squeezelite-esp32/components/display/core/gds_image.h

/* 
 * (c) Philippe G. 2019, philippe_44@outlook.com
 *
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 * 
 */
 
#pragma once

#include <stdint.h>
#include "esp_err.h"

// no progressive JPEG handling

struct GDS_Device;

// Fit options for GDS_DrawJPEG
#define GDS_IMAGE_LEFT		0x00
#define GDS_IMAGE_CENTER_X	0x01
#define GDS_IMAGE_RIGHT		0x04
#define GDS_IMAGE_TOP		0x00
#define GDS_IMAGE_BOTTOM	0x08
#define GDS_IMAGE_CENTER_Y	0x02
#define GDS_IMAGE_CENTER	(GDS_IMAGE_CENTER_X | GDS_IMAGE_CENTER_Y)
#define GDS_IMAGE_FIT		0x10	// re-scale by a factor of 2^N (up to 3)

// Width and Height can be NULL if you already know them (actual scaling is closest ^2)
void*	 	GDS_DecodeJPEG(uint8_t *Source, int *Width, int *Height, float Scale, int RGB_Mode);	// can be 8, 16 or 24 bits per pixel in return
void	 	GDS_GetJPEGSize(uint8_t *Source, int *Width, int *Height);
bool 		GDS_DrawJPEG( struct GDS_Device* Device, uint8_t *Source, int x, int y, int Fit);	
void 		GDS_DrawRGB( struct GDS_Device* Device, uint8_t *Image, int x, int y, int Width, int Height, int RGB_Mode );