git ssb

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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "lupng.h"
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#include "pngspark.h"
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static const size_t initial_size = 8;
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uint8_t parse_color(const char *color)
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{
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	return !strcmp("black", color) ? 0x00 : 0x99;
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}
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int pngspark_init(struct pngspark *ps, size_t height, const char *color)
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{
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	ps->size = initial_size;
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	ps->num_values = 0;
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	ps->values = malloc(initial_size * sizeof(double));
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	if (!ps->values) return 1;
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	ps->color = parse_color(color);
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	ps->height = height;
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	ps->max_value = 0;
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	return 0;
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}
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int pngspark_append(struct pngspark *ps, double value)
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{
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	size_t i = ps->num_values++;
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	if (i >= ps->size) {
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		ps->values = realloc(ps->values, sizeof(double) * (ps->size <<= 1));
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		if (!ps->values) return 1;
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	}
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	ps->values[i] = value;
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	if (value > ps->max_value)
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		ps->max_value = value;
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	return 0;
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}
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int pngspark_draw(struct pngspark *ps, uint8_t *data, size_t width,
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		size_t height)
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{
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	double *values = ps->values;
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	uint8_t color = ps->color;
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	for (size_t x = 0; x < width; x++) {
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		size_t value = values[x] * height;
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		data[x] = value;
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		for (size_t y = 0; y < height; y++)
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			data[x * width + y] = 0x9f;
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		/*
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		printf("write value: %zu, i: %zu\n", value, 1 * width + x);
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		for (size_t y = value+1; y < height; y++)
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			data[y * width + x] = color;
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			*/
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		(void)value;
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		(void)color;
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		(void)data;
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	}
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	return 0;
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}
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static size_t write_fd(const void *ptr, size_t size, size_t count,
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		void *userPtr)
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{
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    return fwrite(ptr, size, count, (FILE *)userPtr);
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}
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int pngspark_write(struct pngspark *ps, FILE *file)
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{
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    LuImage *img = luImageCreate(ps->num_values, ps->max_value+1, 1, 8);
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	if (!img) return 1;
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	printf("size: %zu\n", img->dataSize);
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	int ret = pngspark_draw(ps, img->data, ps->num_values, ps->max_value);
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	if (!ret)
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		ret = luPngWrite(write_fd, file, img);
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	luImageRelease(img);
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	return ret;
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}
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int pngspark_end(struct pngspark *ps)
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{
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	free(ps->values);
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	return 0;
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}
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