2005-09-17 Duane Bailey <nayryeliab@gmail.com>

	* src/net/messagin.cpp, src/net/messageout.cpp, src/net/network.cpp:
	removed replaced MACOSX defines with big endian defines
	* src/graphics.cpp, src/graphics.h: added screenshot method
	* src/game.cpp: added code, so that when one presses 'alt-p' (for
	picture), it takes a screenshot and saves it to a png
	* src/Makefile.am, config.ac: added png library stuff

1 files changed, 100 insertions, 0 deletions

diff --git a/src/graphics.cpp b/src/graphics.cpp
index a3299650..ecee2b5f 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -29,6 +29,8 @@
 
 #include "resources/image.h"
 
+#include <png.h>
+
 extern volatile int framesToDraw;
 
 Graphics::Graphics():
@@ -239,3 +241,101 @@ void Graphics::updateScreen()
         SDL_Delay(10);
     }
 }
+
+bool Graphics::saveScreenshot(char *filename, ...)
+{
+    va_list ap;
+    char *newname = (char *)malloc(32);
+    va_start(ap, filename);
+    vsprintf(newname, filename, ap);
+    va_end(ap);
+
+    FILE *fp = fopen(newname, "wb");
+    if (!fp)
+    {
+        logger->log("could not open file &s for writing", newname);
+        return false;
+    }
+    
+    png_structp png_ptr;
+    png_infop info_ptr;
+    png_bytep *row_pointers;
+    int colortype;
+    
+    #if SDL_BYTEORDER == SDL_BIG_ENDIAN
+    int rmask = 0xff000000;
+    int gmask = 0x00ff0000;
+    int bmask = 0x0000ff00;
+    int amask = 0x000000ff;
+    #else
+    int rmask = 0x000000ff;
+    int gmask = 0x0000ff00;
+    int bmask = 0x00ff0000;
+    int amask = 0xff000000;
+    #endif
+    
+    SDL_Surface *surface = SDL_CreateRGBSurface(SDL_SWSURFACE, mScreen->w, 
+    mScreen->h, 32, rmask, gmask, bmask, amask);
+    //SDL_LockSurface(mScreen);
+    SDL_BlitSurface(mScreen, NULL, surface, NULL);
+    //SDL_UnlockSurface(mScreen);
+        
+    SDL_LockSurface(surface);
+        
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+    if (!png_ptr)
+    {
+        logger->log("Had trouble creating png_structp");
+        return false;
+    }
+    
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr)
+    {
+        logger->log("Could not create png_info");
+        return false;
+    }
+        
+    
+    if (setjmp(png_ptr->jmpbuf))
+    {
+        logger->log("problem writing to %s", newname);
+        return false;
+    }    
+
+    png_init_io(png_ptr, fp);
+
+    if (mScreen->format->BitsPerPixel == 24) colortype = PNG_COLOR_TYPE_RGB;
+    else colortype = PNG_COLOR_TYPE_RGB_ALPHA;
+    
+    png_set_IHDR(png_ptr, info_ptr, surface->w, surface->h, 8,colortype,
+    PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+    
+    png_write_info(png_ptr, info_ptr);
+    
+    png_set_packing(png_ptr);
+    
+    row_pointers = (png_bytep*) malloc(sizeof(png_bytep)*surface->h);
+    if (!row_pointers)
+    {
+        logger->log("Had trouble converting surface to row pointers");
+        return false;
+    }
+    
+    for (int i = 0; i < surface->h; i++)
+    row_pointers[i] = (png_bytep)(Uint8 *)surface->pixels + i * surface->pitch;
+
+    png_write_image(png_ptr, row_pointers);
+    png_write_end(png_ptr, info_ptr);
+    fclose(fp);
+    if (row_pointers) free(row_pointers);
+        
+    if (info_ptr->palette) free(info_ptr->palette);
+        
+    png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+                
+    SDL_UnlockSurface(surface);
+    SDL_FreeSurface(surface);
+
+    return true;
+}