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88 lines
2.5 KiB
88 lines
2.5 KiB
4 years ago
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#include "utils/pcx.hpp"
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#include <cstring>
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#include <memory>
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#include "appfat.h"
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#ifdef USE_SDL1
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#include "utils/sdl2_to_1_2_backports.h"
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#endif
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namespace devilution {
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namespace {
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constexpr unsigned NumPaletteColors = 256;
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} // namespace
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bool LoadPcxMeta(SDL_RWops *handle, int &width, int &height, uint8_t &bpp)
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{
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PCXHeader pcxhdr;
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if (SDL_RWread(handle, &pcxhdr, PcxHeaderSize, 1) == 0) {
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return false;
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}
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width = SDL_SwapLE16(pcxhdr.Xmax) - SDL_SwapLE16(pcxhdr.Xmin) + 1;
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height = SDL_SwapLE16(pcxhdr.Ymax) - SDL_SwapLE16(pcxhdr.Ymin) + 1;
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bpp = pcxhdr.BitsPerPixel;
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return true;
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}
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bool LoadPcxPixelsAndPalette(SDL_RWops *handle, int width, int height, std::uint8_t bpp,
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uint8_t *buffer, std::ptrdiff_t bufferPitch, SDL_Color *palette)
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{
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std::ptrdiff_t pixelDataSize = SDL_RWsize(handle);
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if (pixelDataSize < 0) {
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// Unable to determine size, or an error occurred.
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return false;
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}
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// SDL_RWsize gives the total size of the file however we've already read the header from an earlier call to
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// LoadPcxMeta, so we only need to read the remainder of the file.
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const std::size_t readSize = pixelDataSize - PcxHeaderSize;
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std::unique_ptr<uint8_t[]> fileBuffer { new uint8_t[readSize] };
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if (SDL_RWread(handle, fileBuffer.get(), readSize, 1) == 0) {
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return false;
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}
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const std::ptrdiff_t xSkip = bufferPitch - width;
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const std::ptrdiff_t srcSkip = width % 2;
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uint8_t *dataPtr = fileBuffer.get();
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for (int j = 0; j < height; j++) {
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for (int x = 0; x < width;) {
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constexpr std::uint8_t PcxMaxSinglePixel = 0xBF;
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const std::uint8_t byte = *dataPtr++;
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if (byte <= PcxMaxSinglePixel) {
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*buffer++ = byte;
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++x;
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continue;
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}
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constexpr std::uint8_t PcxRunLengthMask = 0x3F;
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const std::uint8_t runLength = (byte & PcxRunLengthMask);
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std::memset(buffer, *dataPtr++, runLength);
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buffer += runLength;
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x += runLength;
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}
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dataPtr += srcSkip;
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buffer += xSkip;
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}
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if (palette != nullptr && bpp == 8) {
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// The file has a 256 color palette that needs to be loaded.
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[[maybe_unused]] constexpr unsigned PcxPaletteSeparator = 0x0C;
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assert(*dataPtr == PcxPaletteSeparator); // sanity check the delimiter
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++dataPtr;
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auto *out = palette;
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for (unsigned i = 0; i < NumPaletteColors; ++i) {
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out->r = *dataPtr++;
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out->g = *dataPtr++;
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out->b = *dataPtr++;
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#ifndef USE_SDL1
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out->a = SDL_ALPHA_OPAQUE;
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#endif
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++out;
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}
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}
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return true;
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}
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} // namespace devilution
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