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// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_display/display.h"
#include <utility>
#include "pw_assert/assert.h"
#include "pw_color/color.h"
#include "pw_framebuffer/framebuffer.h"
#include "pw_framebuffer_pool/framebuffer_pool.h"
#include "pw_status/try.h"
using pw::color::color_rgb565_t;
using pw::framebuffer::Framebuffer;
using pw::framebuffer::PixelFormat;
namespace pw::display {
Display::Display(pw::display_driver::DisplayDriver& display_driver,
pw::math::Size<uint16_t> size,
pw::framebuffer_pool::FramebufferPool& framebuffer_pool)
: display_driver_(display_driver),
size_(size),
framebuffer_pool_(framebuffer_pool) {}
Display::~Display() = default;
#if DISPLAY_RESIZE
Status Display::UpdateNearestNeighbor(const Framebuffer& framebuffer) {
PW_ASSERT(framebuffer.is_valid());
if (!framebuffer.size().width || !framebuffer.size().height)
return Status::Internal();
const int fb_last_row_idx = framebuffer.size().height - 1;
const int fb_last_col_idx = framebuffer.size().width - 1;
constexpr int kResizeBufferNumPixels = 80;
color_rgb565_t resize_buffer[kResizeBufferNumPixels];
const color_rgb565_t* fbdata =
static_cast<const color_rgb565_t*>(framebuffer.data());
constexpr int kBytesPerPixel = sizeof(color_rgb565_t);
const int num_src_row_pixels = framebuffer.row_bytes() / kBytesPerPixel;
const int num_dst_rows = size_.height;
const int num_dst_cols = size_.width;
for (int dst_row_idx = 0; dst_row_idx < num_dst_rows; dst_row_idx++) {
int src_row_idx = dst_row_idx * fb_last_row_idx / (num_dst_rows - 1);
PW_ASSERT(src_row_idx >= 0);
PW_ASSERT(src_row_idx < framebuffer.size().height);
int next_buff_idx = 0;
int dst_col_write_idx = 0;
for (int dst_col_idx = 0; dst_col_idx < num_dst_cols; dst_col_idx++) {
int src_col_idx = dst_col_idx * fb_last_col_idx / (num_dst_cols - 1);
PW_ASSERT(src_col_idx >= 0);
PW_ASSERT(src_col_idx < framebuffer.size().width);
int src_pixel_idx = src_row_idx * num_src_row_pixels + src_col_idx;
resize_buffer[next_buff_idx++] = fbdata[src_pixel_idx];
if (next_buff_idx == kResizeBufferNumPixels) {
// Buffer is full, flush it.
PW_TRY(display_driver_.WriteRow(
span(resize_buffer, kResizeBufferNumPixels),
dst_row_idx,
dst_col_write_idx));
next_buff_idx = 0;
dst_col_write_idx += kResizeBufferNumPixels;
}
}
if (next_buff_idx) {
// Pixels in buffer, flush them.
PW_TRY(display_driver_.WriteRow(
span(resize_buffer, next_buff_idx), dst_row_idx, dst_col_write_idx));
}
}
return OkStatus();
}
#endif // DISPLAY_RESIZE
Framebuffer Display::GetFramebuffer() {
return framebuffer_pool_.GetFramebuffer();
}
// This may be async
Status Display::ReleaseFramebuffer(Framebuffer framebuffer) {
pw::framebuffer_pool::FramebufferPool& fb_pool = framebuffer_pool_;
auto write_cb = [&fb_pool](pw::framebuffer::Framebuffer fb, Status status) {
PW_ASSERT_OK(status);
fb_pool.ReleaseFramebuffer(std::move(fb));
};
if (!framebuffer.is_valid())
return Status::InvalidArgument();
if (framebuffer.size() != size_) {
#if DISPLAY_RESIZE
if (display_driver_.SupportsResize()) {
display_driver_.WriteFramebuffer(std::move(framebuffer), write_cb);
return OkStatus();
} else {
Status result = UpdateNearestNeighbor(framebuffer);
write_cb(std::move(framebuffer), result);
return result;
}
#endif
// Rely on display driver's ability to support size mismatch. It is
// expected to return an error if it cannot.
}
display_driver_.WriteFramebuffer(std::move(framebuffer), write_cb);
return OkStatus();
}
} // namespace pw::display