Initial Commit

src/image-ppm.cc

@@ -0,0 +1,59 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <errno.h>
+#include "image.hh"
+
+int ppm_init(image_ctx_t *ctx){
+	size_t buf_size;
+
+	/* Perform simple sanity checking */
+	if(ctx->canvas != NULL)
+		return EINVAL;
+	ctx->model = IMAGE_RGB; //Override this as we only support RGB
+	ctx->format = IMAGE_PPM;
+	ctx->extension = (char*)".ppm";
+
+	buf_size = ctx->width * ctx->height * RGB_SIZE;
+
+	/* Allocate the canvas buffer */
+	ctx->canvas = (uint8_t*) calloc(buf_size,sizeof(uint8_t));
+	ctx->next_pixel = ctx->canvas;
+	if(ctx->canvas == NULL)
+		return ENOMEM;
+
+	return 0;
+}
+
+int ppm_add_pixel(image_ctx_t *ctx,const uint8_t r,const uint8_t g,const uint8_t b,const uint8_t a){
+	register uint8_t* next;
+
+	next = ctx->next_pixel;
+
+	next[0] = r;
+	next[1] = g;
+	next[2] = b;
+
+	ctx->next_pixel += 3;
+
+	return 0;
+}
+
+int ppm_get_pixel(image_ctx_t *ctx,const size_t x,const size_t y,const uint8_t *r,const uint8_t *g,const uint8_t *b,const uint8_t *a){
+	/* STUB */
+	return 0;
+}
+
+int ppm_write(image_ctx_t *ctx, FILE* fd){
+	size_t written;
+	size_t count;
+
+	count = ctx->width * ctx->height * RGB_SIZE;
+
+	fprintf(fd, "P6\n%zu %zu\n255\n", ctx->width, ctx->height);
+	written = fwrite(ctx->canvas,sizeof(uint8_t),count,fd);
+	if(written < count)
+		return EPIPE;
+	
+	return 0;
+}