55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
#include "Resource/BitmapImage.h"
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#include "Resource/IJL15Runtime.h"
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#include <cstdlib>
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// OFFSET: 0x0074BCC0
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// FUNCTION: fn_07871
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bool BitmapImage::DecodeJpeg(const void* data, int bytes, IJL15Runtime& runtime) {
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IJL15Properties properties = {};
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if (runtime.initialize(&properties) != 0) {
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return false;
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}
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properties.jpegBytes = const_cast<unsigned char*>(static_cast<const unsigned char*>(data));
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properties.jpegSize = bytes;
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unsigned char* source;
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if (runtime.read(&properties, 1) == 0) {
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this->width = properties.jpegWidth;
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this->height = properties.jpegHeight;
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const std::uint32_t count = static_cast<std::uint32_t>(this->width) * static_cast<std::uint32_t>(this->height);
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source = static_cast<unsigned char*>(std::malloc(count * 3u));
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this->pixels = static_cast<std::uint32_t*>(std::malloc(count > 0x3FFFFFFFu ? 0xFFFFFFFFu : count * 4u));
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properties.dibWidth = this->width;
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properties.dibHeight = this->height;
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properties.dibBytes = source;
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properties.dibColor = 2; // IJL_BGR
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properties.dibChannels = 3;
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properties.dibPadding = 0;
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if (runtime.read(&properties, 3) != 0) {
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std::free(source);
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std::free(this->pixels);
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this->pixels = nullptr;
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// Original returns without ijlFree on this failure branch.
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return false;
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}
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} else {
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// Original falls through with the object itself as the temporary buffer.
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// Keep this observable malformed-input behavior, not an invented false.
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source = reinterpret_cast<unsigned char*>(this);
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}
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runtime.release(&properties);
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for (int y = 0; y < this->height; ++y) {
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const unsigned char* input = source + 3u * (static_cast<std::uint32_t>(y) * this->width);
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if (!input) {
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return false;
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}
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for (int x = 0; x < this->width; ++x, input += 3) {
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const unsigned blue = input[0], green = input[1], red = input[2];
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this->pixels[static_cast<std::uint32_t>(y) * this->width + x] =
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red >= 254 && green <= 3 && blue >= 254 ? 0x000A0A0Au : blue | (green << 8) | (red << 16) | 0xFF000000u;
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}
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}
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std::free(source);
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this->alpha = 0;
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return true;
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}
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