Examples/spi_master: spiffier graphics

examples/peripherals/spi_master/main/decode_image.h

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+#pragma once
+#include <stdint.h>
+#include "esp_err.h"
+
+/**
+ * @brief Decode the jpeg ``image.jpg`` embedded into the program file into pixel data.
+ *
+ * @param pixels A pointer to a pointer for an array of rows, which themselves are an array of pixels.
+ *        Effectively, you can get the pixel data by doing ``decode_image(&myPixels); pixelval=myPixels[ypos][xpos];``
+ * @return - ESP_ERR_NOT_SUPPORTED if image is malformed or a progressive jpeg file
+ *         - ESP_ERR_NO_MEM if out of memory
+ *         - ESP_OK on succesful decode
+ */
+esp_err_t decode_image(uint16_t ***pixels);