Save to PNG

2 files changed, 94 insertions, 0 deletions

diff --git a/src/lib/png.c b/src/lib/png.c
new file mode 100644
index 0000000..d12a765
--- /dev/null
+++ b/src/lib/png.c
@@ -0,0 +1,64 @@
+#include <lib/png.h>
+
+#include <stdio.h>
+#include <png.h>
+
+// Save bitmap to file
+void save_png(struct bitmap_t* bitmap, char* fname)
+{
+  FILE *fp;
+  png_structp png_ptr = NULL;
+  png_infop info_ptr = NULL;
+  uint8_t pixel_size = 3;
+  uint8_t pixel_depth = 8;
+  png_byte ** row_pointers = NULL;
+  size_t x, y;
+  fp = fopen(fname, "wb");
+  if (fp == NULL) {
+    fprintf(stderr, "Error opening file\n");
+    return;
+  }
+  png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if (png_ptr == NULL) {
+    fprintf(stderr, "Error creating write structure\n");
+    fclose(fp);
+    return;
+  }
+  info_ptr = png_create_info_struct(png_ptr);
+  if (info_ptr == NULL) {
+    fprintf(stderr, "Error creating info structure\n");
+    fclose(fp);
+    return;
+  }
+  if (setjmp(png_jmpbuf(png_ptr))) {
+    fprintf(stderr, "Error setting jmp\n");
+    fclose(fp);
+    return;
+  }
+  png_set_IHDR(png_ptr, info_ptr,
+	       bitmap->width, bitmap->height,
+	       pixel_depth,
+	       PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+	       PNG_FILTER_TYPE_DEFAULT);
+
+  row_pointers = png_malloc(png_ptr, bitmap->height*sizeof(png_byte*));
+  for (y = 0; y < bitmap->height; y++) {
+    png_byte *row = png_malloc(png_ptr, sizeof(uint8_t)*bitmap->width*pixel_size);
+    row_pointers[y] = row;
+    for (x = 0; x < bitmap->width; x++) {
+      *row++ = bitmap->image_buffer[x + y*bitmap->width].red;
+      *row++ = bitmap->image_buffer[x + y*bitmap->width].green;
+      *row++ = bitmap->image_buffer[x + y*bitmap->width].blue;
+    }
+  }
+  png_init_io(png_ptr, fp);
+  png_set_rows(png_ptr, info_ptr, row_pointers);
+  png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
+  for (y = 0; y < bitmap->height; y++) {
+    png_free(png_ptr, row_pointers[y]);
+  }
+  png_free(png_ptr, row_pointers);
+  png_destroy_write_struct(&png_ptr, &info_ptr);
+  fclose(fp);
+}
+
diff --git a/src/lib/seg/util.c b/src/lib/seg/util.c
index 530c326..10b8fa8 100644
--- a/src/lib/seg/util.c
+++ b/src/lib/seg/util.c
@@ -1,5 +1,6 @@
 #include <lib/seg/util.h>
 #include <lib/algo/flood_fill.h>
+#include <lib/png.h>
 #include <tiffio.h>
 #include <assert.h>
 #include <stdio.h>
@@ -260,3 +261,32 @@ uint16_t* tif_to_labels(char* tif_file_name, uint32_t *width, uint32_t *height,
   TIFFClose(tif);
   return labels;
 }
+
+// Convert mask to bitmap
+struct bitmap_t* uint16_to_bitmap(uint16_t* buffer, uint32_t width, uint32_t height)
+{
+  struct pixel_t* out_buffer = (struct pixel_t*)calloc(width*height, sizeof(struct pixel_t));
+  if (out_buffer == NULL) {
+    return NULL;
+  }
+  struct bitmap_t* bitmap = (struct bitmap_t*)malloc(sizeof(struct bitmap_t));
+  if (bitmap == NULL) {
+    free(out_buffer);
+    return NULL;
+  }
+  for (size_t y = 0; y < height; y++) {
+    for (size_t x = 0; x < width; x++) {
+      size_t coord = x + y*width;
+      uint8_t red   = (buffer[coord] & 0xF00) >> 4*2;
+      uint8_t green = (buffer[coord] & 0x0F0) >> 4*1;
+      uint8_t blue  = (buffer[coord] & 0x00F) >> 4*0;
+      out_buffer[coord].red = red | (red << 4);
+      out_buffer[coord].green = green | (green << 4);
+      out_buffer[coord].blue = blue | (blue << 4);
+    }
+  }
+  bitmap->image_buffer = out_buffer;
+  bitmap->width = (size_t)width;
+  bitmap->height = (size_t)height;
+  return bitmap;
+}