1 files changed, 154 insertions, 3 deletions
diff --git a/engines/supernova/graphics.cpp b/engines/supernova/graphics.cpp
index 1daa94b42d..e2467d1c3c 100644
--- a/engines/supernova/graphics.cpp
+++ b/engines/supernova/graphics.cpp
@@ -1,11 +1,162 @@
+#include "common/algorithm.h"
+#include "common/file.h"
+#include "common/stream.h"
+#include "common/system.h"
+#include "graphics/palette.h"
+#include "graphics/surface.h"
+
 #include "graphics.h"
 
+namespace Supernova {
+
 MSNImageDecoder::MSNImageDecoder()
-{
+	: _surface(NULL)
+	, _palette(NULL) {
+}
 
+MSNImageDecoder::~MSNImageDecoder() {
+	destroy();
 }
 
-MSNImageDecoder::~MSNImageDecoder()
-{
+bool MSNImageDecoder::loadStream(Common::SeekableReadStream &stream) {
+	destroy();
+	
+	size_t size = 0;
+	size  = (stream.readUint16LE() + 0xF) >> 4;
+	size |= (stream.readUint16LE() & 0xF) << 12;
+	size += 0x70;    // zus_paragraph
+	size *= 16;      // a paragraph is 16 bytes
+	_encodedImage = new byte[size];
+
+	_palette = new byte[768];
+	g_system->getPaletteManager()->grabPalette(_palette, 0, 256);
+
+	byte pal_diff;
+	byte flag = stream.readByte();
+	if (flag == 0) {
+		pal_diff = 0;
+		_palette[141] = 0x38;
+		_palette[142] = 0x38;
+		_palette[143] = 0x38;
+	} else {
+		pal_diff = 1;
+		for (int i = flag * 3; i != 0; --i) {
+			_palette[717 - i] = stream.readByte();
+		}
+	}
+	g_system->getPaletteManager()->setPalette(_palette, 0, 256);
+
+	byte numSections = stream.readByte();
+	for (size_t i = 0; i < kMaxSections; ++i) {
+		_section[i].addressHigh = 0xff;
+		_section[i].addressLow = 0xffff;
+		_section[i].x2 = 0;
+	}
+	for (int i = 0; i < numSections; ++i) {
+		_section[i].x1 = stream.readUint16LE();
+		_section[i].x2 = stream.readUint16LE();
+		_section[i].y1 = stream.readByte();
+		_section[i].y2 = stream.readByte();
+		_section[i].next = stream.readByte();
+		_section[i].addressLow = stream.readUint16LE();
+		_section[i].addressHigh = stream.readByte();
+	}
+	
+	byte numClickFields = stream.readByte();
+	for (int i = 0; i < numClickFields; ++i) {
+		_clickField[i].x1 = stream.readUint16LE();
+		_clickField[i].x2 = stream.readUint16LE();
+		_clickField[i].y1 = stream.readByte();
+		_clickField[i].y2 = stream.readByte();
+		_clickField[i].next = stream.readByte();
+	}
+	
+	byte zwCodes[256];
+	byte numRepeat = stream.readByte();
+	byte numZw = stream.readByte();
+	stream.read(zwCodes, numZw);
+	numZw += numRepeat;
+	
+	byte input = 0;
+	size_t i = 0;
+	// wat
+	while (stream.read(&input, 1)) {
+		if (input < numRepeat) {
+			++input;
+			byte value = stream.readByte();
+			for (--value; input > 0; --input) {
+				_encodedImage[i++] = value;
+			}
+		} else if (input < numZw) {
+			input = zwCodes[input];
+			--input;
+			_encodedImage[i++] = input;
+			_encodedImage[i++] = input;
+		} else {
+			input -= pal_diff;
+			_encodedImage[i++] = input;
+		}
+	}
 	
+	return true;
+}
+
+bool MSNImageDecoder::loadSection(int section) {
+	_surface = new Graphics::Surface;
+	_surface->create(320, 200, g_system->getScreenFormat());
+	byte *surfacePixels = static_cast<byte *>(_surface->getPixels());
+	
+	const uint32 kInvalidAddress = 0x00FFFFFF;
+	
+	size_t image = section;
+	if (image < 128) {
+		do {
+			uint32 offset = (_section[image].addressHigh << 16) + _section[image].addressLow;
+			if (offset == kInvalidAddress) {
+				return false;
+			}
+			int width = _section[image].x2 - _section[image].x1 + 1;
+			int height = _section[image].y2 - _section[image].y1 + 1;
+			uint32 destAddress = 320 * _section[image].y1 + _section[image].x1;
+			while (height) {
+				Common::copy(_encodedImage + offset, _encodedImage + offset + width, surfacePixels + destAddress);
+				offset += width;
+				destAddress += 320;
+				--height;
+			}
+			
+			image = _section[image].next;
+		} while (image != 0);
+	} else {
+		image -= 128;
+		do {
+			int width = _section[image].x2 - _section[image].x1 + 1;
+			int height = _section[image].y2 - _section[image].y1 + 1;
+			uint32 destAddress = 320 * _section[image].y1 + _section[image].x1;
+			uint32 offset = (_section[image].addressHigh << 16) + _section[image].addressLow + destAddress;
+			while (height) {
+				Common::copy(_encodedImage + offset, _encodedImage + offset + width, surfacePixels + destAddress);
+				offset += 320;
+				destAddress += 320;
+				--height;
+			}
+			
+			image = _section[image].next;
+		} while (image != 0);
+	}
+	
+	return true;
+}
+
+void MSNImageDecoder::destroy() {
+	if (_palette) {
+		delete[] _palette;
+		_palette = NULL;
+	}
+	if (_surface) {
+		_surface->free();
+		_surface = NULL;
+	}
+}
+
 }