From 39f271589fb9db3d6a383857817b13a9bb59d981 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Mon, 15 Oct 2018 23:06:47 +0200
Subject: ported zlib and libpng and improved compositor to handle 32 AND 24
 bit depth

---
 userspace/pain/Makefile |   6 ++
 userspace/pain/pain1.c  | 200 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 206 insertions(+)
 create mode 100644 userspace/pain/Makefile
 create mode 100644 userspace/pain/pain1.c

(limited to 'userspace/pain')

diff --git a/userspace/pain/Makefile b/userspace/pain/Makefile
new file mode 100644
index 0000000..bfa31c8
--- /dev/null
+++ b/userspace/pain/Makefile
@@ -0,0 +1,6 @@
+CC=i686-foolos-gcc
+
+pain1 : pain1.c
+	i686-foolos-gcc pain1.c -lpng -lz -o pain1
+clean:
+	-rm pain1
diff --git a/userspace/pain/pain1.c b/userspace/pain/pain1.c
new file mode 100644
index 0000000..a3fb03a
--- /dev/null
+++ b/userspace/pain/pain1.c
@@ -0,0 +1,200 @@
+// http://zarb.org/~gc/html/libpng.html
+
+#include "../put_pixel.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+ 
+#define dimx  640
+#define dimy  480
+
+/*
+ * Copyright 2002-2010 Guillaume Cottenceau.
+ *
+ * This software may be freely redistributed under the terms
+ * of the X11 license.
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+#define PNG_DEBUG 3
+#include <png.h>
+
+void abort_(const char * s, ...)
+{
+        va_list args;
+        va_start(args, s);
+        vfprintf(stderr, s, args);
+        fprintf(stderr, "\n");
+        va_end(args);
+        abort();
+}
+
+int x, y;
+
+int width, height;
+png_byte color_type;
+png_byte bit_depth;
+
+png_structp png_ptr;
+png_infop info_ptr;
+int number_of_passes;
+png_bytep * row_pointers;
+
+void read_png_file(char* file_name)
+{
+        char header[8];    // 8 is the maximum size that can be checked
+
+        /* open file and test for it being a png */
+        FILE *fp = fopen(file_name, "rb");
+        if (!fp)
+                abort_("[read_png_file] File %s could not be opened for reading", file_name);
+        fread(header, 1, 8, fp);
+        if (png_sig_cmp(header, 0, 8))
+                abort_("[read_png_file] File %s is not recognized as a PNG file", file_name);
+
+
+        /* initialize stuff */
+        png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+
+        if (!png_ptr)
+                abort_("[read_png_file] png_create_read_struct failed");
+
+        info_ptr = png_create_info_struct(png_ptr);
+        if (!info_ptr)
+                abort_("[read_png_file] png_create_info_struct failed");
+
+        if (setjmp(png_jmpbuf(png_ptr)))
+                abort_("[read_png_file] Error during init_io");
+
+        png_init_io(png_ptr, fp);
+        png_set_sig_bytes(png_ptr, 8);
+
+        png_read_info(png_ptr, info_ptr);
+
+        width = png_get_image_width(png_ptr, info_ptr);
+        height = png_get_image_height(png_ptr, info_ptr);
+        color_type = png_get_color_type(png_ptr, info_ptr);
+        bit_depth = png_get_bit_depth(png_ptr, info_ptr);
+
+        number_of_passes = png_set_interlace_handling(png_ptr);
+        png_read_update_info(png_ptr, info_ptr);
+
+
+        /* read file */
+        if (setjmp(png_jmpbuf(png_ptr)))
+                abort_("[read_png_file] Error during read_image");
+
+        row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
+        for (y=0; y<height; y++)
+                row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr));
+
+        png_read_image(png_ptr, row_pointers);
+
+        fclose(fp);
+}
+
+
+void write_png_file(char* file_name)
+{
+        /* create file */
+        FILE *fp = fopen(file_name, "wb");
+        if (!fp)
+                abort_("[write_png_file] File %s could not be opened for writing", file_name);
+
+
+        /* initialize stuff */
+        png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+
+        if (!png_ptr)
+                abort_("[write_png_file] png_create_write_struct failed");
+
+        info_ptr = png_create_info_struct(png_ptr);
+        if (!info_ptr)
+                abort_("[write_png_file] png_create_info_struct failed");
+
+        if (setjmp(png_jmpbuf(png_ptr)))
+                abort_("[write_png_file] Error during init_io");
+
+        png_init_io(png_ptr, fp);
+
+
+        /* write header */
+        if (setjmp(png_jmpbuf(png_ptr)))
+                abort_("[write_png_file] Error during writing header");
+
+        png_set_IHDR(png_ptr, info_ptr, width, height,
+                     bit_depth, color_type, PNG_INTERLACE_NONE,
+                     PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+
+        png_write_info(png_ptr, info_ptr);
+
+
+        /* write bytes */
+        if (setjmp(png_jmpbuf(png_ptr)))
+                abort_("[write_png_file] Error during writing bytes");
+
+        png_write_image(png_ptr, row_pointers);
+
+
+        /* end write */
+        if (setjmp(png_jmpbuf(png_ptr)))
+                abort_("[write_png_file] Error during end of write");
+
+        png_write_end(png_ptr, NULL);
+
+        /* cleanup heap allocation */
+        for (y=0; y<height; y++)
+                free(row_pointers[y]);
+        free(row_pointers);
+
+        fclose(fp);
+}
+
+
+void process_file(void)
+{
+        if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_RGB)
+                abort_("[process_file] input file is PNG_COLOR_TYPE_RGB but must be PNG_COLOR_TYPE_RGBA "
+                       "(lacks the alpha channel)");
+
+        if (png_get_color_type(png_ptr, info_ptr) != PNG_COLOR_TYPE_RGBA)
+                abort_("[process_file] color_type of input file must be PNG_COLOR_TYPE_RGBA (%d) (is %d)",
+                       PNG_COLOR_TYPE_RGBA, png_get_color_type(png_ptr, info_ptr));
+
+        for (y=0; y<height; y++) {
+                png_byte* row = row_pointers[y];
+                for (x=0; x<width; x++) {
+                        png_byte* ptr = &(row[x*4]);
+                        //printf("Pixel at position [ %d - %d ] has RGBA values: %d - %d - %d - %d\n",
+                          //     x, y, ptr[0], ptr[1], ptr[2], ptr[3]);
+
+                        /* set red value to 0 and green value to the blue one */
+                        //ptr[0] = 0;
+                        //ptr[1] = ptr[2];
+                        if(x<dimx&&y<dimy)put_pixel(x,y,ptr[2]|ptr[1]<<8|ptr[0]<<16);
+
+                }
+        }
+}
+
+
+int main(int argc, char **argv)
+{
+        if (argc != 2)
+                abort_("Usage: program_name <file_in>");
+
+        _gui_win();
+        read_png_file(argv[1]);
+        process_file();
+        _gui_rect();
+        while(1);
+//        write_png_file(argv[2]);
+
+        return 0;
+}
-- 
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