rt-thread/components/gui/src/image.c

/*
 * File      : image.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2009-10-16     Bernard      first version
 * 2012-01-24     onelife      add TJpgDec (Tiny JPEG Decompressor) support
 * 2012-08-29     amsl         add Image zoom interface.
 */
#include <rtthread.h>
#include <rtgui/image.h>

#include <rtgui/image_hdc.h>
#include <rtgui/rtgui_system.h>

#include <string.h>
#ifdef _WIN32
#define strncasecmp  strnicmp
#endif

#ifdef RTGUI_IMAGE_XPM
#include <rtgui/image_xpm.h>
#endif

#ifdef RTGUI_IMAGE_BMP
#include <rtgui/image_bmp.h>
#endif
#if (defined(RTGUI_IMAGE_JPEG) || defined(RTGUI_IMAGE_TJPGD))
#include <rtgui/image_jpeg.h>
#endif
#if defined(RTGUI_IMAGE_PNG) || defined(RTGUI_IMAGE_LODEPNG)
#include <rtgui/image_png.h>
#endif

static rtgui_list_t _rtgui_system_image_list = {RT_NULL};

/* initialize rtgui image system */
void rtgui_system_image_init(void)
{
    /* always support HDC image */
    rtgui_image_hdc_init();

#ifdef RTGUI_IMAGE_XPM
    rtgui_image_xpm_init();
#endif

#ifdef RTGUI_IMAGE_BMP
    rtgui_image_bmp_init();
#endif

#if (defined(RTGUI_IMAGE_JPEG) || defined(RTGUI_IMAGE_TJPGD))
    rtgui_image_jpeg_init();
#endif

#if defined(RTGUI_IMAGE_PNG) || defined(RTGUI_IMAGE_LODEPNG)
    rtgui_image_png_init();
#endif
}

static struct rtgui_image_engine *rtgui_image_get_engine(const char *type)
{
    struct rtgui_list_node *node;
    struct rtgui_image_engine *engine;

    rtgui_list_foreach(node, &_rtgui_system_image_list)
    {
        engine = rtgui_list_entry(node, struct rtgui_image_engine, list);

        if (strncasecmp(engine->name, type, strlen(engine->name)) == 0)
            return engine;
    }

    return RT_NULL;
}

#if defined(RTGUI_USING_DFS_FILERW)
struct rtgui_image_engine *rtgui_image_get_engine_by_filename(const char *fn)
{
    struct rtgui_list_node *node;
    struct rtgui_image_engine *engine;
    const char *ext;

    ext = fn + rt_strlen(fn);
    while (ext != fn)
    {
        if (*ext == '.')
        {
            ext ++;
            break;
        }
        ext --;
    }
    if (ext == fn) return RT_NULL; /* no ext */

    rtgui_list_foreach(node, &_rtgui_system_image_list)
    {
        engine = rtgui_list_entry(node, struct rtgui_image_engine, list);
        if (strncasecmp(engine->name, ext, strlen(engine->name)) == 0)
            return engine;
    }

    return RT_NULL;
}
RTM_EXPORT(rtgui_image_get_engine_by_filename);

struct rtgui_image *rtgui_image_create_from_file(const char *type, const char *filename, rt_bool_t load)
{
    struct rtgui_filerw *filerw;
    struct rtgui_image_engine *engine;
    struct rtgui_image *image = RT_NULL;

    /* create filerw context */
    filerw = rtgui_filerw_create_file(filename, "rb");
    if (filerw == RT_NULL) return RT_NULL;

    /* get image engine */
    engine = rtgui_image_get_engine(type);
    if (engine == RT_NULL)
    {
        /* close filerw context */
        rtgui_filerw_close(filerw);
        return RT_NULL;
    }

    if (engine->image_check(filerw) == RT_TRUE)
    {
        image = (struct rtgui_image *) rtgui_malloc(sizeof(struct rtgui_image));
        if (image == RT_NULL)
        {
            /* close filerw context */
            rtgui_filerw_close(filerw);
            return RT_NULL;
        }

        image->palette = RT_NULL;
        if (engine->image_load(image, filerw, load) != RT_TRUE)
        {
            /* close filerw context */
            rtgui_filerw_close(filerw);
            return RT_NULL;
        }

        /* set image engine */
        image->engine = engine;
    }
    else
    {
        rtgui_filerw_close(filerw);
    }

    return image;
}
RTM_EXPORT(rtgui_image_create_from_file);

struct rtgui_image *rtgui_image_create(const char *filename, rt_bool_t load)
{
    struct rtgui_filerw *filerw;
    struct rtgui_image_engine *engine;
    struct rtgui_image *image = RT_NULL;

    /* create filerw context */
    filerw = rtgui_filerw_create_file(filename, "rb");
    if (filerw == RT_NULL) 
    {
        rt_kprintf("create filerw failed!\n");
        return RT_NULL;
    }

    /* get image engine */
    engine = rtgui_image_get_engine_by_filename(filename);
    if (engine == RT_NULL)
    {
        rt_kprintf("no engine for file: %s\n", filename);
        /* close filerw context */
        rtgui_filerw_close(filerw);
        return RT_NULL;
    }

    if (engine->image_check(filerw) == RT_TRUE)
    {
        image = (struct rtgui_image *) rtgui_malloc(sizeof(struct rtgui_image));
        if (image == RT_NULL)
        {
            rt_kprintf("out of memory\n");
            /* close filerw context */
            rtgui_filerw_close(filerw);
            return RT_NULL;
        }

        image->palette = RT_NULL;
        if (engine->image_load(image, filerw, load) != RT_TRUE)
        {
            rt_kprintf("load image:%s failed!\n", filename);
            /* close filerw context */
            rtgui_filerw_close(filerw);
            return RT_NULL;
        }

        /* set image engine */
        image->engine = engine;
    }
    else
    {
        rt_kprintf("image:%s check failed!\n", filename);
        rtgui_filerw_close(filerw);
    }

    return image;
}
RTM_EXPORT(rtgui_image_create);
#endif

struct rtgui_image *rtgui_image_create_from_mem(const char *type, const rt_uint8_t *data, rt_size_t length, rt_bool_t load)
{
    struct rtgui_filerw *filerw;
    struct rtgui_image_engine *engine;
    struct rtgui_image *image = RT_NULL;

    /* create filerw context */
    filerw = rtgui_filerw_create_mem(data, length);
    if (filerw == RT_NULL) return RT_NULL;

    /* get image engine */
    engine = rtgui_image_get_engine(type);
    if (engine == RT_NULL)
    {
        /* close filerw context */
        rtgui_filerw_close(filerw);
        return RT_NULL;
    }

    if (engine->image_check(filerw) == RT_TRUE)
    {
        image = (struct rtgui_image *) rtgui_malloc(sizeof(struct rtgui_image));
        if (image == RT_NULL)
        {
            /* close filerw context */
            rtgui_filerw_close(filerw);
            return RT_NULL;
        }

        image->palette = RT_NULL;
        if (engine->image_load(image, filerw, load) != RT_TRUE)
        {
            /* close filerw context */
            rtgui_filerw_close(filerw);
            return RT_NULL;
        }

        /* set image engine */
        image->engine = engine;
    }
    else
    {
        rtgui_filerw_close(filerw);
    }

    return image;
}
RTM_EXPORT(rtgui_image_create_from_mem);

void rtgui_image_destroy(struct rtgui_image *image)
{
    RT_ASSERT(image != RT_NULL);

    image->engine->image_unload(image);
    if (image->palette != RT_NULL)
        rtgui_free(image->palette);
    rtgui_free(image);
}
RTM_EXPORT(rtgui_image_destroy);

/* register an image engine */
void rtgui_image_register_engine(struct rtgui_image_engine *engine)
{
    RT_ASSERT(engine != RT_NULL);

    rtgui_list_append(&_rtgui_system_image_list, &(engine->list));
}
RTM_EXPORT(rtgui_image_register_engine);

void rtgui_image_blit(struct rtgui_image *image, struct rtgui_dc *dc, struct rtgui_rect *rect)
{
	struct rtgui_rect r;
    RT_ASSERT(dc    != RT_NULL);

    if (rtgui_dc_get_visible(dc) != RT_TRUE) return;

    rtgui_dc_get_rect(dc, &r);

	/* use rect of DC */
	if (rect == RT_NULL)
	{
		rect = &r;
	}
    else
    {
        /* Don't modify x1, y1, they are handled in engine->image_blit. */
        if (rect->x1 > r.x2)
            return;
        if (rect->y1 > r.y2)
            return;

        if (rect->x2 > r.x2)
            rect->x2 = r.x2;
        if (rect->y2 > r.y2)
            rect->y2 = r.y2;
    }

    if (image != RT_NULL && image->engine != RT_NULL)
    {
        /* use image engine to blit */
        image->engine->image_blit(image, dc, rect);
    }
}
RTM_EXPORT(rtgui_image_blit);

struct rtgui_image_palette *rtgui_image_palette_create(rt_uint32_t ncolors)
{
    struct rtgui_image_palette *palette = RT_NULL;

    if (ncolors > 0)
    {
        palette = (struct rtgui_image_palette *) rtgui_malloc(sizeof(struct rtgui_image_palette) +
                  sizeof(rtgui_color_t) * ncolors);
        if (palette != RT_NULL) palette->colors = (rtgui_color_t *)(palette + 1);
    }

    return palette;
}
RTM_EXPORT(rtgui_image_palette_create);

void rtgui_image_get_rect(struct rtgui_image *image, struct rtgui_rect *rect)
{
    RT_ASSERT(image != RT_NULL);
    RT_ASSERT(rect  != RT_NULL);

    rect->x1 = 0;
    rect->y1 = 0;
    rect->x2 = image->w;
    rect->y2 = image->h;
}
RTM_EXPORT(rtgui_image_get_rect);