generated from Projetos/RaspberryPi_app
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
// linux_fb_display.h — GfxCanvas subclass for Linux framebuffer devices.
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//
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// Supports XRGB8888 (32 bpp), RGB565 (16 bpp), and 8-bit grayscale.
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// Uses mmap for zero-copy access to the kernel framebuffer.
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#ifndef LINUX_FB_DISPLAY_H
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#define LINUX_FB_DISPLAY_H
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#include "gfx_canvas.h"
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#include <cstdint>
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#include <linux/fb.h>
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namespace gfx {
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class LinuxFBDisplay : public GfxCanvas {
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public:
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// Construct with the physical panel dimensions.
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LinuxFBDisplay(int16_t width, int16_t height);
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~LinuxFBDisplay() override;
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// Open the framebuffer device. Returns true on success.
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[[nodiscard]] bool open(const char* device);
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// Release the mmap and close the file descriptor.
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void close();
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// Is the framebuffer currently open and mapped?
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bool isOpen() const { return buf_ != nullptr; }
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protected:
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// Mandatory HAL: single pixel write.
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void drawPixelImpl(int16_t x, int16_t y, Color color) override;
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// Accelerated HAL overrides.
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void drawHLineImpl(int16_t x, int16_t y, int16_t w, Color color) override;
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void drawVLineImpl(int16_t x, int16_t y, int16_t h, Color color) override;
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void fillRectImpl(int16_t x, int16_t y,
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int16_t w, int16_t h, Color color) override;
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private:
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int fd_ = -1;
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uint8_t* buf_ = nullptr;
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size_t map_size_ = 0;
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uint32_t bpp_ = 0;
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uint32_t line_len_ = 0;
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fb_var_screeninfo vinfo_{};
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fb_fix_screeninfo finfo_{};
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// Convert XRGB8888 color to the native pixel value for this fb.
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// Returns the value and its byte width.
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void writePixel(uint8_t* dst, Color color) const;
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};
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} // namespace gfx
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#endif // LINUX_FB_DISPLAY_H
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