GOB: Add some generic PreGob graphics functions

2 files changed, 76 insertions, 1 deletions

diff --git a/engines/gob/pregob/pregob.cpp b/engines/gob/pregob/pregob.cpp
index ab47adaac6..aea290214c 100644
--- a/engines/gob/pregob/pregob.cpp
+++ b/engines/gob/pregob/pregob.cpp
@@ -21,15 +21,73 @@
  */
 
 #include "gob/gob.h"
+#include "gob/global.h"
+#include "gob/util.h"
+#include "gob/palanim.h"
+#include "gob/draw.h"
+#include "gob/video.h"
 
 #include "gob/pregob/pregob.h"
 
 namespace Gob {
 
-PreGob::PreGob(GobEngine *vm) : _vm(vm) {
+PreGob::PreGob(GobEngine *vm) : _vm(vm), _fadedOut(false) {
 }
 
 PreGob::~PreGob() {
 }
 
+void PreGob::fadeOut() {
+	if (_fadedOut || _vm->shouldQuit())
+		return;
+
+	// Fade to black
+	_vm->_palAnim->fade(0, 0, 0);
+
+	_fadedOut = true;
+}
+
+void PreGob::fadeIn() {
+	if (!_fadedOut || _vm->shouldQuit())
+		return;
+
+	// Fade to palette
+	_vm->_draw->blitInvalidated();
+	_vm->_palAnim->fade(_vm->_global->_pPaletteDesc, 0, 0);
+	_vm->_draw->dirtiedRect(_vm->_draw->_backSurface, 0, 0, 319, 199);
+
+	_fadedOut = false;
+}
+
+void PreGob::clearScreen() {
+	_vm->_draw->_backSurface->clear();
+	_vm->_draw->dirtiedRect(_vm->_draw->_backSurface, 0, 0, 319, 199);
+	_vm->_draw->blitInvalidated();
+	_vm->_video->retrace();
+}
+
+void PreGob::initScreen() {
+	_vm->_util->setFrameRate(15);
+
+	_fadedOut = true;
+
+	_vm->_draw->initScreen();
+
+	_vm->_draw->_backSurface->clear();
+	_vm->_util->clearPalette();
+
+	_vm->_draw->forceBlit();
+	_vm->_video->retrace();
+
+	_vm->_util->processInput();
+}
+
+void PreGob::setPalette(const byte *palette, uint16 size) {
+	memcpy(_vm->_draw->_vgaPalette, palette, 3 * size);
+
+	// If we didn't fade out prior, immediately set the palette
+	if (!_fadedOut)
+		_vm->_video->setFullPalette(_vm->_global->_pPaletteDesc);
+}
+
 } // End of namespace Gob
diff --git a/engines/gob/pregob/pregob.h b/engines/gob/pregob/pregob.h
index e77e0ba17b..6418d6fd8a 100644
--- a/engines/gob/pregob/pregob.h
+++ b/engines/gob/pregob/pregob.h
@@ -35,7 +35,24 @@ public:
 	virtual void run() = 0;
 
 protected:
+	void initScreen(); ///< Initialize the game screen.
+
+	void fadeOut(); ///< Fade to black.
+	void fadeIn();  ///< Fade to the current palette.
+
+	void clearScreen();
+
+	/** Change the palette.
+	 *
+	 *  @param palette The palette to change to.
+	 *  @param size Size of the palette in colors.
+	 */
+	void setPalette(const byte *palette, uint16 size); ///< Change the palette
+
 	GobEngine *_vm;
+
+private:
+	bool _fadedOut; ///< Did we fade out?
 };
 
 } // End of namespace Gob