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#include "renderers.h"
#include <stdio.h>
#include "fractal_render.h"
#include <gd.h>
static inline byte scale_iterations(const byte max_iterations, const byte iteration){
return (byte)((double)iteration / max_iterations * 255);
}
/*
* Convert a grid into a gd image with true color
* NOTE: modifying the size of colors will allow this function to use the
* millions of colors the true colors support
* As of now it is identical to converter, but should be changed
*/
gdImagePtr truecolor_converter(const grid_t* grid){
const size_t width = grid->x;
const size_t height = grid->y;
const byte* data = grid->data;
const byte max_iterations = grid->max_iterations;
gdImagePtr img = gdImageCreateTrueColor(width, height);
int colors[256];
for(size_t i = 0; i < 255; i++){
colors[i] = gdImageColorAllocate(img, 0, i, i/2);
}
colors[255] = gdImageColorAllocate(img, 0, 0, 0);
for(size_t y = 0; y < height; y++){
for(size_t x = 0; x < width; x++){
byte iteration = data[y * width + x];
byte scaled_iteration = scale_iterations(max_iterations, iteration);
int color = colors[scaled_iteration];
gdImageSetPixel(img, x, y, color);
}
}
return img;
}
/*
* Convert a grid into a gd image
*/
gdImagePtr converter(const grid_t* grid){
const size_t width = grid->x;
const size_t height = grid->y;
const byte* data = grid->data;
const byte max_iterations = grid->max_iterations;
gdImagePtr img = gdImageCreate(width, height);
int colors[256];
for(size_t i = 0; i < 255; i++){
colors[i] = gdImageColorAllocate(img, 0, i, i/2);
}
colors[255] = gdImageColorAllocate(img, 0, 0, 0);
for(size_t y = 0; y < height; y++){
for(size_t x = 0; x < width; x++){
byte iteration = data[y * width + x];
byte scaled_iteration = scale_iterations(max_iterations, iteration);
int color = colors[scaled_iteration];
gdImageSetPixel(img, x, y, color);
}
}
return img;
}
void render_png(FILE *output, const renderer_params* params){
gdImagePtr img = truecolor_converter(params->grid);
gdImagePng(img, output);
gdImageDestroy(img);
}
void render_gif(FILE* output, const renderer_params* params){
const size_t size = params->grid_array.size;
grid_t** grids = params->grid_array.grids;
const int delay = params->grid_array.delay;
gdImagePtr imgs[size];
imgs[0] = converter(grids[0]);
gdImageGifAnimBegin(imgs[0], output, 1, -1);
gdImageGifAnimAdd(imgs[0], output, 0, 0, 0, delay, 1, NULL);
for(size_t i = 1; i < size; i++){
imgs[i] = converter(grids[i]);
gdImagePaletteCopy(imgs[i], imgs[i-1]);
gdImageGifAnimAdd(imgs[i], output, 0, 0, 0, delay, 1, imgs[i-1]);
}
gdImageGifAnimEnd(output);
for(size_t i = 0; i < size; i++){
gdImageDestroy(imgs[i]);
}
}
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