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35 lines
1.0 KiB
35 lines
1.0 KiB
4 years ago
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#include "engine/pcx_sprite.hpp"
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namespace devilution {
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std::unique_ptr<uint32_t[]> OwnedPcxSpriteSheet::calculateFrameOffsets(PcxSprite sprite, uint16_t numFrames)
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{
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uint16_t frameHeight = sprite.height() / numFrames;
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std::unique_ptr<uint32_t[]> frameOffsets { new uint32_t[numFrames] };
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frameOffsets[0] = 0;
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const unsigned width = sprite.width();
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const unsigned srcSkip = width % 2;
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const uint8_t *data = sprite.data();
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for (unsigned frame = 1; frame < numFrames; ++frame) {
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for (unsigned y = 0; y < frameHeight; ++y) {
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for (unsigned x = 0; x < width;) {
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constexpr uint8_t PcxMaxSinglePixel = 0xBF;
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const uint8_t byte = *data++;
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if (byte <= PcxMaxSinglePixel) {
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++x;
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continue;
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}
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constexpr uint8_t PcxRunLengthMask = 0x3F;
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const uint8_t runLength = (byte & PcxRunLengthMask);
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++data;
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x += runLength;
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}
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data += srcSkip;
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}
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frameOffsets[frame] = static_cast<uint32_t>(data - sprite.data());
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}
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return frameOffsets;
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}
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} // namespace devilution
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