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-rw-r--r--mpeglib/lib/util/render/dither/dither8Bit.cpp306
1 files changed, 306 insertions, 0 deletions
diff --git a/mpeglib/lib/util/render/dither/dither8Bit.cpp b/mpeglib/lib/util/render/dither/dither8Bit.cpp
new file mode 100644
index 00000000..4f85d3fb
--- /dev/null
+++ b/mpeglib/lib/util/render/dither/dither8Bit.cpp
@@ -0,0 +1,306 @@
+/*
+ dither 8 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 "dither8Bit.h"
+
+
+Dither8Bit::Dither8Bit(unsigned char pixel[256]) {
+
+ int i;
+ for(i=0;i<256;i++) {
+ this->pixel[i]=pixel[i];
+ }
+ colorTable8Bit=new ColorTable8Bit();
+
+ lum_values = colorTable8Bit->getLumValues();
+ cr_values = colorTable8Bit->getCrValues();
+ cb_values = colorTable8Bit->getCbValues();
+
+
+
+ initOrderedDither();
+
+}
+
+
+Dither8Bit::~Dither8Bit() {
+ int i;
+ for (i=0; i<DITH_SIZE; i++) {
+ delete cb_darrays[i];
+ delete l_darrays[i];
+ delete cr_darrays[i];
+ }
+}
+
+
+
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * InitOrderedDither--
+ *
+ * Structures initialized for ordered dithering.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *--------------------------------------------------------------
+ */
+void Dither8Bit::initOrderedDither() {
+ int i, j, k, err_range, threshval;
+ unsigned char *lmark, *cmark;
+
+ for (i=0; i<DITH_SIZE; i++) {
+ lmark = l_darrays[i] = new unsigned char[256];
+ for (j=0; j<lum_values[0]; j++) {
+ *lmark++ = 0;
+ }
+ for (j=0; j<(LUM_RANGE-1); j++) {
+ err_range = lum_values[j+1] - lum_values[j];
+ threshval = ((i * err_range) / DITH_SIZE)+lum_values[j];
+
+ for (k=lum_values[j]; k<lum_values[j+1]; k++) {
+ if (k > threshval) {
+ *lmark++ = ((j+1) * (CR_RANGE * CB_RANGE));
+ }
+ else {
+ *lmark++ = (j * (CR_RANGE * CB_RANGE));
+ }
+ }
+ }
+ for (j=lum_values[LUM_RANGE-1]; j<256; j++) {
+ *lmark++ = (LUM_RANGE-1)*(CR_RANGE * CB_RANGE);
+ }
+ }
+ for (i=0; i<DITH_SIZE; i++) {
+ cmark = cr_darrays[i] = new unsigned char[256];
+
+ for (j=0; j<cr_values[0]; j++) {
+ *cmark++ = 0;
+ }
+
+ for (j=0; j<(CR_RANGE-1); j++) {
+ err_range = cr_values[j+1] - cr_values[j];
+ threshval = ((i * err_range) / DITH_SIZE)+cr_values[j];
+
+ for (k=cr_values[j]; k<cr_values[j+1]; k++) {
+ if (k > threshval) {
+ *cmark++ = ((j+1) * CB_RANGE);
+ }
+ else {
+ *cmark++ = (j * CB_RANGE);
+ }
+ }
+ }
+
+ for (j=cr_values[CR_RANGE-1]; j<256; j++) {
+ *cmark++ = (CR_RANGE-1)*(CB_RANGE);
+ }
+ }
+
+ for (i=0; i<DITH_SIZE; i++) {
+ cmark = cb_darrays[i] = new unsigned char[256];
+
+ for (j=0; j<cb_values[0]; j++) {
+ *cmark++ = 0;
+ }
+
+ for (j=0; j<(CB_RANGE-1); j++) {
+ err_range = cb_values[j+1] - cb_values[j];
+ threshval = ((i * err_range) / DITH_SIZE)+cb_values[j];
+
+ for (k=cb_values[j]; k<cb_values[j+1]; k++) {
+ if (k > threshval) {
+ *cmark++ = j+1;
+ }
+ else {
+ *cmark++ = j;
+ }
+ }
+ }
+
+ for (j=cb_values[CB_RANGE-1]; j<256; j++) {
+ *cmark++ = CB_RANGE-1;
+ }
+ }
+}
+
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * OrderedDitherImage --
+ *
+ * Dithers an image using an ordered dither.
+ * Assumptions made:
+ * 1) The color space is allocated y:cr:cb = 8:4:4
+ * 2) The spatial resolution of y:cr:cb is 4:1:1
+ * The channels are dithered based on the standard
+ * ordered dither pattern for a 4x4 area.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *--------------------------------------------------------------
+ */
+
+void Dither8Bit::ditherImageOrdered (unsigned char* lum,
+ unsigned char* cr,
+ unsigned char* cb,
+ unsigned char* out,
+ int h,
+ int w) {
+ unsigned char *l, *r, *b, *o1, *o2;
+ unsigned char *l2;
+ unsigned char L, R, B;
+ int i, j;
+
+ l = lum;
+ l2 = lum+w;
+ r = cr;
+ b = cb;
+ o1 = out;
+ o2 = out+w;
+
+
+ for (i=0; i<h; i+=4) {
+
+ for (j=0; j<w; j+=8) {
+
+ R = r[0]; B = b[0];
+
+ L = l[0];
+ o1[0] = pixel[(l_darrays[0][L] + cr_darrays[0][R] + cb_darrays[0][B])];
+ L = l[1];
+ o1[1] = pixel[(l_darrays[8][L] + cr_darrays[8][R] + cb_darrays[8][B])];
+ L = l2[0];
+ o2[0] = pixel[(l_darrays[12][L] + cr_darrays[12][R] + cb_darrays[12][B])];
+ L = l2[1];
+ o2[1] = pixel[(l_darrays[4][L] + cr_darrays[4][R] + cb_darrays[4][B])];
+
+ R = r[1]; B = b[1];
+
+ L = l[2];
+ o1[2] = pixel[(l_darrays[2][L] + cr_darrays[2][R] + cb_darrays[2][B])];
+ L = l[3];
+ o1[3] = pixel[(l_darrays[10][L] + cr_darrays[10][R] + cb_darrays[10][B])];
+ L = l2[2];
+ o2[2] = pixel[(l_darrays[14][L] + cr_darrays[14][R] + cb_darrays[14][B])];
+ L = l2[3];
+ o2[3] = pixel[(l_darrays[6][L] + cr_darrays[6][R] + cb_darrays[6][B])];
+
+ R = r[2]; B = b[2];
+
+ L = l[4];
+ o1[4] = pixel[(l_darrays[0][L] + cr_darrays[0][R] + cb_darrays[0][B])];
+ L = l[5];
+ o1[5] = pixel[(l_darrays[8][L] + cr_darrays[8][R] + cb_darrays[8][B])];
+ L = l2[4];
+ o2[4] = pixel[(l_darrays[12][L] + cr_darrays[12][R] + cb_darrays[12][B])];
+ L = l2[5];
+ o2[5] = pixel[(l_darrays[4][L] + cr_darrays[4][R] + cb_darrays[4][B])];
+
+ R = r[3]; B = b[3];
+
+ L = l[6];
+ o1[6] = pixel[(l_darrays[2][L] + cr_darrays[2][R] + cb_darrays[2][B])];
+ L = l[7];
+ o1[7] = pixel[(l_darrays[10][L] + cr_darrays[10][R] + cb_darrays[10][B])];
+ L = l2[6];
+ o2[6] = pixel[(l_darrays[14][L] + cr_darrays[14][R] + cb_darrays[14][B])];
+ L = l2[7];
+ o2[7] = pixel[(l_darrays[6][L] + cr_darrays[6][R] + cb_darrays[6][B])];
+
+ l += 8;
+ l2 += 8;
+ r += 4;
+ b += 4;
+ o1 += 8;
+ o2 += 8;
+ }
+
+ l += w;
+ l2 += w;
+ o1 += w;
+ o2 += w;
+
+ for (j=0; j<w; j+=8) {
+
+ R = r[0]; B = b[0];
+
+ L = l[0];
+ o1[0] = pixel[(l_darrays[3][L] + cr_darrays[3][R] + cb_darrays[3][B])];
+ L = l[1];
+ o1[1] = pixel[(l_darrays[11][L] + cr_darrays[11][R] + cb_darrays[11][B])];
+ L = l2[0];
+ o2[0] = pixel[(l_darrays[15][L] + cr_darrays[15][R] + cb_darrays[15][B])];
+ L = l2[1];
+ o2[1] = pixel[(l_darrays[7][L] + cr_darrays[7][R] + cb_darrays[7][B])];
+
+ R = r[1]; B = b[1];
+
+ L = l[2];
+ o1[2] = pixel[(l_darrays[1][L] + cr_darrays[1][R] + cb_darrays[1][B])];
+ L = l[3];
+ o1[3] = pixel[(l_darrays[9][L] + cr_darrays[9][R] + cb_darrays[9][B])];
+ L = l2[2];
+ o2[2] = pixel[(l_darrays[13][L] + cr_darrays[13][R] + cb_darrays[13][B])];
+ L = l2[3];
+ o2[3] = pixel[(l_darrays[5][L] + cr_darrays[5][R] + cb_darrays[5][B])];
+
+ R = r[2]; B = b[2];
+
+ L = l[4];
+ o1[4] = pixel[(l_darrays[3][L] + cr_darrays[3][R] + cb_darrays[3][B])];
+ L = l[5];
+ o1[5] = pixel[(l_darrays[11][L] + cr_darrays[11][R] + cb_darrays[11][B])];
+ L = l2[4];
+ o2[4] = pixel[(l_darrays[15][L] + cr_darrays[15][R] + cb_darrays[15][B])];
+ L = l2[5];
+ o2[5] = pixel[(l_darrays[7][L] + cr_darrays[7][R] + cb_darrays[7][B])];
+
+ R = r[3]; B = b[3];
+
+ L = l[6];
+ o1[6] = pixel[(l_darrays[1][L] + cr_darrays[1][R] + cb_darrays[1][B])];
+ L = l[7];
+ o1[7] = pixel[(l_darrays[9][L] + cr_darrays[9][R] + cb_darrays[9][B])];
+ L = l2[6];
+ o2[6] = pixel[(l_darrays[13][L] + cr_darrays[13][R] + cb_darrays[13][B])];
+ L = l2[7];
+ o2[7] = pixel[(l_darrays[5][L] + cr_darrays[5][R] + cb_darrays[5][B])];
+
+ l += 8;
+ l2 += 8;
+ r += 4;
+ b += 4;
+ o1 += 8;
+ o2 += 8;
+ }
+
+ l += w;
+ l2 += w;
+ o1 += w;
+ o2 += w;
+ }
+}
+
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