366 lines
14 KiB
C
366 lines
14 KiB
C
/*
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* This file is subject to the terms of the GFX License, v1.0. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://chibios-gfx.com/license.html
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*/
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/**
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* @file include/gdisp/image.h
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* @brief GDISP image header file.
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*
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* @defgroup Image Image
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* @ingroup GDISP
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* @{
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*/
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#ifndef _GDISP_IMAGE_H
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#define _GDISP_IMAGE_H
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#if (GFX_USE_GDISP && GDISP_NEED_IMAGE) || defined(__DOXYGEN__)
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/**
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* @brief The type of image
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*/
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typedef uint16_t gdispImageType;
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#define GDISP_IMAGE_TYPE_UNKNOWN 0
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#define GDISP_IMAGE_TYPE_NATIVE 1
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#define GDISP_IMAGE_TYPE_GIF 2
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#define GDISP_IMAGE_TYPE_BMP 3
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#define GDISP_IMAGE_TYPE_JPG 4
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#define GDISP_IMAGE_TYPE_PNG 5
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/**
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* @brief An image error code
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*/
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typedef uint16_t gdispImageError;
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#define GDISP_IMAGE_ERR_OK 0
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#define GDISP_IMAGE_ERR_UNRECOVERABLE 0x8000
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#define GDISP_IMAGE_ERR_BADFORMAT (GDISP_IMAGE_ERR_UNRECOVERABLE+1)
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#define GDISP_IMAGE_ERR_BADDATA (GDISP_IMAGE_ERR_UNRECOVERABLE+2)
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#define GDISP_IMAGE_ERR_UNSUPPORTED (GDISP_IMAGE_ERR_UNRECOVERABLE+3)
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#define GDISP_IMAGE_ERR_UNSUPPORTED_OK 3
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#define GDISP_IMAGE_ERR_NOMEMORY (GDISP_IMAGE_ERR_UNRECOVERABLE+4)
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/**
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* @brief Image flags
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*/
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typedef uint16_t gdispImageFlags;
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#define GDISP_IMAGE_FLG_TRANSPARENT 0x0001 /* The image has transparency */
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#define GDISP_IMAGE_FLG_ANIMATED 0x0002 /* The image has animation */
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#define GDISP_IMAGE_FLG_MULTIPAGE 0x0004 /* The image has multiple pages */
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struct gdispImageIO;
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/**
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* @brief An image IO close function
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*
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* @param[in] pio Pointer to the io structure
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* @param[in] desc The descriptor. A filename or an image structure pointer.
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*
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*/
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typedef void (*gdispImageIOCloseFn)(struct gdispImageIO *pio);
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/**
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* @brief An image IO read function
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* @returns The number of bytes actually read or 0 on error
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*
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* @param[in] pio Pointer to the io structure
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* @param[in] buf Where the results should be placed
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* @param[in] len The number of bytes to read
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*
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*/
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typedef size_t (*gdispImageIOReadFn)(struct gdispImageIO *pio, void *buf, size_t len);
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/**
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* @brief An image IO seek function
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*
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* @param[in] pio Pointer to the io structure
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* @param[in] pos Which byte to seek to relative to the start of the "file".
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*
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*/
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typedef void (*gdispImageIOSeekFn)(struct gdispImageIO *pio, size_t pos);
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typedef struct gdispImageIOFunctions {
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gdispImageIOReadFn read; /* @< The function to read input */
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gdispImageIOSeekFn seek; /* @< The function to seek input */
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gdispImageIOCloseFn close; /* @< The function to close input */
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} gdispImageIOFunctions;
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/**
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* @brief The structure defining the IO routines for image handling
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*/
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typedef struct gdispImageIO {
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const void * fd; /* @< The "file" descriptor */
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size_t pos; /* @< The current "file" position */
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const gdispImageIOFunctions *fns; /* @< The current "file" functions */
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} gdispImageIO;
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/**
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* @brief The structure for an image
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*/
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typedef struct gdispImage {
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gdispImageType type; /* @< The image type */
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gdispImageFlags flags; /* @< The image flags */
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color_t bgcolor; /* @< The default background color */
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coord_t width, height; /* @< The image dimensions */
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gdispImageIO io; /* @< The image IO functions */
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#if GDISP_NEED_IMAGE_ACCOUNTING
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uint32_t memused; /* @< How much RAM is currently allocated */
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uint32_t maxmemused; /* @< How much RAM has been allocated (maximum) */
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#endif
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const struct gdispImageHandlers * fns; /* @< Don't mess with this! */
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struct gdispImagePrivate * priv; /* @< Don't mess with this! */
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} gdispImage;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Sets the io fields in the image structure to routines
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* that support reading from an image stored in RAM or Flash.
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*
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* @return TRUE if the IO open function succeeds
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*
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* @param[in] img The image structure
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* @param[in] memimage A pointer to the image in RAM or Flash
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*
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* @note Always returns TRUE for a Memory Reader
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*/
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bool_t gdispImageSetMemoryReader(gdispImage *img, const void *memimage);
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#if GFX_USE_OS_CHIBIOS || defined(__DOXYGEN__)
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/**
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* @brief Sets the io fields in the image structure to routines
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* that support reading from an image stored on a BaseFileStream (eg SDCard).
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*
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* @return TRUE if the IO open function succeeds
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*
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* @param[in] img The image structure
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* @param[in] BaseFileStreamPtr A pointer to the (open) BaseFileStream object.
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*
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*/
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bool_t gdispImageSetBaseFileStreamReader(gdispImage *img, void *BaseFileStreamPtr);
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#endif
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#if defined(WIN32) || GFX_USE_OS_WIN32 || GFX_USE_OS_POSIX || defined(__DOXYGEN__)
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/**
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* @brief Sets the io fields in the image structure to routines
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* that support reading from an image stored in Win32 simulators native
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* file system.
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* @pre Only available on the Win32 simulator
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*
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* @return TRUE if the IO open function succeeds
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*
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* @param[in] img The image structure
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* @param[in] filename The filename to open
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*
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*/
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bool_t gdispImageSetFileReader(gdispImage *img, const char *filename);
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/* Old definition */
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#define gdispImageSetSimulFileReader(img, fname) gdispImageSetFileReader(img, fname)
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#endif
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/**
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* @brief Open an image ready for drawing
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* @details Determine the image format and get ready to decode the first image frame
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* @return GDISP_IMAGE_ERR_OK (0) on success or an error code.
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*
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* @param[in] img The image structure
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*
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* @pre The io fields should be filled in before calling gdispImageOpen()
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*
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* @note This determines which decoder to use and then initialises all other fields
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* in the gdispImage structure.
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* @note The image background color is set to White.
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* @note There are three types of return - everything OK, partial success and unrecoverable
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* failures. For everything OK it returns GDISP_IMAGE_ERR_OK. A partial success can
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* be distinguished from a unrecoverable failure by testing the GDISP_IMAGE_ERR_UNRECOVERABLE
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* bit in the error code.
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* A partial success return code means an image can still be drawn but perhaps with
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* reduced functionality eg only the first page of a multi-page image.
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* @note @p gdispImageClose() can be called even after a failure to open the image to ensure
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* that the IO close routine gets called.
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*/
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gdispImageError gdispImageOpen(gdispImage *img);
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/**
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* @brief Close an image and release any dynamicly allocated working storage.
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*
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* @param[in] img The image structure
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*
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* @pre gdispImageOpen() must have returned successfully.
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*
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* @note Also calls the IO close function (if it hasn't already been called).
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*/
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void gdispImageClose(gdispImage *img);
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/**
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* @brief Set the background color of the image.
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*
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* @param[in] img The image structure
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* @param[in] bgcolor The background color to use
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*
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* @pre gdispImageOpen() must have returned successfully.
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*
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* @note This color is only used when an image has to restore part of the background before
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* continuing with drawing that includes transparency eg some GIF animations.
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*/
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void gdispImageSetBgColor(gdispImage *img, color_t bgcolor);
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/**
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* @brief Cache the image
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* @details Decodes and caches the current frame into RAM.
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* @return GDISP_IMAGE_ERR_OK (0) on success or an error code.
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*
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* @param[in] img The image structure
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*
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* @pre gdispImageOpen() must have returned successfully.
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*
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* @note This can use a LOT of RAM!
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* @note The decoder may choose to ignore the request for caching. If it does so it will
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* return GDISP_IMAGE_ERR_UNSUPPORTED_OK.
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* @note A fatal error here does not necessarily mean that drawing the image will fail. For
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* example, a GDISP_IMAGE_ERR_NOMEMORY error simply means there isn't enough RAM to
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* cache the image.
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*/
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gdispImageError gdispImageCache(gdispImage *img);
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/**
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* @brief Draw the image
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* @return GDISP_IMAGE_ERR_OK (0) on success or an error code.
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*
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* @param[in] img The image structure
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* @param[in] x,y The screen location to draw the image
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* @param[in] cx,cy The area on the screen to draw
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* @param[in] sx,sy The image position to start drawing at
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*
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* @pre gdispImageOpen() must have returned successfully.
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*
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* @note If sx,sy + cx,cy is outside the image boundaries the area outside the image
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* is simply not drawn.
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* @note If @p gdispImageCache() has been called first for this frame, this routine will draw using a
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* fast blit from the cached frame. If not, it reads the input and decodes it as it
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* is drawing. This may be significantly slower than if the image has been cached (but
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* uses a lot less RAM)
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*/
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gdispImageError gdispImageDraw(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
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/**
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* @brief Prepare for the next frame/page in the image file.
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* @return A time in milliseconds to keep displaying the current frame before trying to draw
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* the next frame. Watch out for the special values TIME_IMMEDIATE and TIME_INFINITE.
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*
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* @param[in] img The image structure
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*
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* @pre gdispImageOpen() must have returned successfully.
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*
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* @note It will return TIME_IMMEDIATE if the first frame/page hasn't been drawn or if the next frame
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* should be drawn immediately.
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* @note It will return TIME_INFINITE if another image frame doesn't exist or an error has occurred.
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* @note Images that support multiple pages (eg TIFF files) will return TIME_IMMEDIATE between pages
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* and then TIME_INFINITE when there are no more pages.
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* @note An image that displays a looped animation will never return TIME_INFINITE unless it
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* gets an error.
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* @note Calling gdispImageDraw() after getting a TIME_INFINITE will go back to drawing the first
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* frame/page.
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*/
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delaytime_t gdispImageNext(gdispImage *img);
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#if GDISP_NEED_IMAGE_NATIVE
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/**
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* @brief The image drawing routines for a NATIVE format image.
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*
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* @note Only use these functions if you absolutely know the format
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* of the image you are decoding. Generally you should use the
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* generic functions and it will auto-detect the format.
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* @note A NATIVE format image is defined as an 8 byte header described below, immediately
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* followed by the bitmap data. The bitmap data is stored in the native format for
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* the display controller. If the pixel format specified in the header does not
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* match the controller native format then the image is rejected.
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* @note The 8 byte header:
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* { 'N', 'I', width.hi, width.lo, height.hi, height.lo, format.hi, format.lo }
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* The format word = GDISP_PIXELFORMAT
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* @{
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*/
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gdispImageError gdispImageOpen_NATIVE(gdispImage *img);
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void gdispImageClose_NATIVE(gdispImage *img);
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gdispImageError gdispImageCache_NATIVE(gdispImage *img);
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gdispImageError gdispImageDraw_NATIVE(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
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delaytime_t gdispImageNext_NATIVE(gdispImage *img);
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/* @} */
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#endif
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#if GDISP_NEED_IMAGE_GIF
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/**
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* @brief The image drawing routines for a GIF image.
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* @note Only use these functions if you absolutely know the format
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* of the image you are decoding. Generally you should use the
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* generic functions and it will auto-detect the format.
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* @{
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*/
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gdispImageError gdispImageOpen_GIF(gdispImage *img);
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void gdispImageClose_GIF(gdispImage *img);
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gdispImageError gdispImageCache_GIF(gdispImage *img);
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gdispImageError gdispImageDraw_GIF(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
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delaytime_t gdispImageNext_GIF(gdispImage *img);
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/* @} */
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#endif
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#if GDISP_NEED_IMAGE_BMP
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/**
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* @brief The image drawing routines for a BMP image.
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* @note Only use these functions if you absolutely know the format
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* of the image you are decoding. Generally you should use the
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* generic functions and it will auto-detect the format.
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* @{
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*/
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gdispImageError gdispImageOpen_BMP(gdispImage *img);
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void gdispImageClose_BMP(gdispImage *img);
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gdispImageError gdispImageCache_BMP(gdispImage *img);
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gdispImageError gdispImageDraw_BMP(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
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delaytime_t gdispImageNext_BMP(gdispImage *img);
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/* @} */
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#endif
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#if GDISP_NEED_IMAGE_JPG
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/**
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* @brief The image drawing routines for a JPG image.
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* @note Only use these functions if you absolutely know the format
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* of the image you are decoding. Generally you should use the
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* generic functions and it will auto-detect the format.
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* @{
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*/
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gdispImageError gdispImageOpen_JPG(gdispImage *img);
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void gdispImageClose_JPG(gdispImage *img);
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gdispImageError gdispImageCache_JPG(gdispImage *img);
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gdispImageError gdispImageDraw_JPG(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
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delaytime_t gdispImageNext_JPG(gdispImage *img);
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/* @} */
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#endif
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#if GDISP_NEED_IMAGE_PNG
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/**
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* @brief The image drawing routines for a PNG image.
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* @note Only use these functions if you absolutely know the format
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* of the image you are decoding. Generally you should use the
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* generic functions and it will auto-detect the format.
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* @{
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*/
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gdispImageError gdispImageOpen_PNG(gdispImage *img);
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void gdispImageClose_PNG(gdispImage *img);
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gdispImageError gdispImageCache_PNG(gdispImage *img);
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gdispImageError gdispImageDraw_PNG(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
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delaytime_t gdispImageNext_PNG(gdispImage *img);
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/* @} */
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* GFX_USE_GDISP && GDISP_NEED_IMAGE */
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#endif /* _GDISP_IMAGE_H */
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/** @} */
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