cols_2 = cols/2;
+
+ lum2 = lum + cols_2 + cols_2;
+ for (y=0; y<rows; y+=2) {
+ for (x=0; x<cols_2; x++) {
+ int R, G, B;
+ int t;
+
+ CR = *cr++;
+ CB = *cb++;
+ cr_r = Cr_r_tab[CR];
+ cr_g = Cr_g_tab[CR];
+ cb_g = Cb_g_tab[CB];
+ cb_b = Cb_b_tab[CB];
+
+ L = L_tab[(int) *lum++];
+
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+ row1[0] = t;
+ row1++;
+ row2[0] = t;
+ row2++;
+
+ // INTERPOLATE
+ if(x != cols_2 - 1) {
+ CR = (CR + *cr) >> 1;
+ CB = (CB + *cb) >> 1;
+ cr_r = Cr_r_tab[CR];
+ cr_g = Cr_g_tab[CR];
+ cb_g = Cb_g_tab[CB];
+ cb_b = Cb_b_tab[CB];
+ }
+ // end
+
+ L = L_tab[(int) *lum++];
+
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+ row1[0] = t;
+ row1++;
+ row2[0] = t;
+ row2++;
+
+ /*
+ * Now, do second row.
+ */
+ // INTERPOLATE
+ if(y != rows - 2) {
+ CR = (CR + *(cr + cols_2 - 1)) >> 1;
+ CB = (CB + *(cb + cols_2 - 1)) >> 1;
+ cr_r = Cr_r_tab[CR];
+ cr_g = Cr_g_tab[CR];
+ cb_g = Cb_g_tab[CB];
+ cb_b = Cb_b_tab[CB];
+ }
+ // end
+
+ L = L_tab[(int) *lum2++];
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+ row3[0] = t;
+ row3++;
+ row4[0] = t;
+ row4++;
+
+ L = L_tab[(int) *lum2++];
+ R = L + cr_r;
+ G = L + cr_g + cb_g;
+ B = L + cb_b;
+
+ t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
+ row3[0] = t;
+ row3++;
+ row4[0] = t;
+ row4++;
+ }
+ lum += cols_2 + cols_2;
+ lum2 += cols_2 + cols_2;
+ row1 += 6 * cols_2 + 2*mod;
+ row3 += 6 * cols_2 + 2*mod;
+ row2 += 6 * cols_2 + 2*mod;
+ row4 += 6 * cols_2 + 2*mod;
+ }
+}
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