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Benchmark the opaque RGB565 draw on a display with a bulk path

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This commit is contained in:
J. Nick Koston
2026-09-17 19:02:40 -05:00
parent 30e8b8379c
commit 2da55e1f65
1 changed files with 35 additions and 0 deletions
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tests/benchmarks/components/image/bench_image_draw.cpp
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@@ -1,6 +1,7 @@
#include <benchmark/benchmark.h>
#include <cstdint>
#include <cstring>
#include <memory>
#include "esphome/components/display/display_buffer.h"
@@ -34,6 +35,28 @@ class BenchDisplay : public display::DisplayBuffer {
uint8_t pixel(int x, int y) const { return this->frame_[y * kStride + x]; }
};
// Models a driver with a bulk path: rows of little endian RGB565 are copied
// straight into a 16 bit frame, as the TFT drivers do for their own format.
class BulkBenchDisplay : public BenchDisplay {
public:
BulkBenchDisplay() : frame565_(std::make_unique<uint16_t[]>(kStride * kStride)) {}
void draw_pixels_at(int x_start, int y_start, int w, int h, const uint8_t *ptr, display::ColorOrder order,
display::ColorBitness bitness, bool big_endian, int x_offset, int y_offset, int x_pad) override {
if (bitness != display::COLOR_BITNESS_565 || big_endian) {
BenchDisplay::draw_pixels_at(x_start, y_start, w, h, ptr, order, bitness, big_endian, x_offset, y_offset, x_pad);
return;
}
const size_t stride = x_offset + w + x_pad;
for (int y = 0; y < h; y++) {
memcpy(this->frame565_.get() + (y_start + y) * kStride + x_start, ptr + ((y_offset + y) * stride + x_offset) * 2,
w * 2);
}
}
protected:
std::unique_ptr<uint16_t[]> frame565_;
};
// Draws the image at rotation 0 and 90 and checks the second frame is the
// transpose of the first, which is what a wrong traversal order would break.
static bool frames_match(const Image &image) {
@@ -96,6 +119,18 @@ BENCHMARK(ImageDraw_RGB565);
static void ImageDraw_RGB(benchmark::State &state) { draw_image(state, IMAGE_TYPE_RGB, TRANSPARENCY_OPAQUE); }
BENCHMARK(ImageDraw_RGB);
// The same opaque RGB565 image on a display with a bulk path.
static void ImageDraw_RGB565_Bulk(benchmark::State &state) {
auto data = make_pixels();
Image image(data.get(), kWidth, kHeight, IMAGE_TYPE_RGB565, TRANSPARENCY_OPAQUE);
BulkBenchDisplay display;
for (auto _ : state) {
image.draw(0, 0, &display, display::COLOR_ON, display::COLOR_OFF);
}
state.SetItemsProcessed(state.iterations() * kWidth * kHeight);
}
BENCHMARK(ImageDraw_RGB565_Bulk);
static void ImageDraw_RGB_Rotated(benchmark::State &state) {
draw_image(state, IMAGE_TYPE_RGB, TRANSPARENCY_OPAQUE, display::DISPLAY_ROTATION_90_DEGREES);
}