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## Summary - When allocating the `bwBuffer` required to restore the RED RAM in the EPD, we were previously allocating the whole frame buffer in one contiguous memory chunk (48kB) - Depending on the state of memory fragmentation at the time of this call, it may not be possible to allocate all that memory - Instead, we now allocate 6 blocks of 8kB instead of the full 48kB, this should mean the display updates are more resilient to different memory conditions ## Additional Context
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
#pragma once
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#include <EInkDisplay.h>
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#include <EpdFontFamily.h>
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#include <map>
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class GfxRenderer {
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public:
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enum RenderMode { BW, GRAYSCALE_LSB, GRAYSCALE_MSB };
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private:
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static constexpr size_t BW_BUFFER_CHUNK_SIZE = 8000; // 8KB chunks to allow for non-contiguous memory
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static constexpr size_t BW_BUFFER_NUM_CHUNKS = EInkDisplay::BUFFER_SIZE / BW_BUFFER_CHUNK_SIZE;
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static_assert(BW_BUFFER_CHUNK_SIZE * BW_BUFFER_NUM_CHUNKS == EInkDisplay::BUFFER_SIZE,
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"BW buffer chunking does not line up with display buffer size");
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EInkDisplay& einkDisplay;
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RenderMode renderMode;
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uint8_t* bwBufferChunks[BW_BUFFER_NUM_CHUNKS] = {nullptr};
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std::map<int, EpdFontFamily> fontMap;
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void renderChar(const EpdFontFamily& fontFamily, uint32_t cp, int* x, const int* y, bool pixelState,
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EpdFontStyle style) const;
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void freeBwBufferChunks();
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public:
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explicit GfxRenderer(EInkDisplay& einkDisplay) : einkDisplay(einkDisplay), renderMode(BW) {}
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~GfxRenderer() = default;
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// Setup
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void insertFont(int fontId, EpdFontFamily font);
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// Screen ops
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static int getScreenWidth();
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static int getScreenHeight();
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void displayBuffer(EInkDisplay::RefreshMode refreshMode = EInkDisplay::FAST_REFRESH) const;
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// EXPERIMENTAL: Windowed update - display only a rectangular region (portrait coordinates)
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void displayWindow(int x, int y, int width, int height) const;
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void invertScreen() const;
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void clearScreen(uint8_t color = 0xFF) const;
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// Drawing
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void drawPixel(int x, int y, bool state = true) const;
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void drawLine(int x1, int y1, int x2, int y2, bool state = true) const;
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void drawRect(int x, int y, int width, int height, bool state = true) const;
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void fillRect(int x, int y, int width, int height, bool state = true) const;
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void drawImage(const uint8_t bitmap[], int x, int y, int width, int height) const;
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// Text
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int getTextWidth(int fontId, const char* text, EpdFontStyle style = REGULAR) const;
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void drawCenteredText(int fontId, int y, const char* text, bool black = true, EpdFontStyle style = REGULAR) const;
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void drawText(int fontId, int x, int y, const char* text, bool black = true, EpdFontStyle style = REGULAR) const;
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int getSpaceWidth(int fontId) const;
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int getLineHeight(int fontId) const;
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// Grayscale functions
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void setRenderMode(const RenderMode mode) { this->renderMode = mode; }
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void copyGrayscaleLsbBuffers() const;
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void copyGrayscaleMsbBuffers() const;
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void displayGrayBuffer() const;
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void storeBwBuffer();
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void restoreBwBuffer();
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// Low level functions
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uint8_t* getFrameBuffer() const;
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static size_t getBufferSize();
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void grayscaleRevert() const;
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};
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