mirror of
https://github.com/daveallie/crosspoint-reader.git
synced 2026-02-05 07:07:38 +03:00
fbda7aa4f1
- Add 1-bit BMP generation with Atkinson dithering for better quality thumbnails - Replace noise dithering with error diffusion for smoother gradients - Add fillPolygon() to GfxRenderer for proper bookmark ribbon shape - Change bookmark from rect+triangle carve to pentagon polygon - Fix bookmark inversion when Continue Reading card is selected - Show selection state on first render (not just after navigation) - Fix 1-bit BMP palette lookup in Bitmap::readRow() - Add drawBitmap1Bit() optimized path for 1-bit BMPs The 1-bit format eliminates gray passes on home screen for faster rendering while Atkinson dithering maintains good image quality through error diffusion.
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
#pragma once
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#include <SdFat.h>
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enum class BmpReaderError : uint8_t {
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Ok = 0,
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FileInvalid,
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SeekStartFailed,
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NotBMP,
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DIBTooSmall,
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BadPlanes,
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UnsupportedBpp,
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UnsupportedCompression,
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BadDimensions,
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ImageTooLarge,
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PaletteTooLarge,
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SeekPixelDataFailed,
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BufferTooSmall,
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OomRowBuffer,
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ShortReadRow,
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};
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class Bitmap {
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public:
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static const char* errorToString(BmpReaderError err);
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explicit Bitmap(FsFile& file) : file(file) {}
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~Bitmap();
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BmpReaderError parseHeaders();
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BmpReaderError readRow(uint8_t* data, uint8_t* rowBuffer, int rowY) const;
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BmpReaderError rewindToData() const;
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int getWidth() const { return width; }
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int getHeight() const { return height; }
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bool isTopDown() const { return topDown; }
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bool hasGreyscale() const { return bpp > 1; }
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int getRowBytes() const { return rowBytes; }
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bool is1Bit() const { return bpp == 1; }
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uint16_t getBpp() const { return bpp; }
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private:
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static uint16_t readLE16(FsFile& f);
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static uint32_t readLE32(FsFile& f);
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FsFile& file;
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int width = 0;
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int height = 0;
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bool topDown = false;
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uint32_t bfOffBits = 0;
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uint16_t bpp = 0;
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int rowBytes = 0;
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uint8_t paletteLum[256] = {};
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// Floyd-Steinberg dithering state (mutable for const methods)
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mutable int16_t* errorCurRow = nullptr;
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mutable int16_t* errorNextRow = nullptr;
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mutable int lastRowY = -1; // Track row progression for error propagation
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};
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