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98 lines
2.5 KiB
98 lines
2.5 KiB
4 years ago
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#include "utils/cl2_to_clx.hpp"
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#include <cstring>
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#include "utils/endian.hpp"
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namespace devilution {
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namespace {
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constexpr bool IsCl2Opaque(uint8_t control)
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{
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constexpr uint8_t Cl2OpaqueMin = 0x80;
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return control >= Cl2OpaqueMin;
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}
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constexpr uint8_t GetCl2OpaquePixelsWidth(uint8_t control)
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{
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return -static_cast<std::int8_t>(control);
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}
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constexpr bool IsCl2OpaqueFill(uint8_t control)
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{
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constexpr uint8_t Cl2FillMax = 0xBE;
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return control <= Cl2FillMax;
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}
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constexpr uint8_t GetCl2OpaqueFillWidth(uint8_t control)
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{
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constexpr uint8_t Cl2FillEnd = 0xBF;
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return static_cast<int_fast16_t>(Cl2FillEnd - control);
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}
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size_t CountCl2FramePixels(const uint8_t *src, const uint8_t *srcEnd)
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{
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size_t numPixels = 0;
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while (src != srcEnd) {
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uint8_t val = *src++;
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if (IsCl2Opaque(val)) {
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if (IsCl2OpaqueFill(val)) {
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numPixels += GetCl2OpaqueFillWidth(val);
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++src;
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} else {
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val = GetCl2OpaquePixelsWidth(val);
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numPixels += val;
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src += val;
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}
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} else {
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numPixels += val;
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}
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}
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return numPixels;
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}
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} // namespace
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uint16_t Cl2ToClx(uint8_t *data, size_t size, PointerOrValue<uint16_t> widthOrWidths)
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{
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uint32_t numGroups = 1;
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const uint32_t maybeNumFrames = LoadLE32(data);
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uint8_t *groupBegin = data;
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// If it is a number of frames, then the last frame offset will be equal to the size of the file.
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if (LoadLE32(&data[maybeNumFrames * 4 + 4]) != size) {
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// maybeNumFrames is the address of the first group, right after
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// the list of group offsets.
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numGroups = maybeNumFrames / 4;
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}
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for (size_t group = 0; group < numGroups; ++group) {
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uint32_t numFrames;
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if (numGroups == 1) {
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numFrames = maybeNumFrames;
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} else {
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groupBegin = &data[LoadLE32(&data[group * 4])];
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numFrames = LoadLE32(groupBegin);
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}
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uint8_t *frameEnd = &groupBegin[LoadLE32(&groupBegin[4])];
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for (size_t frame = 1; frame <= numFrames; ++frame) {
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uint8_t *frameBegin = frameEnd;
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frameEnd = &groupBegin[LoadLE32(&groupBegin[4 * (frame + 1)])];
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constexpr size_t Cl2FrameHeaderSize = 10;
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const size_t numPixels = CountCl2FramePixels(frameBegin + Cl2FrameHeaderSize, frameEnd);
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const uint16_t frameWidth = widthOrWidths.HoldsPointer() ? widthOrWidths.AsPointer()[frame - 1] : widthOrWidths.AsValue();
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const uint16_t frameHeight = numPixels / frameWidth;
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WriteLE16(&frameBegin[2], frameWidth);
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WriteLE16(&frameBegin[4], frameHeight);
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memset(&frameBegin[6], 0, 4);
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}
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}
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return numGroups == 1 ? 0 : numGroups;
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}
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} // namespace devilution
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