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annotate include/mb_img_ldr.h @ 1034:e9a134d75c99 refine_backend_if

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To make backend compatible with C++
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 23 Nov 2010 00:29:55 +0800
parents 586e50f82c1f
children
rev   line source
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586e50f82c1f Unify coding style tag for emacs and vim.
Shih-Yuan Lee (FourDollars) <fourdollars@gmail.com>
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 #ifndef __MB_IMG_LDR_H_
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4 #define __MB_IMG_LDR_H_
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5
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6 typedef struct _mb_img_data mb_img_data_t;
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7 typedef struct _mb_img_ldr mb_img_ldr_t;
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8
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9 typedef enum _mb_img_fmt {
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10 MB_IFMT_DUMMY,
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11 MB_IFMT_ARGB32,
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12 MB_IFMT_RGB24,
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13 MB_IFMT_A8,
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14 MB_IFMT_A1,
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15 MB_IFMT_RGB16_565
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16 } mb_img_fmt_t;
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17
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18 /*! \brief Encapsulate image.
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19 *
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20 * The format and content of an image is encapsulated by imag_data_t.
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21 * We hope someday, we can create an abstract backend layer that
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22 * can deal with image data.
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23 */
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24 struct _mb_img_data {
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25 /*! \brief Content of the image. */
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26 void *content;
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27 int w, h;
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28 int stride; /*!< \brief Number of bytes a row */
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29 mb_img_fmt_t fmt;
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30 /*! \brief Release the image that was loaded by the loader. */
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31 void (*free)(mb_img_data_t *img);
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32 };
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33 #define MB_IMG_DATA_FREE(img) (img)->free(img)
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34
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35 /*! \brief Image loader.
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36 *
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37 * An image loader take a ID and find out the corresponding
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38 * image from filesystem or somewhere. Image ID is a hierachical
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39 * structured path. It is relative to the root of image database.
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40 * Users of a loader do not need to know where the database is.
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41 * The location can be configured when a loader been instantiated.
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42 * But, it is invisible when loading images by an image loader.
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43 */
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44 struct _mb_img_ldr {
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45 /*! \brief Load a image with specified ID. */
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46 mb_img_data_t *(*load)(mb_img_ldr_t *ldr, const char *img_id);
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47 /*! \brief Free the loader. */
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48 void (*free)(mb_img_ldr_t *ldr);
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49 };
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50 #define MB_IMG_LDR_FREE(ldr) (ldr)->free(ldr)
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51 #define MB_IMG_LDR_LOAD(ldr, img_id) (ldr)->load(ldr, img_id)
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52
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53 /*! \brief Create a simple image loader.
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54 *
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55 * \param img_repository is a repository where images are loaded from.
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56 * \return NULL for error.
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57 */
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58 extern mb_img_ldr_t *simple_mb_img_ldr_new(const char *img_repository);
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59
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60 #endif /* __MB_IMG_LDR_H_ */