2 files changed, 118 insertions, 0 deletions
diff --git a/RGBImage/RGBImage.c b/RGBImage/RGBImage.c
new file mode 100644
index 0000000..2896d72
--- /dev/null
+++ b/RGBImage/RGBImage.c
@@ -0,0 +1,83 @@
+#include "RGBImage.h"
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+void
+ARGB_set(ARGB* rgb, color color) {
+	rgb->a = (0xFF000000 & color) >> 24;
+	rgb->r = (0x00FF0000 & color) >> 16;
+	rgb->g = (0x0000FF00 & color) >> 8;
+	rgb->b = (0x000000FF & color);
+}
+
+void
+ARGB_merge(ARGB* bottom, color top) {
+	ARGB temp;
+	ARGB_set(&temp, top);
+	ARGB_mergeARGB(bottom, temp);
+}
+
+void
+ARGB_mergeARGB(ARGB* bottom, ARGB top) {
+	bottom->a = 255;
+	double perc = top.a / 255.0;
+
+	bottom->r = (bottom->r * (1.0 - perc)) + (top.r * perc);
+	bottom->g = (bottom->g * (1.0 - perc)) + (top.g * perc);
+	bottom->b = (bottom->b * (1.0 - perc)) + (top.b * perc);
+}
+
+RGBImage
+RGBImage_new(u32 width, u32 height) {
+	return (RGBImage){
+		.width  = width,
+		.height = height,
+		.img    = malloc(sizeof(ARGB) * width * height)
+	};
+}
+
+void
+RGBImage_free(RGBImage img) {
+	free(img.img);
+}
+
+void
+RGBImage_delete(RGBImage* img) {
+	RGBImage_free(*img);
+	img->width = img->height = 0;
+	img->img = NULL;
+}
+
+ARGB*
+RGBImage_at(RGBImage img, int row, int col) {
+	return img.img + (row % img.height) * img.width + col % img.width;
+}
+
+int
+ppm6_write(FILE* f, RGBImage img) {
+	fprintf(f, "P6\n%d %d\n255\n", img.width, img.height);
+	size_t size = img.width * img.height;
+	for (size_t i = 0; i < size; ++i) {
+		fputc(img.img[i].r, f);
+		fputc(img.img[i].g, f);
+		fputc(img.img[i].b, f);
+	}
+	return fflush(f);
+}
+
+RGBImage
+ppm_read(FILE* f) {
+	u32 type, width, height, colors;
+	fscanf(f, "P%d\n%d %d\n%d\n", &type, &width, &height, &colors);
+
+	RGBImage img = RGBImage_new(width, height);
+	ARGB* pixel = img.img;
+	for (size_t i = img.width * img.height; i > 0; --i, ++pixel) {
+		if (type == 3) {
+			pixel->a = 0xFF;
+			fscanf(f, "%d %d %d ", &pixel->r, &pixel->g, &pixel->b);
+		}
+	}
+	return img;
+}
diff --git a/RGBImage/RGBImage.h b/RGBImage/RGBImage.h
new file mode 100644
index 0000000..8980f7b
--- /dev/null
+++ b/RGBImage/RGBImage.h
@@ -0,0 +1,35 @@
+#ifndef _RGBIMAGE
+#define _RGBIMAGE
+
+#include "../global.h"
+#include <stdio.h>
+
+typedef uint8_t  byte;
+typedef uint32_t color;
+
+typedef struct ARGB {
+	byte a;
+	byte r;
+	byte g;
+	byte b;
+} ARGB;
+
+void ARGB_merge(ARGB* bottom, color top);
+void ARGB_mergeARGB(ARGB* bottom, ARGB top);
+void ARGB_set(ARGB* rgb, color color);
+
+typedef struct RGBImage {
+	u32 width;
+	u32 height;
+	ARGB* img;
+} RGBImage;
+
+RGBImage RGBImage_new(u32 width, u32 height);
+void RGBImage_free(RGBImage img);
+void RGBImage_delete(RGBImage* img);
+ARGB* RGBImage_at(RGBImage img, int row, int col);
+
+int ppm6_write(FILE* f, RGBImage img);
+RGBImage ppm_read(FILE* f);
+
+#endif /* _RGBIMAGE */