374 lines
12 KiB
C++
374 lines
12 KiB
C++
#include "Bitmap.h"
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#include <cstdlib>
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#include <cstring>
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// ============================================================================
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// IMAGE PROCESSING OPTIONS - Toggle these to test different configurations
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// ============================================================================
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// Note: For cover images, dithering is done in JpegToBmpConverter.cpp
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// This file handles BMP reading - use simple quantization to avoid double-dithering
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constexpr bool USE_ATKINSON = true; // Use Atkinson dithering instead of Floyd-Steinberg
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// ============================================================================
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Bitmap::~Bitmap() {
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delete[] errorCurRow;
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delete[] errorNextRow;
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delete atkinsonDitherer;
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delete fsDitherer;
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}
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uint16_t Bitmap::readLE16(FsFile& f) {
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const int c0 = f.read();
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const int c1 = f.read();
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const auto b0 = static_cast<uint8_t>(c0 < 0 ? 0 : c0);
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const auto b1 = static_cast<uint8_t>(c1 < 0 ? 0 : c1);
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return static_cast<uint16_t>(b0) | (static_cast<uint16_t>(b1) << 8);
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}
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uint32_t Bitmap::readLE32(FsFile& f) {
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const int c0 = f.read();
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const int c1 = f.read();
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const int c2 = f.read();
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const int c3 = f.read();
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const auto b0 = static_cast<uint8_t>(c0 < 0 ? 0 : c0);
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const auto b1 = static_cast<uint8_t>(c1 < 0 ? 0 : c1);
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const auto b2 = static_cast<uint8_t>(c2 < 0 ? 0 : c2);
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const auto b3 = static_cast<uint8_t>(c3 < 0 ? 0 : c3);
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return static_cast<uint32_t>(b0) | (static_cast<uint32_t>(b1) << 8) | (static_cast<uint32_t>(b2) << 16) |
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(static_cast<uint32_t>(b3) << 24);
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}
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const char* Bitmap::errorToString(BmpReaderError err) {
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switch (err) {
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case BmpReaderError::Ok:
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return "Ok";
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case BmpReaderError::FileInvalid:
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return "FileInvalid";
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case BmpReaderError::SeekStartFailed:
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return "SeekStartFailed";
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case BmpReaderError::NotBMP:
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return "NotBMP (missing 'BM')";
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case BmpReaderError::DIBTooSmall:
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return "DIBTooSmall (<40 bytes)";
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case BmpReaderError::BadPlanes:
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return "BadPlanes (!= 1)";
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case BmpReaderError::UnsupportedBpp:
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return "UnsupportedBpp (expected 1, 2, 8, 24, or 32)";
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case BmpReaderError::UnsupportedCompression:
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return "UnsupportedCompression (expected BI_RGB or BI_BITFIELDS for 32bpp)";
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case BmpReaderError::BadDimensions:
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return "BadDimensions";
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case BmpReaderError::ImageTooLarge:
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return "ImageTooLarge (max 2048x3072)";
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case BmpReaderError::PaletteTooLarge:
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return "PaletteTooLarge";
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case BmpReaderError::SeekPixelDataFailed:
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return "SeekPixelDataFailed";
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case BmpReaderError::BufferTooSmall:
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return "BufferTooSmall";
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case BmpReaderError::OomRowBuffer:
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return "OomRowBuffer";
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case BmpReaderError::ShortReadRow:
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return "ShortReadRow";
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}
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return "Unknown";
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}
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BmpReaderError Bitmap::parseHeaders() {
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if (!file) return BmpReaderError::FileInvalid;
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// Store file size for cache validation
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fileSize = file.size();
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if (!file.seek(0)) return BmpReaderError::SeekStartFailed;
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// --- BMP FILE HEADER ---
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const uint16_t bfType = readLE16(file);
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if (bfType != 0x4D42) return BmpReaderError::NotBMP;
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file.seekCur(8);
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bfOffBits = readLE32(file);
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// --- DIB HEADER ---
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const uint32_t biSize = readLE32(file);
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if (biSize < 40) return BmpReaderError::DIBTooSmall;
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width = static_cast<int32_t>(readLE32(file));
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const auto rawHeight = static_cast<int32_t>(readLE32(file));
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topDown = rawHeight < 0;
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height = topDown ? -rawHeight : rawHeight;
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const uint16_t planes = readLE16(file);
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bpp = readLE16(file);
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const uint32_t comp = readLE32(file);
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const bool validBpp = bpp == 1 || bpp == 2 || bpp == 8 || bpp == 24 || bpp == 32;
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if (planes != 1) return BmpReaderError::BadPlanes;
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if (!validBpp) return BmpReaderError::UnsupportedBpp;
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// Allow BI_RGB (0) for all, and BI_BITFIELDS (3) for 32bpp which is common for BGRA masks.
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if (!(comp == 0 || (bpp == 32 && comp == 3))) return BmpReaderError::UnsupportedCompression;
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file.seekCur(12); // biSizeImage, biXPelsPerMeter, biYPelsPerMeter
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const uint32_t colorsUsed = readLE32(file);
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if (colorsUsed > 256u) return BmpReaderError::PaletteTooLarge;
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file.seekCur(4); // biClrImportant
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if (width <= 0 || height <= 0) return BmpReaderError::BadDimensions;
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// Safety limits to prevent memory issues on ESP32
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constexpr int MAX_IMAGE_WIDTH = 2048;
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constexpr int MAX_IMAGE_HEIGHT = 3072;
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if (width > MAX_IMAGE_WIDTH || height > MAX_IMAGE_HEIGHT) {
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return BmpReaderError::ImageTooLarge;
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}
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// Pre-calculate Row Bytes to avoid doing this every row
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rowBytes = (width * bpp + 31) / 32 * 4;
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for (int i = 0; i < 256; i++) paletteLum[i] = static_cast<uint8_t>(i);
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if (colorsUsed > 0) {
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for (uint32_t i = 0; i < colorsUsed; i++) {
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uint8_t rgb[4];
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file.read(rgb, 4); // Read B, G, R, Reserved in one go
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paletteLum[i] = (77u * rgb[2] + 150u * rgb[1] + 29u * rgb[0]) >> 8;
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}
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}
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if (!file.seek(bfOffBits)) {
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return BmpReaderError::SeekPixelDataFailed;
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}
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// Create ditherer if enabled (only for 2-bit output)
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// Use OUTPUT dimensions for dithering (after prescaling)
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if (bpp > 2 && dithering) {
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if (USE_ATKINSON) {
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atkinsonDitherer = new AtkinsonDitherer(width);
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} else {
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fsDitherer = new FloydSteinbergDitherer(width);
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}
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}
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return BmpReaderError::Ok;
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}
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// packed 2bpp output, 0 = black, 1 = dark gray, 2 = light gray, 3 = white
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BmpReaderError Bitmap::readNextRow(uint8_t* data, uint8_t* rowBuffer) const {
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// Note: rowBuffer should be pre-allocated by the caller to size 'rowBytes'
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if (file.read(rowBuffer, rowBytes) != rowBytes) return BmpReaderError::ShortReadRow;
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prevRowY += 1;
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uint8_t* outPtr = data;
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uint8_t currentOutByte = 0;
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int bitShift = 6;
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int currentX = 0;
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// Helper lambda to pack 2bpp color into the output stream
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auto packPixel = [&](const uint8_t lum) {
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uint8_t color;
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if (atkinsonDitherer) {
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color = atkinsonDitherer->processPixel(adjustPixel(lum), currentX);
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} else if (fsDitherer) {
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color = fsDitherer->processPixel(adjustPixel(lum), currentX);
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} else {
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if (bpp > 2) {
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// Simple quantization or noise dithering
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color = quantize(adjustPixel(lum), currentX, prevRowY);
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} else {
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// do not quantize 2bpp image
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color = static_cast<uint8_t>(lum >> 6);
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}
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}
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currentOutByte |= (color << bitShift);
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if (bitShift == 0) {
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*outPtr++ = currentOutByte;
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currentOutByte = 0;
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bitShift = 6;
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} else {
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bitShift -= 2;
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}
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currentX++;
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};
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uint8_t lum;
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switch (bpp) {
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case 32: {
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const uint8_t* p = rowBuffer;
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for (int x = 0; x < width; x++) {
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lum = (77u * p[2] + 150u * p[1] + 29u * p[0]) >> 8;
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packPixel(lum);
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p += 4;
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}
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break;
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}
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case 24: {
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const uint8_t* p = rowBuffer;
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for (int x = 0; x < width; x++) {
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lum = (77u * p[2] + 150u * p[1] + 29u * p[0]) >> 8;
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packPixel(lum);
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p += 3;
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}
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break;
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}
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case 8: {
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for (int x = 0; x < width; x++) {
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packPixel(paletteLum[rowBuffer[x]]);
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}
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break;
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}
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case 2: {
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for (int x = 0; x < width; x++) {
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lum = paletteLum[(rowBuffer[x >> 2] >> (6 - ((x & 3) * 2))) & 0x03];
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packPixel(lum);
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}
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break;
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}
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case 1: {
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for (int x = 0; x < width; x++) {
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// Get palette index (0 or 1) from bit at position x
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const uint8_t palIndex = (rowBuffer[x >> 3] & (0x80 >> (x & 7))) ? 1 : 0;
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// Use palette lookup for proper black/white mapping
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lum = paletteLum[palIndex];
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packPixel(lum);
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}
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break;
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}
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default:
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return BmpReaderError::UnsupportedBpp;
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}
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if (atkinsonDitherer)
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atkinsonDitherer->nextRow();
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else if (fsDitherer)
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fsDitherer->nextRow();
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// Flush remaining bits if width is not a multiple of 4
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if (bitShift != 6) *outPtr = currentOutByte;
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return BmpReaderError::Ok;
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}
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BmpReaderError Bitmap::rewindToData() const {
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if (!file.seek(bfOffBits)) {
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return BmpReaderError::SeekPixelDataFailed;
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}
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// Reset dithering when rewinding
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if (fsDitherer) fsDitherer->reset();
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if (atkinsonDitherer) atkinsonDitherer->reset();
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return BmpReaderError::Ok;
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}
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EdgeLuminance Bitmap::detectEdgeLuminance(int depth) const {
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// Detect average luminance for each edge of the image.
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// Samples 'depth' pixels from each edge for more stable averages.
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// Returns per-edge luminance values (0-255).
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EdgeLuminance result = {128, 128, 128, 128}; // Default to neutral gray
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if (width <= 0 || height <= 0) return result;
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if (depth < 1) depth = 1;
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if (depth > width / 2) depth = width / 2;
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if (depth > height / 2) depth = height / 2;
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auto* rowBuffer = static_cast<uint8_t*>(malloc(rowBytes));
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if (!rowBuffer) return result;
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// Accumulators for each edge
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uint32_t topSum = 0, bottomSum = 0, leftSum = 0, rightSum = 0;
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int topCount = 0, bottomCount = 0, leftCount = 0, rightCount = 0;
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// Helper lambda to get luminance from a pixel at position x in rowBuffer
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auto getLuminance = [&](int x) -> uint8_t {
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switch (bpp) {
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case 32: {
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const uint8_t* p = rowBuffer + x * 4;
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return (77u * p[2] + 150u * p[1] + 29u * p[0]) >> 8;
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}
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case 24: {
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const uint8_t* p = rowBuffer + x * 3;
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return (77u * p[2] + 150u * p[1] + 29u * p[0]) >> 8;
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}
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case 8:
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return paletteLum[rowBuffer[x]];
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case 2:
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return paletteLum[(rowBuffer[x >> 2] >> (6 - ((x & 3) * 2))) & 0x03];
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case 1: {
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const uint8_t palIndex = (rowBuffer[x >> 3] & (0x80 >> (x & 7))) ? 1 : 0;
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return paletteLum[palIndex];
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}
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default:
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return 128; // Neutral if unsupported
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}
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};
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// Helper to seek to a specific image row (accounting for top-down vs bottom-up)
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auto seekToRow = [&](int imageRow) -> bool {
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// In bottom-up BMP (topDown=false), row 0 in file is the bottom row of image
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// In top-down BMP (topDown=true), row 0 in file is the top row of image
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int fileRow = topDown ? imageRow : (height - 1 - imageRow);
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return file.seek(bfOffBits + static_cast<uint32_t>(fileRow) * rowBytes);
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};
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// Sample top rows (image rows 0 to depth-1) - all pixels
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for (int row = 0; row < depth && row < height; row++) {
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if (seekToRow(row) && file.read(rowBuffer, rowBytes) == rowBytes) {
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for (int x = 0; x < width; x++) {
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topSum += getLuminance(x);
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topCount++;
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}
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}
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}
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// Sample bottom rows (image rows height-depth to height-1) - all pixels
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for (int row = height - depth; row < height; row++) {
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if (row >= depth && row >= 0) { // Avoid overlap with top rows
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if (seekToRow(row) && file.read(rowBuffer, rowBytes) == rowBytes) {
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for (int x = 0; x < width; x++) {
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bottomSum += getLuminance(x);
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bottomCount++;
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}
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}
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}
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}
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// Sample left and right edges from all rows
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for (int y = 0; y < height; y++) {
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if (seekToRow(y) && file.read(rowBuffer, rowBytes) == rowBytes) {
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// Left edge (first 'depth' pixels)
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for (int x = 0; x < depth && x < width; x++) {
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leftSum += getLuminance(x);
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leftCount++;
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}
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// Right edge (last 'depth' pixels)
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for (int x = width - depth; x < width; x++) {
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if (x >= depth) { // Avoid overlap with left edge
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rightSum += getLuminance(x);
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rightCount++;
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}
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}
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}
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}
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free(rowBuffer);
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// Calculate averages
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if (topCount > 0) result.top = static_cast<uint8_t>(topSum / topCount);
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if (bottomCount > 0) result.bottom = static_cast<uint8_t>(bottomSum / bottomCount);
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if (leftCount > 0) result.left = static_cast<uint8_t>(leftSum / leftCount);
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if (rightCount > 0) result.right = static_cast<uint8_t>(rightSum / rightCount);
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// Rewind file position for subsequent drawing
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rewindToData();
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return result;
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}
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