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370 lines
9.6 KiB
C++
370 lines
9.6 KiB
C++
/*************************************************************************/
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/* image_quantize.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "image.h"
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#include <stdio.h>
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#include "print_string.h"
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#ifdef TOOLS_ENABLED
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#include "set.h"
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#include "sort.h"
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#include "os/os.h"
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//#define QUANTIZE_SPEED_OVER_QUALITY
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Image::MCBlock::MCBlock() {
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}
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Image::MCBlock::MCBlock(BColorPos *p_colors,int p_color_count) {
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colors=p_colors;
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color_count=p_color_count;
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min_color.color=BColor(255,255,255,255);
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max_color.color=BColor(0,0,0,0);
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shrink();
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}
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int Image::MCBlock::get_longest_axis_index() const {
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int max_dist=-1;
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int max_index=0;
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for(int i=0;i<4;i++) {
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int d = max_color.color.col[i]-min_color.color.col[i];
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//printf(" ai:%i - %i\n",i,d);
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if (d>max_dist) {
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max_index=i;
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max_dist=d;
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}
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}
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return max_index;
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}
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int Image::MCBlock::get_longest_axis_length() const {
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int max_dist=-1;
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int max_index=0;
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for(int i=0;i<4;i++) {
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int d = max_color.color.col[i]-min_color.color.col[i];
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if (d>max_dist) {
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max_index=i;
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max_dist=d;
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}
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}
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return max_dist;
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}
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bool Image::MCBlock::operator<(const MCBlock& p_block) const {
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int alen = get_longest_axis_length();
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int blen = p_block.get_longest_axis_length();
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if (alen==blen) {
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return colors < p_block.colors;
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} else
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return alen < blen;
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}
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void Image::MCBlock::shrink() {
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min_color=colors[0];
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max_color=colors[0];
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for(int i=1;i<color_count;i++) {
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for(int j=0;j<4;j++) {
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min_color.color.col[j]=MIN(min_color.color.col[j],colors[i].color.col[j]);
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max_color.color.col[j]=MAX(max_color.color.col[j],colors[i].color.col[j]);
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}
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}
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}
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void Image::quantize() {
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Image::Format orig_format=format;
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bool has_alpha = detect_alpha()!=ALPHA_NONE;
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bool quantize_fast=OS::get_singleton()->has_environment("QUANTIZE_FAST");
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convert(FORMAT_RGBA);
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ERR_FAIL_COND( format!=FORMAT_RGBA );
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DVector<uint8_t> indexed_data;
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{
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int color_count = data.size()/4;
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ERR_FAIL_COND(color_count==0);
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Set<MCBlock> block_queue;
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DVector<BColorPos> data_colors;
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data_colors.resize(color_count);
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DVector<BColorPos>::Write dcw=data_colors.write();
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DVector<uint8_t>::Read dr = data.read();
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const BColor * drptr=(const BColor*)&dr[0];
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BColorPos *bcptr=&dcw[0];
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{
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for(int i=0;i<color_count;i++) {
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//uint32_t data_ofs=i<<2;
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bcptr[i].color=drptr[i];//BColor(drptr[data_ofs+0],drptr[data_ofs+1],drptr[data_ofs+2],drptr[data_ofs+3]);
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bcptr[i].index=i;
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}
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}
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//printf("color count: %i\n",color_count);
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/*
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for(int i=0;i<color_count;i++) {
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BColor bc = ((BColor*)&wb[0])[i];
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printf("%i - %i,%i,%i,%i\n",i,bc.r,bc.g,bc.b,bc.a);
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}*/
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MCBlock initial_block((BColorPos*)&dcw[0],color_count);
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block_queue.insert(initial_block);
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while( block_queue.size() < 256 && block_queue.back()->get().color_count > 1 ) {
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MCBlock longest = block_queue.back()->get();
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//printf("longest: %i (%i)\n",longest.get_longest_axis_index(),longest.get_longest_axis_length());
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block_queue.erase(block_queue.back());
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BColorPos *first = longest.colors;
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BColorPos *median = longest.colors + (longest.color_count+1)/2;
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BColorPos *end = longest.colors + longest.color_count;
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#if 0
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int lai =longest.get_longest_axis_index();
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switch(lai) {
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#if 0
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case 0: { SortArray<BColorPos,BColorPos::SortR> sort; sort.sort(first,end-first); } break;
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case 1: { SortArray<BColorPos,BColorPos::SortG> sort; sort.sort(first,end-first); } break;
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case 2: { SortArray<BColorPos,BColorPos::SortB> sort; sort.sort(first,end-first); } break;
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case 3: { SortArray<BColorPos,BColorPos::SortA> sort; sort.sort(first,end-first); } break;
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#else
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case 0: { SortArray<BColorPos,BColorPos::SortR> sort; sort.nth_element(0,end-first,median-first,first); } break;
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case 1: { SortArray<BColorPos,BColorPos::SortG> sort; sort.nth_element(0,end-first,median-first,first); } break;
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case 2: { SortArray<BColorPos,BColorPos::SortB> sort; sort.nth_element(0,end-first,median-first,first); } break;
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case 3: { SortArray<BColorPos,BColorPos::SortA> sort; sort.nth_element(0,end-first,median-first,first); } break;
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#endif
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}
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//avoid same color from being split in 2
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//search forward and flip
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BColorPos *median_end=median;
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BColorPos *p=median_end+1;
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while(p!=end) {
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if (median_end->color==p->color) {
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SWAP(*(median_end+1),*p);
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median_end++;
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}
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p++;
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}
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//search backward and flip
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BColorPos *median_begin=median;
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p=median_begin-1;
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while(p!=(first-1)) {
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if (median_begin->color==p->color) {
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SWAP(*(median_begin-1),*p);
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median_begin--;
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}
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p--;
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}
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if (first < median_begin) {
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median=median_begin;
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} else if (median_end < end-1) {
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median=median_end+1;
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} else {
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break; //shouldn't have arrived here, since it means all pixels are equal, but wathever
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}
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MCBlock left(first,median-first);
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MCBlock right(median,end-median);
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block_queue.insert(left);
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block_queue.insert(right);
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#else
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switch(longest.get_longest_axis_index()) {
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case 0: { SortArray<BColorPos,BColorPos::SortR> sort; sort.nth_element(0,end-first,median-first,first); } break;
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case 1: { SortArray<BColorPos,BColorPos::SortG> sort; sort.nth_element(0,end-first,median-first,first); } break;
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case 2: { SortArray<BColorPos,BColorPos::SortB> sort; sort.nth_element(0,end-first,median-first,first); } break;
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case 3: { SortArray<BColorPos,BColorPos::SortA> sort; sort.nth_element(0,end-first,median-first,first); } break;
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}
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MCBlock left(first,median-first);
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MCBlock right(median,end-median);
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block_queue.insert(left);
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block_queue.insert(right);
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#endif
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}
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while(block_queue.size() > 256) {
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block_queue.erase(block_queue.front());// erase least significant
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}
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int res_colors=0;
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int comp_size = (has_alpha?4:3);
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indexed_data.resize(color_count + 256*comp_size);
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DVector<uint8_t>::Write iw = indexed_data.write();
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uint8_t *iwptr=&iw[0];
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BColor pallete[256];
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// print_line("applying quantization - res colors "+itos(block_queue.size()));
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while(block_queue.size()) {
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const MCBlock &b = block_queue.back()->get();
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uint64_t sum[4]={0,0,0,0};
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for(int i=0;i<b.color_count;i++) {
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sum[0]+=b.colors[i].color.col[0];
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sum[1]+=b.colors[i].color.col[1];
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sum[2]+=b.colors[i].color.col[2];
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sum[3]+=b.colors[i].color.col[3];
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}
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BColor c( sum[0]/b.color_count, sum[1]/b.color_count, sum[2]/b.color_count, sum[3]/b.color_count );
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//printf(" %i: %i,%i,%i,%i out of %i\n",res_colors,c.r,c.g,c.b,c.a,b.color_count);
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for(int i=0;i<comp_size;i++) {
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iwptr[ color_count + res_colors * comp_size + i ] = c.col[i];
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}
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if (quantize_fast) {
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for(int i=0;i<b.color_count;i++) {
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iwptr[b.colors[i].index]=res_colors;
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}
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} else {
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pallete[res_colors]=c;
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}
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res_colors++;
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block_queue.erase(block_queue.back());
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}
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if (!quantize_fast) {
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for(int i=0;i<color_count;i++) {
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const BColor &c=drptr[i];
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uint8_t best_dist_idx=0;
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uint32_t dist=0xFFFFFFFF;
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for(int j=0;j<res_colors;j++) {
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const BColor &pc=pallete[j];
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uint32_t d = 0;
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{ int16_t v = (int16_t)c.r-(int16_t)pc.r; d+=v*v; }
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{ int16_t v = (int16_t)c.g-(int16_t)pc.g; d+=v*v; }
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{ int16_t v = (int16_t)c.b-(int16_t)pc.b; d+=v*v; }
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{ int16_t v = (int16_t)c.a-(int16_t)pc.a; d+=v*v; }
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if (d<=dist) {
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best_dist_idx=j;
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dist=d;
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}
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}
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iwptr[ i ] = best_dist_idx;
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}
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}
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//iw = DVector<uint8_t>::Write();
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//dr = DVector<uint8_t>::Read();
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//wb = DVector<uint8_t>::Write();
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}
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print_line(itos(indexed_data.size()));
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data=indexed_data;
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format=has_alpha?FORMAT_INDEXED_ALPHA:FORMAT_INDEXED;
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} //do none
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#else
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void Image::quantize() {} //do none
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#endif
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