PSP: added image viewer for viewing images during games

svn-id: r53455

1 files changed, 280 insertions, 0 deletions

diff --git a/backends/platform/psp/image_viewer.cpp b/backends/platform/psp/image_viewer.cpp
new file mode 100644
index 0000000000..66a5412034
--- /dev/null
+++ b/backends/platform/psp/image_viewer.cpp
@@ -0,0 +1,280 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/backends/platform/psp/osys_psp.cpp $
+ * $Id: osys_psp.cpp 46126 2009-11-24 14:18:46Z fingolfin $
+ *
+ */
+
+#include "common/scummsys.h"
+#include "common/str.h"
+#include "common/stream.h"
+#include "common/archive.h"
+#include "common/ptr.h"
+#include "gui/message.h"
+#include "engines/engine.h"
+#include "backends/platform/psp/input.h"
+#include "backends/platform/psp/display_client.h"
+#include "backends/platform/psp/image_viewer.h" 
+#include "backends/platform/psp/png_loader.h" 
+
+static const char *imageName = "psp_image";
+#define PSP_SCREEN_HEIGHT 272
+#define PSP_SCREEN_WIDTH 480
+ 
+bool ImageViewer::load(int imageNum) {
+	if (_init)
+		unload();
+		
+	// build string
+	char number[8];
+	sprintf(number, "%d", imageNum);
+	Common::String imageNameStr(imageName);	
+	Common::String specificImageName = imageNameStr + Common::String(number) + Common::String(".png");
+	
+	// search for image file
+	if (!SearchMan.hasFile(specificImageName)) {
+		PSP_ERROR("file %s not found\n", specificImageName.c_str());
+		return false;
+	}
+	
+	Common::ScopedPtr<Common::SeekableReadStream> file(SearchMan.createReadStreamForMember(specificImageName));
+	
+	_buffer = new Buffer();
+	_palette = new Palette();
+	_renderer = new GuRenderer();
+	
+	assert(_buffer);
+	assert(_palette);
+	assert(_renderer);
+	
+	// Load a PNG into our buffer and palette. Size it by the actual size of the image
+	PngLoader image(file, *_buffer, *_palette, Buffer::kSizeBySourceSize);
+	
+	PngLoader::Status status = image.allocate();	// allocate the buffers for the file
+	
+	char error[100];
+	if (status == PngLoader::BAD_FILE) {
+		sprintf(error, "Cannot display %s. Not a proper PNG file", specificImageName.c_str());
+		GUI::TimedMessageDialog dialog(error, 4000);
+		dialog.runModal();
+	} else if (status == PngLoader::OUT_OF_MEMORY) {
+		sprintf(error, "Out of memory loading %s. Try making the image smaller", specificImageName.c_str());
+		GUI::TimedMessageDialog dialog(error, 4000);
+		dialog.runModal();
+	}
+	// try to load the image file
+	if (!image.load()) {
+		sprintf(error, "Cannot display %s. Not a proper PNG file", specificImageName.c_str());
+		GUI::TimedMessageDialog dialog(error, 4000);
+		dialog.runModal();	
+	}
+	
+	setConstantRendererOptions();
+	setFullScreenImageParams();		// prepare renderer for full screen view
+	
+	_imageNum = imageNum;			// now we can say we displayed this image
+	_init = true;
+	
+	return true;
+}
+
+void ImageViewer::setConstantRendererOptions() {
+	_renderer->setBuffer(_buffer);
+	_renderer->setPalette(_palette);
+	
+	_renderer->setAlphaBlending(false);
+	_renderer->setColorTest(false);
+	_renderer->setUseGlobalScaler(false);
+	_renderer->setStretch(true);
+	_renderer->setOffsetInBuffer(0, 0);
+	_renderer->setDrawWholeBuffer();	
+}
+
+void ImageViewer::unload() {
+	delete _buffer;
+	delete _palette;
+	delete _renderer;
+	_buffer = 0;
+	_palette = 0;
+	_renderer = 0;
+	_init = false;
+}
+
+void ImageViewer::setVisible(bool visible) {
+	DEBUG_ENTER_FUNC();
+	if (_visible == visible)
+		return;
+
+	if (!g_engine)			// we can only run the image viewer when there's an engine
+		return;				// otherwise we won't know where to open the image
+			
+	// from here on, we're making the loader visible
+	if (visible && load(_imageNum ? _imageNum : 1))	{ // load the 1st image or the current
+		g_engine->pauseEngine(true);	
+		_visible = true;
+		setDirty();
+		setViewerButtons(true);
+		
+		GUI::TimedMessageDialog dialog("Image Viewer", 1000);
+		dialog.runModal();
+	} else {	// all other cases
+		_visible = false;
+		setDirty();
+		unload();
+		setViewerButtons(false);
+		
+		if (g_engine->isPaused())
+			g_engine->pauseEngine(false);
+	}
+}
+
+void ImageViewer::setViewerButtons(bool active) {
+	_inputHandler->setImageViewerMode(active);
+}	
+
+void ImageViewer::loadNextImage() {
+	if (!load(_imageNum+1)) {		// try to load the next image
+		if (!load(_imageNum))		// we failed, so reload the current image
+			setVisible(false);		// just hide
+	}
+}
+
+void ImageViewer::loadLastImage() {
+	if (_imageNum - 1 > 0) {
+		if (!load(_imageNum-1))
+			if (!load(_imageNum))
+				setVisible(false);	// we can't even show the old image so hide
+	}		
+}
+
+void ImageViewer::setFullScreenImageParams() {
+	// we try to fit the image fullscreen at least in one dimension
+	uint32 width = _buffer->getSourceWidth();
+	uint32 height = _buffer->getSourceHeight();	
+
+	_centerX = PSP_SCREEN_WIDTH / 2.0f;
+	_centerY = PSP_SCREEN_HEIGHT / 2.0f;
+	
+	// see if we fit width wise
+	if (PSP_SCREEN_HEIGHT >= (int)((height * PSP_SCREEN_WIDTH) / (float)width)) {
+		setZoom(PSP_SCREEN_WIDTH / (float)width);	
+	} else {
+		setZoom(PSP_SCREEN_HEIGHT / (float)height);
+	}
+}
+
+void ImageViewer::render() {
+	assert(_buffer);
+	assert(_renderer);
+	
+	_renderer->render();
+}
+
+void ImageViewer::modifyZoom(bool up) {
+	float factor = _zoomFactor;
+	if (up) 
+		factor += 0.1f;
+	else // down
+		factor -= 0.1f;
+	
+	setZoom(factor);	
+}
+
+void ImageViewer::setZoom(float value) { 
+	if (value <= 0.0f)		// don't want 0 or negative zoom
+		return;
+
+	_zoomFactor = value;
+	_renderer->setStretchXY(value, value); 
+	setOffsetParams();
+}
+
+void ImageViewer::moveImageX(int val) {
+	float newVal = _centerX + val;
+	
+	if (newVal < 0 || newVal > PSP_SCREEN_WIDTH)
+		return;
+	_centerX = newVal;
+	setOffsetParams();
+}
+
+void ImageViewer::moveImageY(int val) {
+	float newVal = _centerY + val;
+	
+	if (newVal < 0 || newVal > PSP_SCREEN_HEIGHT)
+		return;
+	_centerY = newVal;
+	setOffsetParams();
+}
+
+//	Set the renderer with the proper offset on the screen 
+//
+void ImageViewer::setOffsetParams() {
+	_visibleWidth = _zoomFactor * _buffer->getSourceWidth();
+	_visibleHeight = _zoomFactor * _buffer->getSourceHeight();		
+	
+	int offsetX = _centerX - (int)(_visibleWidth * 0.5f);
+	int offsetY = _centerY - (int)(_visibleHeight * 0.5f);
+	
+	_renderer->setOffsetOnScreen(offsetX, offsetY);
+}
+
+//	Handler events coming in from the inputHandler
+//
+void ImageViewer::handleEvent(uint32 event) {
+	DEBUG_ENTER_FUNC();
+	
+	switch (event) {	
+	case EVENT_HIDE:
+		setVisible(false);
+		break;
+	case EVENT_SHOW:
+		setVisible(true);
+		break;
+	case EVENT_ZOOM_IN:
+		modifyZoom(true);
+		break;
+	case EVENT_ZOOM_OUT:
+		modifyZoom(false);
+		break;
+	case EVENT_MOVE_LEFT:
+		moveImageX(-5);
+		break;
+	case EVENT_MOVE_UP:
+		moveImageY(-5);
+		break;
+	case EVENT_MOVE_RIGHT:
+		moveImageX(5);
+		break;
+	case EVENT_MOVE_DOWN:
+		moveImageY(5);
+		break;
+	case EVENT_NEXT_IMAGE:
+		loadNextImage();
+		break;
+	case EVENT_LAST_IMAGE:
+		loadLastImage();
+		break;
+	default:
+		PSP_ERROR("Unknown event %d\n", event);
+		break;
+	}
+}
\ No newline at end of file