source: mainline/uspace/lib/ui/src/image.c@ 63b35c7

/*
 * Copyright (c) 2020 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libui
 * @{
 */
/**
 * @file Image
 */

#include <errno.h>
#include <gfx/bitmap.h>
#include <gfx/context.h>
#include <gfx/text.h>
#include <stdlib.h>
#include <str.h>
#include <ui/control.h>
#include <ui/paint.h>
#include <ui/image.h>
#include "../private/image.h"
#include "../private/resource.h"
#include "../private/ui.h"

static void ui_image_ctl_destroy(void *);
static errno_t ui_image_ctl_paint(void *);
static ui_evclaim_t ui_image_ctl_pos_event(void *, pos_event_t *);

/** Image control ops */
ui_control_ops_t ui_image_ops = {
        .destroy = ui_image_ctl_destroy,
        .paint = ui_image_ctl_paint,
        .pos_event = ui_image_ctl_pos_event
};

/** Create new image.
 *
 * @param resource UI resource
 * @param bitmap Bitmap
 * @param brect Bitmap rectangle
 * @param rimage Place to store pointer to new image
 * @return EOK on success, ENOMEM if out of memory
 */
errno_t ui_image_create(ui_resource_t *resource, gfx_bitmap_t *bitmap,
    gfx_rect_t *brect, ui_image_t **rimage)
{
        ui_image_t *image;
        errno_t rc;

        image = calloc(1, sizeof(ui_image_t));
        if (image == NULL)
                return ENOMEM;

        rc = ui_control_new(&ui_image_ops, (void *) image, &image->control);
        if (rc != EOK) {
                free(image);
                return rc;
        }

        image->bitmap = bitmap;
        image->brect = *brect;
        image->res = resource;
        *rimage = image;
        return EOK;
}

/** Destroy image.
 *
 * @param image Image or @c NULL
 */
void ui_image_destroy(ui_image_t *image)
{
        if (image == NULL)
                return;

        ui_control_delete(image->control);
        if (image->bitmap != NULL)
                gfx_bitmap_destroy(image->bitmap);
        free(image);
}

/** Get base control from image.
 *
 * @param image Image
 * @return Control
 */
ui_control_t *ui_image_ctl(ui_image_t *image)
{
        return image->control;
}

/** Set image rectangle.
 *
 * @param image Image
 * @param rect New image rectangle
 */
void ui_image_set_rect(ui_image_t *image, gfx_rect_t *rect)
{
        image->rect = *rect;
}

/** Paint image.
 *
 * @param image Image
 * @return EOK on success or an error code
 */
errno_t ui_image_paint(ui_image_t *image)
{
        gfx_rect_t srect;
        gfx_coord2_t offs;

        if (image->bitmap == NULL)
                return EOK;

        /*
         * UI image position does not depend on bitmap rectangle p0, so
         * we need to subtract it.
         */
        offs.x = image->rect.p0.x - image->brect.p0.x;
        offs.y = image->rect.p0.y - image->brect.p0.y;

        /*
         * Transalte image rectangle back to bitmap coordinate space.
         * Thus the bitmap will be clipped to the image rectangle.
         */
        gfx_rect_rtranslate(&offs, &image->rect, &srect);
        return gfx_bitmap_render(image->bitmap, &srect, &offs);
}

/** Change image bitmap.
 *
 * Note that the caller must have saved the pointer to the previous bitmap
 * in the image, because this causes it to be unlinked from the image and
 * not destroyed (the ownership is transferred back to the caller).
 *
 * @param image Image
 * @param bitmap New bitmap (ownership transferred to image) or @c NULL
 * @param brect New bitmap rectangle
 */
void ui_image_set_bmp(ui_image_t *image, gfx_bitmap_t *bitmap,
    gfx_rect_t *brect)
{
        image->bitmap = bitmap;
        image->brect = *brect;
}

/** Destroy image control.
 *
 * @param arg Argument (ui_image_t *)
 */
void ui_image_ctl_destroy(void *arg)
{
        ui_image_t *image = (ui_image_t *) arg;

        ui_image_destroy(image);
}

/** Paint image control.
 *
 * @param arg Argument (ui_image_t *)
 * @return EOK on success or an error code
 */
errno_t ui_image_ctl_paint(void *arg)
{
        ui_image_t *image = (ui_image_t *) arg;

        return ui_image_paint(image);
}

/** Handle image control position event.
 *
 * @param arg Argument (ui_image_t *)
 * @param pos_event Position event
 * @return @c ui_claimed iff the event is claimed
 */
ui_evclaim_t ui_image_ctl_pos_event(void *arg, pos_event_t *event)
{
        ui_image_t *image = (ui_image_t *) arg;

        (void) image;
        return ui_unclaimed;
}

/** @}
 */