Initial screenshot support for paletted surfaces

Makefile

@@ -1,5 +1,5 @@
 all:
-	i586-mingw32msvc-gcc -Wall -Wl,--enable-stdcall-fixup -shared -s -o ddraw.dll main.c mouse.c palette.c surface.c clipper.c render.c ddraw.def -lgdi32 -lopengl32
+	i586-mingw32msvc-gcc -DHAVE_LIBPNG -Iinclude -Wall -Wl,--enable-stdcall-fixup -shared -s -o ddraw.dll main.c mouse.c palette.c surface.c clipper.c render.c screenshot.c lib/libpng14.a lib/libz.a ddraw.def -lgdi32 -lopengl32
 
 clean:
 	rm -f ddraw.dll

main.c

@@ -29,6 +29,11 @@ void mouse_init(HWND);
 void mouse_lock();
 void mouse_unlock();
 
+/* from screenshot.c */
+#ifdef HAVE_LIBPNG
+BOOL screenshot(struct IDirectDrawSurfaceImpl *);
+#endif
+
 IDirectDrawImpl *ddraw = NULL;
 
 DWORD WINAPI render_main(void);
@@ -296,6 +301,12 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
                     mouse_unlock();
                 }
             }
+#ifdef HAVE_LIBPNG
+            else if(wParam == VK_SNAPSHOT)
+            {
+                screenshot(ddraw->primary);
+            }
+#endif
             break;
         case WM_LBUTTONDOWN:
         case WM_RBUTTONDOWN:

screenshot.c

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2010 Toni Spets <toni.spets@iki.fi>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef HAVE_LIBPNG
+
+#include <windows.h>
+#include <stdio.h>
+#include <ctype.h>
+#include "ddraw.h"
+
+#include "palette.h"
+#include "surface.h"
+
+#include <png.h>
+
+BOOL screenshot(struct IDirectDrawSurfaceImpl *src)
+{
+    int i;
+    FILE *fh;
+
+    png_structp png_ptr;
+    png_infop info_ptr;
+    png_bytep *row_pointers;
+    png_color palette[256];
+
+    char filename[64];
+    time_t t = time(NULL);
+    strftime(filename, 64, "screenshot-%Y-%m-%d-%H_%M_%S.png", localtime(&t));
+
+    if(!src || !src->palette)
+    {
+        return FALSE;
+    }
+
+    if( !(fh = fopen(filename, "wb")) )
+    {
+        return FALSE;
+    }
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    if(!png_ptr)
+    {
+        return FALSE;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+
+    for(i=0;i<256;i++) {
+        palette[i].red = src->palette->data_bgr[i];
+        palette[i].green = src->palette->data_bgr[i] >> 8;
+        palette[i].blue = src->palette->data_bgr[i] >> 16;
+    }
+
+    setjmp(png_jmpbuf(png_ptr));
+
+    png_init_io(png_ptr, fh);
+
+    png_set_IHDR(png_ptr, info_ptr, src->width, src->height, 8, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+    png_set_PLTE(png_ptr, info_ptr, (png_colorp)&palette, 256);
+
+    row_pointers = (png_bytep *)png_malloc(png_ptr, sizeof(png_bytep) * src->height);
+
+    for(i=0;i<src->height;i++) {
+        row_pointers[i] = src->surface + (src->width * i);
+    }
+
+    png_set_rows(png_ptr, info_ptr, row_pointers);
+
+    png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
+
+    fclose(fh);
+
+    return TRUE;
+}
+
+#endif