109 lines
3 KiB
C++
109 lines
3 KiB
C++
#include "CanvasPictureWriter.h"
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#include <cassert>
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#include "Canvas.h"
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#include "CanvasPortion.h"
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#include "ColorProfile.h"
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#include "PackStream.h"
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CanvasPictureWriter::CanvasPictureWriter(const Canvas *canvas) : canvas(canvas) {
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profile = new ColorProfile();
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antialias = 1;
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width = canvas->getWidth();
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height = canvas->getHeight();
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cache = new Color[1];
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cache_y = -antialias;
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cache_width = 0;
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}
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CanvasPictureWriter::~CanvasPictureWriter() {
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delete profile;
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delete[] cache;
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}
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void CanvasPictureWriter::setAntialias(int antialias) {
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assert(antialias >= 1);
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assert(canvas->getWidth() % antialias == 0);
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assert(canvas->getHeight() % antialias == 0);
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this->antialias = antialias;
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this->width = canvas->getWidth() / antialias;
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this->height = canvas->getHeight() / antialias;
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}
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void CanvasPictureWriter::setColorProfile(const ColorProfile &profile) {
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profile.copy(this->profile);
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}
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bool CanvasPictureWriter::saveCanvas(const string &filepath) {
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return save(filepath, width, height);
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}
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unsigned int CanvasPictureWriter::getPixel(int x, int y) {
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Color comp;
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if (antialias > 1) {
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int basex = x * antialias;
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int basey = y * antialias;
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double factor = 1.0 / (antialias * antialias);
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comp = COLOR_BLACK;
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for (int iy = 0; iy < antialias; iy++) {
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for (int ix = 0; ix < antialias; ix++) {
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Color col = getRawPixel(basex + ix, basey + iy);
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comp.r += col.r * factor;
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comp.g += col.g * factor;
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comp.b += col.b * factor;
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}
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}
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} else {
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comp = getRawPixel(x, y);
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}
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comp = profile->apply(comp);
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comp.normalize();
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return comp.to32BitBGRA();
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}
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Color CanvasPictureWriter::getRawPixel(int x, int y) {
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if (not(y >= cache_y && y < cache_y + antialias)) {
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// Load rows into cache
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delete[] cache;
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cache_y = y;
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cache_width = canvas->getWidth();
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cache = new Color[cache_width * antialias];
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CanvasPortion *portion = nullptr;
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PackStream *stream = new PackStream;
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Color *itcolor = cache;
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bool has_pixels = false;
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for (int cy = cache_y; cy < cache_y + antialias; cy++) {
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for (int cx = 0; cx < cache_width; cx++) {
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CanvasPortion *nportion = canvas->atPixel(cx, cy);
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if (nportion != portion) {
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portion = nportion;
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delete stream;
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stream = new PackStream;
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has_pixels =
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portion->getReadStream(*stream, cx - portion->getXOffset(), cy - portion->getYOffset());
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}
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if (has_pixels) {
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itcolor->load(stream);
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} else {
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*itcolor = COLOR_BLACK;
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}
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itcolor++;
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}
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}
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delete stream;
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}
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// Hit the cache
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return cache[(y - cache_y) * cache_width + x];
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}
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