added simplistic gui (so far windows only)

.gitignore

@@ -1,4 +1,5 @@
 private/
 bin-win/sdl.dll
 bin-win/gui_sdl12.exe
-thumbs.db
+thumbs.db
+/ui.bmp

gui/loader.c

@@ -0,0 +1,57 @@
+#ifdef SDL2
+#include <stdint.h>
+#include <stdbool.h>
+#include <FreeImage/FreeImage.h>
+#include "loader.h"
+
+static FIBITMAP *dib=NULL;
+static uint16_t w,h;
+
+bool image_loadpicture(const char* filename) {
+  FREE_IMAGE_FORMAT fif=FIF_UNKNOWN;
+  int flag=0;
+  fif=FreeImage_GetFileType(filename,0);
+  if(fif==FIF_UNKNOWN) {
+    fif=FreeImage_GetFIFFromFilename(filename);
+  }
+  if((fif!=FIF_UNKNOWN)&&FreeImage_FIFSupportsReading(fif)) {
+    dib=FreeImage_Load(fif,filename,flag);
+    if(dib) {
+      w=FreeImage_GetWidth(dib);
+      h=FreeImage_GetHeight(dib);
+      if(w>4000||h>4000) {
+        FreeImage_Unload(dib);
+        dib=NULL;
+      } else {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+uint16_t image_width() {
+  return w;
+}
+
+uint16_t image_height() {
+  return h;
+}
+
+void image_convert(uint8_t *p_data) {
+  uint16_t x,y;
+  RGBQUAD quad;
+  for(y=0;y<h;y++) {
+    for(x=0;x<w;x++) {
+      FreeImage_GetPixelColor(dib,x,y,&quad);
+      p_data[y*w+x]=(quad.rgbRed+quad.rgbGreen+quad.rgbBlue)/3;
+    }
+  } 
+}
+
+void image_free() {
+  if(dib) FreeImage_Unload(dib);
+  dib=NULL;
+}
+
+#endif

gui/loader.h

@@ -0,0 +1,9 @@
+#ifdef SDL2
+#include <stdint.h>
+#include <stdbool.h>
+bool image_load(const char* filename,int flag);
+uint16_t image_width();
+uint16_t image_height();
+void image_convert(uint8_t *p_data);
+void image_free();
+#endif