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Code Issues Releases Wiki Activity

Add runtime online image support (#4710)

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guillempages
2024-08-06 13:08:06 +02:00
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parent b0d9800817
commit 9188836f70
15 changed files with 961 additions and 0 deletions
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68
esphome/components/online_image/png_image.cpp Normal file
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#include "png_image.h"
#ifdef USE_ONLINE_IMAGE_PNG_SUPPORT
#include "esphome/components/display/display_buffer.h"
#include "esphome/core/application.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
static const char *const TAG = "online_image.png";
namespace esphome {
namespace online_image {
/**
* @brief Callback method that will be called by the PNGLE engine when the basic
* data of the image is received (i.e. width and height);
*
* @param pngle The PNGLE object, including the context data.
* @param w The width of the image.
* @param h The height of the image.
*/
static void init_callback(pngle_t *pngle, uint32_t w, uint32_t h) {
PngDecoder *decoder = (PngDecoder *) pngle_get_user_data(pngle);
decoder->set_size(w, h);
}
/**
* @brief Callback method that will be called by the PNGLE engine when a chunk
* of the image is decoded.
*
* @param pngle The PNGLE object, including the context data.
* @param x The X coordinate to draw the rectangle on.
* @param y The Y coordinate to draw the rectangle on.
* @param w The width of the rectangle to draw.
* @param h The height of the rectangle to draw.
* @param rgba The color to paint the rectangle in.
*/
static void draw_callback(pngle_t *pngle, uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint8_t rgba[4]) {
PngDecoder *decoder = (PngDecoder *) pngle_get_user_data(pngle);
Color color(rgba[0], rgba[1], rgba[2], rgba[3]);
decoder->draw(x, y, w, h, color);
}
void PngDecoder::prepare(uint32_t download_size) {
ImageDecoder::prepare(download_size);
pngle_set_user_data(this->pngle_, this);
pngle_set_init_callback(this->pngle_, init_callback);
pngle_set_draw_callback(this->pngle_, draw_callback);
}
int HOT PngDecoder::decode(uint8_t *buffer, size_t size) {
if (size < 256 && size < this->download_size_ - this->decoded_bytes_) {
ESP_LOGD(TAG, "Waiting for data");
return 0;
}
auto fed = pngle_feed(this->pngle_, buffer, size);
if (fed < 0) {
ESP_LOGE(TAG, "Error decoding image: %s", pngle_error(this->pngle_));
} else {
this->decoded_bytes_ += fed;
}
return fed;
}
} // namespace online_image
} // namespace esphome
#endif // USE_ONLINE_IMAGE_PNG_SUPPORT