void PixMap::read_direct_image(ReadSource in, unique_ptr<RasterImage>& image) const {
if (pixel_type != RGB_DIRECT) {
throw Exception("image is not direct");
}
if (pack_type != 4) {
throw Exception(format("unsupported pack_type {0}", pack_type));
}
image.reset(new RasterImage(bounds));
if (row_bytes == 0) {
return;
}
size_t bytes_read = 0;
for (int y = 0; y < bounds.height(); ++y) {
Bytes bytes;
if (row_bytes <= 250) {
bytes.resize(read<uint8_t>(in));
bytes_read += 1;
} else {
bytes.resize(read<uint16_t>(in));
bytes_read += 2;
}
in.shift(bytes.data(), bytes.size());
bytes_read += bytes.size();
BytesSlice remainder(bytes);
Bytes components;
while (!remainder.empty()) {
uint8_t header = read<uint8_t>(remainder);
if (header >= 0x80) {
components.push(0x101 - header, read<uint8_t>(remainder));
} else {
size_t size = header + 1;
components.push(size, '\0');
uint8_t* data = components.data() + components.size() - size;
remainder.shift(data, size);
}
}
const int16_t w = bounds.width();
const BytesSlice red = components.slice((cmp_count - 3) * w, w);
const BytesSlice green = components.slice((cmp_count - 2) * w, w);
const BytesSlice blue = components.slice((cmp_count - 1) * w);
for (int x = 0; x < w; ++x) {
image->set(x, y, AlphaColor(red.at(x), green.at(x), blue.at(x)));
}
}
if ((bytes_read % 2) != 0) {
in.shift(1);
}
}
void read_from(ReadSource in, BitMap& out) {
read(in, out.base_addr);
read(in, out.row_bytes);
read(in, out.bounds);
if (out.base_addr != 0) {
throw Exception("PixMap::base_addr must be 0");
}
}
virtual void visit_object(const StringMap<Json>& value) const {
if (_state == NEW) {
_state = UNLOCKED_CHAPTERS;
if (value.find("unlocked-levels") != value.end()) {
value.find("unlocked-levels")->second.accept(*this);
}
_state = NEW;
return;
}
throw Exception("invalid ledger content");
}
void PixMap::read_packed_image(
sfz::ReadSource in, const ColorTable& clut, unique_ptr<RasterImage>& image) const {
if (pixel_type != INDEXED) {
throw Exception("image is not indexed");
}
image.reset(new RasterImage(bounds));
if (row_bytes == 0) {
return;
}
size_t bytes_read = 0;
for (int y = 0; y < bounds.height(); ++y) {
Bytes bytes;
if (row_bytes <= 250) {
bytes.resize(read<uint8_t>(in));
bytes_read += 1;
} else {
bytes.resize(read<uint16_t>(in));
bytes_read += 2;
}
in.shift(bytes.data(), bytes.size());
bytes_read += bytes.size();
int32_t x = 0;
BytesSlice remainder = bytes;
while (!remainder.empty()) {
uint8_t header = read<uint8_t>(remainder);
if (header >= 0x80) {
uint8_t value = read<uint8_t>(remainder);
uint8_t size = 0x101 - header;
for (int j = 0; j < size; ++j) {
if (x < bounds.width()) {
image->set(x + bounds.left, y + bounds.top, lookup(clut, value));
}
++x;
}
} else {
uint8_t size = header + 1;
for (int j = 0; j < size; ++j) {
if (x < bounds.width()) {
uint8_t value = read<uint8_t>(remainder);
image->set(x + bounds.left, y + bounds.top, lookup(clut, value));
}
++x;
}
}
}
}
if ((bytes_read % 2 == 1)) {
in.shift(1);
}
}
void BitsSlice::shift(uint8_t* data, size_t size) {
if (size == 0) {
return;
} else if (size + _bit_index > 8) {
throw Exception(format("unhandled case ({0} + {1})", size, _bit_index));
}
uint8_t byte = _bytes.at(0);
*data = bits(byte, _bit_index, _bit_index + size);
_bit_index += size;
if (_bit_index == 8) {
_bytes.shift(1);
_bit_index = 0;
}
}
void read_from(ReadSource in, PixMap& out) {
read(in, out.row_bytes);
out.row_bytes &= 0x3fff;
read(in, out.bounds);
read(in, out.pm_version);
read(in, out.pack_type);
read(in, out.pack_size);
read(in, out.h_res);
read(in, out.v_res);
read(in, out.pixel_type);
read(in, out.pixel_size);
read(in, out.cmp_count);
read(in, out.cmp_size);
read(in, out.plane_bytes);
read(in, out.pm_table);
read(in, out.pm_reserved);
if (out.plane_bytes != 0) {
throw Exception("PixMap::plane_bytes must be 0");
}
if (out.pm_reserved != 0) {
throw Exception("PixMap::pm_reserved must be 0");
}
switch (out.pixel_type) {
case INDEXED: {
switch (out.pixel_size) {
case 1:
case 2:
case 4:
case 8:
break;
default:
throw Exception(format("indexed pixels may not have size {0}", out.pixel_size));
}
if ((out.pack_type != 0) || (out.pack_size != 0)) {
throw Exception("indexed pixels may not be packed");
}
if ((out.cmp_count != 1) || (out.cmp_size != out.pixel_size)) {
throw Exception("indexed pixels must have one component");
}
break;
}
case RGB_DIRECT: {
switch (out.pixel_size) {
case 16: {
throw Exception(format("unsupported pixel_size {0}", out.pixel_size));
break;
}
case 32: {
if (out.cmp_size != 8) {
throw Exception("32-bit direct pixels must have cmp_size 8");
}
break;
}
default: {
throw Exception(format("direct pixels may not have size {0}", out.pixel_size));
}
}
if ((out.cmp_count != 3) && (out.cmp_count != 4)) {
throw Exception("direct pixels must have three or four components");
}
break;
}
default: {
throw Exception(format("illegal PixMap pixel_type {0}", out.pixel_type));
}
}
}
