From 35fdfc1eb9be244e37002380de6c3ac650648cab Mon Sep 17 00:00:00 2001
From: Krow Savcik <krow@savcik.xyz>
Date: Wed, 31 Jul 2024 13:35:43 +0300
Subject: feature: improved the export function to include frames into
 consideration

---
 src/export.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 src/export.c

(limited to 'src/export.c')

diff --git a/src/export.c b/src/export.c
new file mode 100644
index 0000000..381a240
--- /dev/null
+++ b/src/export.c
@@ -0,0 +1,124 @@
+#include <png.h>
+
+#include "types.h"
+#include "action.h"
+#include "canvas.h"
+#include "debug.h"
+
+#define COORD(x,y)  ((x) + (y) * c->w)
+
+uint8
+canvas_export_png(Canvas *c, const char *path)
+{
+	/* TODO: use a defer */
+	uint xcnt, ycnt, cnt, w, h, i, j, k, l, col;
+	FILE *file;
+	png_structp png_ptr;
+	png_infop info_ptr;
+	uint *data, **row_ptr;
+
+	if (c == NULL)
+		return 1;
+
+	if (c->layer_arr_cnt == 0 || c->frame_arr_cnt == 0)
+		return 1;
+
+	file = fopen(path, "wb");
+	if (!file)
+		return 1;
+
+	cnt = xcnt = ycnt = 0;
+
+	for (i = 0; i < c->frame_arr_cnt; i++) {
+		cnt++;
+		if (c->frames[i].state || i+1 == c->frame_arr_cnt) {
+			++ycnt;
+			xcnt = (cnt > xcnt) ? cnt : xcnt;
+			cnt = 0;
+		}
+	}
+	w = xcnt * c->w;
+	h = ycnt * c->h;
+
+	data = malloc(h*w*sizeof *data);
+	if (data == NULL) {
+		fclose(file);
+		return 1;
+	}
+	row_ptr = malloc(h*sizeof *row_ptr);
+	if (row_ptr == NULL) {
+		fclose(file);
+		free(data);
+		return 1;
+	}
+
+	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (!png_ptr) {
+		fclose(file);
+		free(data);
+		free(row_ptr);
+		return 1;
+	}
+
+	info_ptr = png_create_info_struct(png_ptr);
+	if (!info_ptr) {
+		png_destroy_write_struct(&png_ptr, NULL);
+		fclose(file);
+		free(data);
+		free(row_ptr);
+		return 1;
+	}
+
+	if (setjmp(png_jmpbuf(png_ptr))) {
+		png_destroy_write_struct(&png_ptr, &info_ptr);
+		fclose(file);
+		free(data);
+		free(row_ptr);
+		return 1;
+	}
+
+	png_init_io(png_ptr, file);
+	png_set_IHDR(png_ptr, info_ptr, w, h,
+	    8, PNG_COLOR_TYPE_RGBA, PNG_INTERLACE_NONE,
+	    PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+/*	png_set_invert_alpha(png_ptr);*/
+	png_write_info(png_ptr, info_ptr);
+/*	png_set_swap(png_ptr);*/
+
+	for (i = 0; i < w * h; i++)
+		data[i] = 0;
+
+	for (i = 0; i < h; i++)
+		row_ptr[i] = &data[i * w];
+
+	ycnt = cnt = 0;
+	for (i = 0; i < c->frame_arr_cnt; i++) {
+		for (k = 0; k < c->h; k++) {
+			for (j = 0; j < c->w; j++) {
+				col = 0;
+				for (l = 0; l < c->layer_arr_cnt; l++)
+					if (c->layers[l].visible)
+						col = canvas_blend_color(col,
+						    c->cells[c->layer_arr_cnt * i + l][COORD(j, k)]);
+				data[(ycnt * c->h + k) * w + cnt * c->w + j] =
+					((col&255)<<24) | (((col>>8)&255)<<16) | (((col>>16)&255)<<8) | (((col>>24)&255));
+			}
+		}
+
+		if (c->frames[i].state || i+1 == c->frame_arr_cnt) {
+			++ycnt;
+			cnt = 0;
+		} else {
+			cnt++;
+		}
+	}
+
+	png_write_image(png_ptr, row_ptr);
+	png_write_end(png_ptr, info_ptr);
+	png_destroy_write_struct(&png_ptr, &info_ptr);
+	fclose(file);
+	free(data);
+	free(row_ptr);
+
+	return 0;
+}
-- 
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