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J. Nick Koston
de93f2e9ff
Image::draw() iterated columns in the outer loop over a row-major pixel buffer, so every pixel read and every frame buffer write jumped by a full row. Walking rows keeps both accesses sequential regardless of image shape or display rotation. The output is unchanged. Adds a host benchmark for the four pixel formats plus the alpha path.
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
#include <benchmark/benchmark.h>
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#include <cstdint>
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#include <memory>
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#include "esphome/components/display/display_buffer.h"
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#include "esphome/components/image/image.h"
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namespace esphome::image::benchmarks {
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static constexpr int kWidth = 128;
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static constexpr int kHeight = 96;
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// One byte per pixel frame buffer with no hardware behind it, so the
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// measurement is Image::draw() plus the DisplayBuffer pixel path every
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// buffered display shares.
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class BenchDisplay : public display::DisplayBuffer {
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public:
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BenchDisplay() { this->init_internal_(kWidth * kHeight); }
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void update() override {}
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display::DisplayType get_display_type() override { return display::DisplayType::DISPLAY_TYPE_COLOR; }
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int get_width_internal() override { return kWidth; }
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int get_height_internal() override { return kHeight; }
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protected:
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void draw_absolute_pixel_internal(int x, int y, Color color) override {
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this->buffer_[y * kWidth + x] = color.r ^ color.g ^ color.b;
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}
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};
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// Deterministic pseudo random pixel bytes; the values only need to vary so
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// the chroma key and alpha branches see a mix of pixels.
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static std::unique_ptr<uint8_t[]> make_pixels(size_t bytes) {
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auto data = std::make_unique<uint8_t[]>(bytes);
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uint32_t seed = 11897;
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for (size_t i = 0; i < bytes; i++) {
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seed = seed * 1103515245u + 12345u;
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data[i] = static_cast<uint8_t>(seed >> 16);
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}
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return data;
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}
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static void draw_image(benchmark::State &state, ImageType type, Transparency transparency, size_t bytes) {
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auto data = make_pixels(bytes);
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Image image(data.get(), kWidth, kHeight, type, transparency);
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BenchDisplay display;
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for (auto _ : state) {
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image.draw(0, 0, &display, display::COLOR_ON, display::COLOR_OFF);
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benchmark::DoNotOptimize(&display);
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}
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state.SetItemsProcessed(state.iterations() * kWidth * kHeight);
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}
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static void ImageDraw_Binary(benchmark::State &state) {
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draw_image(state, IMAGE_TYPE_BINARY, TRANSPARENCY_OPAQUE, (kWidth + 7) / 8 * kHeight);
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}
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BENCHMARK(ImageDraw_Binary);
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static void ImageDraw_Grayscale(benchmark::State &state) {
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draw_image(state, IMAGE_TYPE_GRAYSCALE, TRANSPARENCY_OPAQUE, kWidth * kHeight);
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}
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BENCHMARK(ImageDraw_Grayscale);
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static void ImageDraw_RGB565(benchmark::State &state) {
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draw_image(state, IMAGE_TYPE_RGB565, TRANSPARENCY_OPAQUE, kWidth * kHeight * 2);
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}
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BENCHMARK(ImageDraw_RGB565);
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static void ImageDraw_RGB(benchmark::State &state) {
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draw_image(state, IMAGE_TYPE_RGB, TRANSPARENCY_OPAQUE, kWidth * kHeight * 3);
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}
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BENCHMARK(ImageDraw_RGB);
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static void ImageDraw_RGB_Alpha(benchmark::State &state) {
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draw_image(state, IMAGE_TYPE_RGB, TRANSPARENCY_ALPHA_CHANNEL, kWidth * kHeight * 4);
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}
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BENCHMARK(ImageDraw_RGB_Alpha);
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} // namespace esphome::image::benchmarks
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