mirror of
https://github.com/esphome/esphome.git
synced 2025-09-14 17:22:20 +01:00
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
#include "image_decoder.h"
|
|
#include "online_image.h"
|
|
|
|
#include "esphome/core/log.h"
|
|
|
|
namespace esphome {
|
|
namespace online_image {
|
|
|
|
static const char *const TAG = "online_image.decoder";
|
|
|
|
bool ImageDecoder::set_size(int width, int height) {
|
|
bool success = this->image_->resize_(width, height) > 0;
|
|
this->x_scale_ = static_cast<double>(this->image_->buffer_width_) / width;
|
|
this->y_scale_ = static_cast<double>(this->image_->buffer_height_) / height;
|
|
return success;
|
|
}
|
|
|
|
void ImageDecoder::draw(int x, int y, int w, int h, const Color &color) {
|
|
auto width = std::min(this->image_->buffer_width_, static_cast<int>(std::ceil((x + w) * this->x_scale_)));
|
|
auto height = std::min(this->image_->buffer_height_, static_cast<int>(std::ceil((y + h) * this->y_scale_)));
|
|
for (int i = x * this->x_scale_; i < width; i++) {
|
|
for (int j = y * this->y_scale_; j < height; j++) {
|
|
this->image_->draw_pixel_(i, j, color);
|
|
}
|
|
}
|
|
}
|
|
|
|
DownloadBuffer::DownloadBuffer(size_t size) : size_(size) {
|
|
this->buffer_ = this->allocator_.allocate(size);
|
|
this->reset();
|
|
if (!this->buffer_) {
|
|
ESP_LOGE(TAG, "Initial allocation of download buffer failed!");
|
|
this->size_ = 0;
|
|
}
|
|
}
|
|
|
|
uint8_t *DownloadBuffer::data(size_t offset) {
|
|
if (offset > this->size_) {
|
|
ESP_LOGE(TAG, "Tried to access beyond download buffer bounds!!!");
|
|
return this->buffer_;
|
|
}
|
|
return this->buffer_ + offset;
|
|
}
|
|
|
|
size_t DownloadBuffer::read(size_t len) {
|
|
this->unread_ -= len;
|
|
if (this->unread_ > 0) {
|
|
memmove(this->data(), this->data(len), this->unread_);
|
|
}
|
|
return this->unread_;
|
|
}
|
|
|
|
size_t DownloadBuffer::resize(size_t size) {
|
|
if (this->size_ >= size) {
|
|
// Avoid useless reallocations; if the buffer is big enough, don't reallocate.
|
|
return this->size_;
|
|
}
|
|
this->allocator_.deallocate(this->buffer_, this->size_);
|
|
this->buffer_ = this->allocator_.allocate(size);
|
|
this->reset();
|
|
if (this->buffer_) {
|
|
this->size_ = size;
|
|
return size;
|
|
} else {
|
|
ESP_LOGE(TAG, "allocation of %zu bytes failed. Biggest block in heap: %zu Bytes", size,
|
|
this->allocator_.get_max_free_block_size());
|
|
this->size_ = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
} // namespace online_image
|
|
} // namespace esphome
|