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#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)
, _encodedImage(NULL) {
}
MSNImageDecoder::~MSNImageDecoder() {
destroy();
}
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[717];
g_system->getPaletteManager()->grabPalette(_palette, 16, 239);
byte pal_diff;
byte flag = stream.readByte();
if (flag == 0) {
pal_diff = 0;
_palette[141] = 0xE0;
_palette[142] = 0xE0;
_palette[143] = 0xE0;
} else {
pal_diff = 1;
for (int i = flag * 3; i != 0; --i) {
_palette[717 - i] = stream.readByte() << 2;
}
}
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] = {0};
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 - numRepeat];
--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 || _section[image].x2 == 0) {
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;
}
if (_encodedImage) {
delete[] _encodedImage;
_encodedImage = NULL;
}
}
}
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