Changes to Chromium B.S.U. 0.9.16.1 for the fredygames.com build, 2026-10-23.

Each changed source file below carries a notice saying how and when it was changed. One data file is
replaced as well, which a text patch cannot carry: data/png/powerUpShield.png, the icon of the
shield, repair and super-shield power-ups (originally the Tux penguin), is replaced by a shield drawn
by make-shield-icon.py (FredyGames, 2026-10-23; the PNG carries the same notice in a text chunk).
build-chromium-bsu.sh copies it over the original after applying this patch.

diff --git a/src/Config.cpp b/src/Config.cpp
index 6bda90b..d4497f1 100644
--- a/src/Config.cpp
+++ b/src/Config.cpp
@@ -4,6 +4,9 @@
  * "Chromium B.S.U." is free software; you can redistribute
  * it and/or use it and/or modify it under the terms of the
  * "Clarified Artistic License"
+ *
+ * Changed for the fredygames.com build of Chromium B.S.U. on 2026-10-23 (only when
+ * compiled with Emscripten, under __EMSCRIPTEN__): the default screen size is 1024x768.
  */
 
 #ifdef HAVE_CONFIG_H
@@ -49,8 +52,13 @@ Config	*Config::m_instance = 0;
 Config::Config()
 {
 	//-- setup defaults
+#ifdef __EMSCRIPTEN__
+	m_screenW		= 1024;
+	m_screenH		= 768;
+#else
 	m_screenW		= 800;
 	m_screenH		= 600;
+#endif
 	m_screenA		=   1.3333333f;
 	m_screenFOV		=  30.0f;
 	m_screenNear	=  10.0;
diff --git a/src/Image.cpp b/src/Image.cpp
index 266de49..c67d155 100644
--- a/src/Image.cpp
+++ b/src/Image.cpp
@@ -5,6 +5,11 @@
  * "Chromium B.S.U." is free software; you can redistribute
  * it and/or use it and/or modify it under the terms of the
  * "Clarified Artistic License"
+ *
+ * Changed for the fredygames.com build of Chromium B.S.U. on 2026-10-23 (only when
+ * compiled with Emscripten, under __EMSCRIPTEN__): every image is
+ * converted to RGBA before upload (grayscale and palette PNGs were uploaded as luminance), and the
+ * blend modes walk the real image height.
  */
 
 #ifdef HAVE_CONFIG_H
@@ -65,6 +70,38 @@ GLuint Image::load(const char *filename, ImageMipMap mipmap, ImageBlend trans, G
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magfilter);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minfilter);
 
+#ifdef __EMSCRIPTEN__
+	// Every image becomes RGBA; SOLID drops the alpha channel, as glpng does, and the BLEND modes
+	// derive it from the color.
+	{
+		SDL_Surface *rgba = SDL_ConvertSurfaceFormat(image, SDL_PIXELFORMAT_RGBA32, 0);
+		SDL_FreeSurface(image);
+		if (!rgba)
+		{
+			fprintf(stderr, "Failed to convert %s: %s\n", filename, SDL_GetError());
+			return texture;
+		}
+		image = rgba;
+		SDL_LockSurface(image);
+		for(int y = 0; y < image->h; y++)
+		{
+			Uint8 *p = (Uint8 *)image->pixels + y*image->pitch;
+			for(int x = 0; x < image->w; x++, p += 4)
+			{
+				Uint32 a = p[0]+p[1]+p[2];
+				switch ( trans )
+				{
+					case IMG_SOLID:  p[3] = 0xFF; break;
+					case IMG_BLEND1: p[3] = a > 0xFF ? 0xFF : a; break;
+					case IMG_BLEND2: p[3] = a > 0x1FE ? 0xFF : a/2; break;
+					case IMG_BLEND3: p[3] = a/3; break;
+					default: break;
+				}
+			}
+		}
+		SDL_UnlockSurface(image);
+	}
+#else
 	// For the blend types, we need to convert to RGBA
 	if( trans != IMG_SOLID && trans != IMG_ALPHA )
 	{
@@ -147,6 +184,7 @@ GLuint Image::load(const char *filename, ImageMipMap mipmap, ImageBlend trans, G
 			image = tmp;
 		}
 	}
+#endif
 
 	GLenum format;
 	switch ( image->format->BytesPerPixel )
diff --git a/src/MainSDL.cpp b/src/MainSDL.cpp
index 88f65e8..9e33d9e 100644
--- a/src/MainSDL.cpp
+++ b/src/MainSDL.cpp
@@ -4,6 +4,11 @@
  * "Chromium B.S.U." is free software; you can redistribute
  * it and/or use it and/or modify it under the terms of the
  * "Clarified Artistic License"
+ *
+ * Changed for the fredygames.com build of Chromium B.S.U. on 2026-10-23 (only when
+ * compiled with Emscripten, under __EMSCRIPTEN__): changing the screen size resizes the existing
+ * canvas instead of opening a second window, and full screen is refused (the page has its own
+ * full-screen button; a browser only goes full screen from inside an input event).
  */
 
 #ifdef HAVE_CONFIG_H
@@ -55,6 +60,9 @@ MainSDL::MainSDL(int argc, char **argv)
 	xjoy = yjoy = xjNow = yjNow = 0;
 	adjCount = 0;
 	key_speed_x = key_speed_y = 0;
+#ifdef __EMSCRIPTEN__
+	window = 0;
+#endif
 
 	Uint32 initOpts;
 
@@ -367,6 +375,22 @@ bool MainSDL::setVideoMode()
 	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
 
 #if SDL_VERSION_ATLEAST(2,0,0)
+#ifdef __EMSCRIPTEN__
+	if(config->fullScreen())
+	{
+		if(window)
+			return false;
+		config->setFullScreen(false);
+	}
+	video_flags &= ~SDL_FULLSCREEN;
+	if(window)
+	{
+		SDL_SetWindowSize(window, w, h);
+		if(game->mainGL)
+			game->mainGL->initGL();
+		return true;
+	}
+#endif
 	window = SDL_CreateWindow("Chromium B.S.U.", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, w, h, video_flags);
 	if (!window) {
 		fprintf(stderr, _("Couldn't create window: %s\n"), SDL_GetError());
diff --git a/src/MainSDL_Event.cpp b/src/MainSDL_Event.cpp
index 117982b..eb2662c 100644
--- a/src/MainSDL_Event.cpp
+++ b/src/MainSDL_Event.cpp
@@ -4,6 +4,11 @@
  * "Chromium B.S.U." is free software; you can redistribute
  * it and/or use it and/or modify it under the terms of the
  * "Clarified Artistic License"
+ *
+ * Changed for the fredygames.com build of Chromium B.S.U. on 2026-10-23 (only when
+ * compiled with Emscripten, under __EMSCRIPTEN__): the ship follows the relative mouse motion of the
+ * browser's pointer lock, since a page cannot move the mouse pointer, and Q no longer quits (the menu
+ * still has quit).
  */
 
 #ifdef HAVE_CONFIG_H
@@ -344,7 +349,9 @@ void MainSDL::keyDown(SDL_Event *event)
 	switch(event->key.keysym.sym)
 	{
 	    case SDL_QUIT:
+#ifndef __EMSCRIPTEN__
 		case SDLK_q:
+#endif
 			game->game_quit = true;
 			break;
 		case SDLK_g:
@@ -539,6 +546,14 @@ void MainSDL::mouseMotion(SDL_Event *event)
 	int yNow;
 	int xDiff;
 	int yDiff;
+#ifdef __EMSCRIPTEN__
+	if(mouseToggle)
+	{
+		if(event->motion.xrel || event->motion.yrel)
+			game->hero->moveEvent(event->motion.xrel, event->motion.yrel);
+	}
+	return;
+#endif
 	if(mouseToggle)
 	{
 		xNow = event->motion.x;
@@ -640,6 +655,10 @@ void MainSDL::grabMouse(bool status, bool warpmouse)
 	if( config->debug() ) fprintf(stderr, _("MainSDL::grabMouse(%d)\n"), status);
 
 	mouseToggle = status;
+#ifdef __EMSCRIPTEN__
+	SDL_SetRelativeMouseMode(status ? SDL_TRUE : SDL_FALSE);
+	return;
+#endif
 	if(status)
 		SDL_ShowCursor(0);
 	else
diff --git a/src/main.cpp b/src/main.cpp
index 5129bdc..9128f94 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,6 +4,11 @@
  * "Chromium B.S.U." is free software; you can redistribute
  * it and/or use it and/or modify it under the terms of the
  * "Clarified Artistic License"
+ *
+ * Changed for the fredygames.com build of Chromium B.S.U. on 2026-10-23 (only when
+ * compiled with Emscripten, under __EMSCRIPTEN__): high scores are signed "player" (the browser has no
+ * user name), and fredygames_save() lets the page write the options when the tab is hidden or closed,
+ * since the game only writes them when it exits.
  */
 
 #ifdef HAVE_CONFIG_H
@@ -50,6 +55,15 @@
 
 #include "EnemyAircraft.h"
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+
+extern "C" EMSCRIPTEN_KEEPALIVE void fredygames_save()
+{
+	Config::instance()->saveFile();
+}
+#endif
+
 //----------------------------------------------------------
 int main(int argc, char **argv)
 {
@@ -57,6 +71,10 @@ int main(int argc, char **argv)
 	int	tmp;
 	int	vm = 2;
 
+#ifdef __EMSCRIPTEN__
+	setenv("USER", "player", 1);
+#endif
+
 #ifdef ENABLE_NLS
 	setlocale(LC_ALL, "");
         bindtextdomain(PACKAGE, LOCALEDIR);