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annotate include/mb_img_ldr.h @ 618:35a67a837a53 openvg

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Use reference count to trace life of _ge_openvg_img_t objects
author Thinker K.F. Li <thinker@branda.to>
date Thu, 08 Jul 2010 13:51:47 +0800
parents 43900cae1d49
children 586e50f82c1f
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50d253d0fcba Simple image loader and image shape.
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1 #ifndef __MB_IMG_LDR_H_
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2 #define __MB_IMG_LDR_H_
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3
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4 typedef struct _mb_img_data mb_img_data_t;
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5 typedef struct _mb_img_ldr mb_img_ldr_t;
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6
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7 typedef enum _mb_img_fmt {
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8 MB_IFMT_DUMMY,
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9 MB_IFMT_ARGB32,
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10 MB_IFMT_RGB24,
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11 MB_IFMT_A8,
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12 MB_IFMT_A1,
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13 MB_IFMT_RGB16_565
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14 } mb_img_fmt_t;
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16 /*! \brief Encapsulate image.
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17 *
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18 * The format and content of an image is encapsulated by imag_data_t.
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19 * We hope someday, we can create an abstract backend layer that
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20 * can deal with image data.
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21 */
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22 struct _mb_img_data {
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23 /*! \brief Content of the image. */
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24 void *content;
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25 int w, h;
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26 int stride; /*!< \brief Number of bytes a row */
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27 mb_img_fmt_t fmt;
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28 /*! \brief Release the image that was loaded by the loader. */
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29 void (*free)(mb_img_data_t *img);
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30 };
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31 #define MB_IMG_DATA_FREE(img) (img)->free(img)
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33 /*! \brief Image loader.
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34 *
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35 * An image loader take a ID and find out the corresponding
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36 * image from filesystem or somewhere. Image ID is a hierachical
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37 * structured path. It is relative to the root of image database.
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38 * Users of a loader do not need to know where the database is.
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39 * The location can be configured when a loader been instantiated.
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40 * But, it is invisible when loading images by an image loader.
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41 */
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42 struct _mb_img_ldr {
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43 /*! \brief Load a image with specified ID. */
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44 mb_img_data_t *(*load)(mb_img_ldr_t *ldr, const char *img_id);
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45 /*! \brief Free the loader. */
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46 void (*free)(mb_img_ldr_t *ldr);
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47 };
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48 #define MB_IMG_LDR_FREE(ldr) (ldr)->free(ldr)
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49 #define MB_IMG_LDR_LOAD(ldr, img_id) (ldr)->load(ldr, img_id)
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50
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51 /*! \brief Create a simple image loader.
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52 *
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53 * \param img_repository is a repository where images are loaded from.
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54 * \return NULL for error.
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55 */
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56 extern mb_img_ldr_t *simple_mb_img_ldr_new(const char *img_repository);
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57
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58 #endif /* __MB_IMG_LDR_H_ */