beta-0.89.2

[luatex.git] / source / libs / pixman / pixman-src / pixman / pixman-image.c

/*
 * Copyright © 2000 SuSE, Inc.
 * Copyright © 2007 Red Hat, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of SuSE not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  SuSE makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "pixman-private.h"

static const pixman_color_t transparent_black = { 0, 0, 0, 0 };

static void
gradient_property_changed (pixman_image_t *image)
{
    gradient_t *gradient = &image->gradient;
    int n = gradient->n_stops;
    pixman_gradient_stop_t *stops = gradient->stops;
    pixman_gradient_stop_t *begin = &(gradient->stops[-1]);
    pixman_gradient_stop_t *end = &(gradient->stops[n]);

    switch (gradient->common.repeat)
    {
    default:
    case PIXMAN_REPEAT_NONE:
        begin->x = INT32_MIN;
        begin->color = transparent_black;
        end->x = INT32_MAX;
        end->color = transparent_black;
        break;

    case PIXMAN_REPEAT_NORMAL:
        begin->x = stops[n - 1].x - pixman_fixed_1;
        begin->color = stops[n - 1].color;
        end->x = stops[0].x + pixman_fixed_1;
        end->color = stops[0].color;
        break;

    case PIXMAN_REPEAT_REFLECT:
        begin->x = - stops[0].x;
        begin->color = stops[0].color;
        end->x = pixman_int_to_fixed (2) - stops[n - 1].x;
        end->color = stops[n - 1].color;
        break;

    case PIXMAN_REPEAT_PAD:
        begin->x = INT32_MIN;
        begin->color = stops[0].color;
        end->x = INT32_MAX;
        end->color = stops[n - 1].color;
        break;
    }
}

pixman_bool_t
_pixman_init_gradient (gradient_t *                  gradient,
                       const pixman_gradient_stop_t *stops,
                       int                           n_stops)
{
    return_val_if_fail (n_stops > 0, FALSE);

    /* We allocate two extra stops, one before the beginning of the stop list,
     * and one after the end. These stops are initialized to whatever color
     * would be used for positions outside the range of the stop list.
     *
     * This saves a bit of computation in the gradient walker.
     *
     * The pointer we store in the gradient_t struct still points to the
     * first user-supplied struct, so when freeing, we will have to
     * subtract one.
     */
    gradient->stops =
        pixman_malloc_ab (n_stops + 2, sizeof (pixman_gradient_stop_t));
    if (!gradient->stops)
        return FALSE;

    gradient->stops += 1;
    memcpy (gradient->stops, stops, n_stops * sizeof (pixman_gradient_stop_t));
    gradient->n_stops = n_stops;

    gradient->common.property_changed = gradient_property_changed;

    return TRUE;
}

void
_pixman_image_init (pixman_image_t *image)
{
    image_common_t *common = &image->common;

    pixman_region32_init (&common->clip_region);

    common->alpha_count = 0;
    common->have_clip_region = FALSE;
    common->clip_sources = FALSE;
    common->transform = NULL;
    common->repeat = PIXMAN_REPEAT_NONE;
    common->filter = PIXMAN_FILTER_NEAREST;
    common->filter_params = NULL;
    common->n_filter_params = 0;
    common->alpha_map = NULL;
    common->component_alpha = FALSE;
    common->ref_count = 1;
    common->property_changed = NULL;
    common->client_clip = FALSE;
    common->destroy_func = NULL;
    common->destroy_data = NULL;
    common->dirty = TRUE;
}

pixman_bool_t
_pixman_image_fini (pixman_image_t *image)
{
    image_common_t *common = (image_common_t *)image;

    common->ref_count--;

    if (common->ref_count == 0)
    {
        if (image->common.destroy_func)
            image->common.destroy_func (image, image->common.destroy_data);

        pixman_region32_fini (&common->clip_region);

        free (common->transform);
        free (common->filter_params);

        if (common->alpha_map)
            pixman_image_unref ((pixman_image_t *)common->alpha_map);

        if (image->type == LINEAR ||
            image->type == RADIAL ||
            image->type == CONICAL)
        {
            if (image->gradient.stops)
            {
                /* See _pixman_init_gradient() for an explanation of the - 1 */
                free (image->gradient.stops - 1);
            }

            /* This will trigger if someone adds a property_changed
             * method to the linear/radial/conical gradient overwriting
             * the general one.
             */
            assert (
                image->common.property_changed == gradient_property_changed);
        }

        if (image->type == BITS && image->bits.free_me)
            free (image->bits.free_me);

        return TRUE;
    }

    return FALSE;
}

pixman_image_t *
_pixman_image_allocate (void)
{
    pixman_image_t *image = malloc (sizeof (pixman_image_t));

    if (image)
        _pixman_image_init (image);

    return image;
}

static void
image_property_changed (pixman_image_t *image)
{
    image->common.dirty = TRUE;
}

/* Ref Counting */
PIXMAN_EXPORT pixman_image_t *
pixman_image_ref (pixman_image_t *image)
{
    image->common.ref_count++;

    return image;
}

/* returns TRUE when the image is freed */
PIXMAN_EXPORT pixman_bool_t
pixman_image_unref (pixman_image_t *image)
{
    if (_pixman_image_fini (image))
    {
        free (image);
        return TRUE;
    }

    return FALSE;
}

PIXMAN_EXPORT void
pixman_image_set_destroy_function (pixman_image_t *            image,
                                   pixman_image_destroy_func_t func,
                                   void *                      data)
{
    image->common.destroy_func = func;
    image->common.destroy_data = data;
}

PIXMAN_EXPORT void *
pixman_image_get_destroy_data (pixman_image_t *image)
{
  return image->common.destroy_data;
}

void
_pixman_image_reset_clip_region (pixman_image_t *image)
{
    image->common.have_clip_region = FALSE;
}

/* Executive Summary: This function is a no-op that only exists
 * for historical reasons.
 *
 * There used to be a bug in the X server where it would rely on
 * out-of-bounds accesses when it was asked to composite with a
 * window as the source. It would create a pixman image pointing
 * to some bogus position in memory, but then set a clip region
 * to the position where the actual bits were.
 *
 * Due to a bug in old versions of pixman, where it would not clip
 * against the image bounds when a clip region was set, this would
 * actually work. So when the pixman bug was fixed, a workaround was
 * added to allow certain out-of-bound accesses. This function disabled
 * those workarounds.
 *
 * Since 0.21.2, pixman doesn't do these workarounds anymore, so now
 * this function is a no-op.
 */
PIXMAN_EXPORT void
pixman_disable_out_of_bounds_workaround (void)
{
}

static void
compute_image_info (pixman_image_t *image)
{
    pixman_format_code_t code;
    uint32_t flags = 0;

    /* Transform */
    if (!image->common.transform)
    {
        flags |= (FAST_PATH_ID_TRANSFORM        |
                  FAST_PATH_X_UNIT_POSITIVE     |
                  FAST_PATH_Y_UNIT_ZERO         |
                  FAST_PATH_AFFINE_TRANSFORM);
    }
    else
    {
        flags |= FAST_PATH_HAS_TRANSFORM;

        if (image->common.transform->matrix[2][0] == 0                  &&
            image->common.transform->matrix[2][1] == 0                  &&
            image->common.transform->matrix[2][2] == pixman_fixed_1)
        {
            flags |= FAST_PATH_AFFINE_TRANSFORM;

            if (image->common.transform->matrix[0][1] == 0 &&
                image->common.transform->matrix[1][0] == 0)
            {
                if (image->common.transform->matrix[0][0] == -pixman_fixed_1 &&
                    image->common.transform->matrix[1][1] == -pixman_fixed_1)
                {
                    flags |= FAST_PATH_ROTATE_180_TRANSFORM;
                }
                flags |= FAST_PATH_SCALE_TRANSFORM;
            }
            else if (image->common.transform->matrix[0][0] == 0 &&
                     image->common.transform->matrix[1][1] == 0)
            {
                pixman_fixed_t m01 = image->common.transform->matrix[0][1];
                pixman_fixed_t m10 = image->common.transform->matrix[1][0];

                if (m01 == -pixman_fixed_1 && m10 == pixman_fixed_1)
                    flags |= FAST_PATH_ROTATE_90_TRANSFORM;
                else if (m01 == pixman_fixed_1 && m10 == -pixman_fixed_1)
                    flags |= FAST_PATH_ROTATE_270_TRANSFORM;
            }
        }

        if (image->common.transform->matrix[0][0] > 0)
            flags |= FAST_PATH_X_UNIT_POSITIVE;

        if (image->common.transform->matrix[1][0] == 0)
            flags |= FAST_PATH_Y_UNIT_ZERO;
    }

    /* Filter */
    switch (image->common.filter)
    {
    case PIXMAN_FILTER_NEAREST:
    case PIXMAN_FILTER_FAST:
        flags |= (FAST_PATH_NEAREST_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
        break;

    case PIXMAN_FILTER_BILINEAR:
    case PIXMAN_FILTER_GOOD:
    case PIXMAN_FILTER_BEST:
        flags |= (FAST_PATH_BILINEAR_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);

        /* Here we have a chance to optimize BILINEAR filter to NEAREST if
         * they are equivalent for the currently used transformation matrix.
         */
        if (flags & FAST_PATH_ID_TRANSFORM)
        {
            flags |= FAST_PATH_NEAREST_FILTER;
        }
        else if (
            /* affine and integer translation components in matrix ... */
            ((flags & FAST_PATH_AFFINE_TRANSFORM) &&
             !pixman_fixed_frac (image->common.transform->matrix[0][2] |
                                 image->common.transform->matrix[1][2])) &&
            (
                /* ... combined with a simple rotation */
                (flags & (FAST_PATH_ROTATE_90_TRANSFORM |
                          FAST_PATH_ROTATE_180_TRANSFORM |
                          FAST_PATH_ROTATE_270_TRANSFORM)) ||
                /* ... or combined with a simple non-rotated translation */
                (image->common.transform->matrix[0][0] == pixman_fixed_1 &&
                 image->common.transform->matrix[1][1] == pixman_fixed_1 &&
                 image->common.transform->matrix[0][1] == 0 &&
                 image->common.transform->matrix[1][0] == 0)
                )
            )
        {
            /* FIXME: there are some affine-test failures, showing that
             * handling of BILINEAR and NEAREST filter is not quite
             * equivalent when getting close to 32K for the translation
             * components of the matrix. That's likely some bug, but for
             * now just skip BILINEAR->NEAREST optimization in this case.
             */
            pixman_fixed_t magic_limit = pixman_int_to_fixed (30000);
            if (image->common.transform->matrix[0][2] <= magic_limit  &&
                image->common.transform->matrix[1][2] <= magic_limit  &&
                image->common.transform->matrix[0][2] >= -magic_limit &&
                image->common.transform->matrix[1][2] >= -magic_limit)
            {
                flags |= FAST_PATH_NEAREST_FILTER;
            }
        }
        break;

    case PIXMAN_FILTER_CONVOLUTION:
        break;

    case PIXMAN_FILTER_SEPARABLE_CONVOLUTION:
        flags |= FAST_PATH_SEPARABLE_CONVOLUTION_FILTER;
        break;

    default:
        flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
        break;
    }

    /* Repeat mode */
    switch (image->common.repeat)
    {
    case PIXMAN_REPEAT_NONE:
        flags |=
            FAST_PATH_NO_REFLECT_REPEAT         |
            FAST_PATH_NO_PAD_REPEAT             |
            FAST_PATH_NO_NORMAL_REPEAT;
        break;

    case PIXMAN_REPEAT_REFLECT:
        flags |=
            FAST_PATH_NO_PAD_REPEAT             |
            FAST_PATH_NO_NONE_REPEAT            |
            FAST_PATH_NO_NORMAL_REPEAT;
        break;

    case PIXMAN_REPEAT_PAD:
        flags |=
            FAST_PATH_NO_REFLECT_REPEAT         |
            FAST_PATH_NO_NONE_REPEAT            |
            FAST_PATH_NO_NORMAL_REPEAT;
        break;

    default:
        flags |=
            FAST_PATH_NO_REFLECT_REPEAT         |
            FAST_PATH_NO_PAD_REPEAT             |
            FAST_PATH_NO_NONE_REPEAT;
        break;
    }

    /* Component alpha */
    if (image->common.component_alpha)
        flags |= FAST_PATH_COMPONENT_ALPHA;
    else
        flags |= FAST_PATH_UNIFIED_ALPHA;

    flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NARROW_FORMAT);

    /* Type specific checks */
    switch (image->type)
    {
    case SOLID:
        code = PIXMAN_solid;

        if (image->solid.color.alpha == 0xffff)
            flags |= FAST_PATH_IS_OPAQUE;
        break;

    case BITS:
        if (image->bits.width == 1      &&
            image->bits.height == 1     &&
            image->common.repeat != PIXMAN_REPEAT_NONE)
        {
            code = PIXMAN_solid;
        }
        else
        {
            code = image->bits.format;
            flags |= FAST_PATH_BITS_IMAGE;
        }

        if (!PIXMAN_FORMAT_A (image->bits.format)                               &&
            PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_GRAY         &&
            PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_COLOR)
        {
            flags |= FAST_PATH_SAMPLES_OPAQUE;

            if (image->common.repeat != PIXMAN_REPEAT_NONE)
                flags |= FAST_PATH_IS_OPAQUE;
        }

        if (image->bits.read_func || image->bits.write_func)
            flags &= ~FAST_PATH_NO_ACCESSORS;

        if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
            flags &= ~FAST_PATH_NARROW_FORMAT;
        break;

    case RADIAL:
        code = PIXMAN_unknown;

        /*
         * As explained in pixman-radial-gradient.c, every point of
         * the plane has a valid associated radius (and thus will be
         * colored) if and only if a is negative (i.e. one of the two
         * circles contains the other one).
         */

        if (image->radial.a >= 0)
            break;

        /* Fall through */

    case CONICAL:
    case LINEAR:
        code = PIXMAN_unknown;

        if (image->common.repeat != PIXMAN_REPEAT_NONE)
        {
            int i;

            flags |= FAST_PATH_IS_OPAQUE;
            for (i = 0; i < image->gradient.n_stops; ++i)
            {
                if (image->gradient.stops[i].color.alpha != 0xffff)
                {
                    flags &= ~FAST_PATH_IS_OPAQUE;
                    break;
                }
            }
        }
        break;

    default:
        code = PIXMAN_unknown;
        break;
    }

    /* Alpha maps are only supported for BITS images, so it's always
     * safe to ignore their presense for non-BITS images
     */
    if (!image->common.alpha_map || image->type != BITS)
    {
        flags |= FAST_PATH_NO_ALPHA_MAP;
    }
    else
    {
        if (PIXMAN_FORMAT_IS_WIDE (image->common.alpha_map->format))
            flags &= ~FAST_PATH_NARROW_FORMAT;
    }

    /* Both alpha maps and convolution filters can introduce
     * non-opaqueness in otherwise opaque images. Also
     * an image with component alpha turned on is only opaque
     * if all channels are opaque, so we simply turn it off
     * unconditionally for those images.
     */
    if (image->common.alpha_map                                         ||
        image->common.filter == PIXMAN_FILTER_CONVOLUTION               ||
        image->common.filter == PIXMAN_FILTER_SEPARABLE_CONVOLUTION     ||
        image->common.component_alpha)
    {
        flags &= ~(FAST_PATH_IS_OPAQUE | FAST_PATH_SAMPLES_OPAQUE);
    }

    image->common.flags = flags;
    image->common.extended_format_code = code;
}

void
_pixman_image_validate (pixman_image_t *image)
{
    if (image->common.dirty)
    {
        compute_image_info (image);

        /* It is important that property_changed is
         * called *after* compute_image_info() because
         * property_changed() can make use of the flags
         * to set up accessors etc.
         */
        if (image->common.property_changed)
            image->common.property_changed (image);

        image->common.dirty = FALSE;
    }

    if (image->common.alpha_map)
        _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
}

PIXMAN_EXPORT pixman_bool_t
pixman_image_set_clip_region32 (pixman_image_t *   image,
                                pixman_region32_t *region)
{
    image_common_t *common = (image_common_t *)image;
    pixman_bool_t result;

    if (region)
    {
        if ((result = pixman_region32_copy (&common->clip_region, region)))
            image->common.have_clip_region = TRUE;
    }
    else
    {
        _pixman_image_reset_clip_region (image);

        result = TRUE;
    }

    image_property_changed (image);

    return result;
}

PIXMAN_EXPORT pixman_bool_t
pixman_image_set_clip_region (pixman_image_t *   image,
                              pixman_region16_t *region)
{
    image_common_t *common = (image_common_t *)image;
    pixman_bool_t result;

    if (region)
    {
        if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
            image->common.have_clip_region = TRUE;
    }
    else
    {
        _pixman_image_reset_clip_region (image);

        result = TRUE;
    }

    image_property_changed (image);

    return result;
}

PIXMAN_EXPORT void
pixman_image_set_has_client_clip (pixman_image_t *image,
                                  pixman_bool_t   client_clip)
{
    image->common.client_clip = client_clip;
}

PIXMAN_EXPORT pixman_bool_t
pixman_image_set_transform (pixman_image_t *          image,
                            const pixman_transform_t *transform)
{
    static const pixman_transform_t id =
    {
        { { pixman_fixed_1, 0, 0 },
          { 0, pixman_fixed_1, 0 },
          { 0, 0, pixman_fixed_1 } }
    };

    image_common_t *common = (image_common_t *)image;
    pixman_bool_t result;

    if (common->transform == transform)
        return TRUE;

    if (!transform || memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
    {
        free (common->transform);
        common->transform = NULL;
        result = TRUE;

        goto out;
    }

    if (common->transform &&
        memcmp (common->transform, transform, sizeof (pixman_transform_t)) == 0)
    {
        return TRUE;
    }

    if (common->transform == NULL)
        common->transform = malloc (sizeof (pixman_transform_t));

    if (common->transform == NULL)
    {
        result = FALSE;

        goto out;
    }

    memcpy (common->transform, transform, sizeof(pixman_transform_t));

    result = TRUE;

out:
    image_property_changed (image);

    return result;
}

PIXMAN_EXPORT void
pixman_image_set_repeat (pixman_image_t *image,
                         pixman_repeat_t repeat)
{
    if (image->common.repeat == repeat)
        return;

    image->common.repeat = repeat;

    image_property_changed (image);
}

PIXMAN_EXPORT pixman_bool_t
pixman_image_set_filter (pixman_image_t *      image,
                         pixman_filter_t       filter,
                         const pixman_fixed_t *params,
                         int                   n_params)
{
    image_common_t *common = (image_common_t *)image;
    pixman_fixed_t *new_params;

    if (params == common->filter_params && filter == common->filter)
        return TRUE;

    if (filter == PIXMAN_FILTER_SEPARABLE_CONVOLUTION)
    {
        int width = pixman_fixed_to_int (params[0]);
        int height = pixman_fixed_to_int (params[1]);
        int x_phase_bits = pixman_fixed_to_int (params[2]);
        int y_phase_bits = pixman_fixed_to_int (params[3]);
        int n_x_phases = (1 << x_phase_bits);
        int n_y_phases = (1 << y_phase_bits);

        return_val_if_fail (
            n_params == 4 + n_x_phases * width + n_y_phases * height, FALSE);
    }
    
    new_params = NULL;
    if (params)
    {
        new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
        if (!new_params)
            return FALSE;

        memcpy (new_params,
                params, n_params * sizeof (pixman_fixed_t));
    }

    common->filter = filter;

    if (common->filter_params)
        free (common->filter_params);

    common->filter_params = new_params;
    common->n_filter_params = n_params;

    image_property_changed (image);
    return TRUE;
}

PIXMAN_EXPORT void
pixman_image_set_source_clipping (pixman_image_t *image,
                                  pixman_bool_t   clip_sources)
{
    if (image->common.clip_sources == clip_sources)
        return;

    image->common.clip_sources = clip_sources;

    image_property_changed (image);
}

/* Unlike all the other property setters, this function does not
 * copy the content of indexed. Doing this copying is simply
 * way, way too expensive.
 */
PIXMAN_EXPORT void
pixman_image_set_indexed (pixman_image_t *        image,
                          const pixman_indexed_t *indexed)
{
    bits_image_t *bits = (bits_image_t *)image;

    if (bits->indexed == indexed)
        return;

    bits->indexed = indexed;

    image_property_changed (image);
}

PIXMAN_EXPORT void
pixman_image_set_alpha_map (pixman_image_t *image,
                            pixman_image_t *alpha_map,
                            int16_t         x,
                            int16_t         y)
{
    image_common_t *common = (image_common_t *)image;

    return_if_fail (!alpha_map || alpha_map->type == BITS);

    if (alpha_map && common->alpha_count > 0)
    {
        /* If this image is being used as an alpha map itself,
         * then you can't give it an alpha map of its own.
         */
        return;
    }

    if (alpha_map && alpha_map->common.alpha_map)
    {
        /* If the image has an alpha map of its own,
         * then it can't be used as an alpha map itself
         */
        return;
    }

    if (common->alpha_map != (bits_image_t *)alpha_map)
    {
        if (common->alpha_map)
        {
            common->alpha_map->common.alpha_count--;

            pixman_image_unref ((pixman_image_t *)common->alpha_map);
        }

        if (alpha_map)
        {
            common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);

            common->alpha_map->common.alpha_count++;
        }
        else
        {
            common->alpha_map = NULL;
        }
    }

    common->alpha_origin_x = x;
    common->alpha_origin_y = y;

    image_property_changed (image);
}

PIXMAN_EXPORT void
pixman_image_set_component_alpha   (pixman_image_t *image,
                                    pixman_bool_t   component_alpha)
{
    if (image->common.component_alpha == component_alpha)
        return;

    image->common.component_alpha = component_alpha;

    image_property_changed (image);
}

PIXMAN_EXPORT pixman_bool_t
pixman_image_get_component_alpha   (pixman_image_t       *image)
{
    return image->common.component_alpha;
}

PIXMAN_EXPORT void
pixman_image_set_accessors (pixman_image_t *           image,
                            pixman_read_memory_func_t  read_func,
                            pixman_write_memory_func_t write_func)
{
    return_if_fail (image != NULL);

    if (image->type == BITS)
    {
        image->bits.read_func = read_func;
        image->bits.write_func = write_func;

        image_property_changed (image);
    }
}

PIXMAN_EXPORT uint32_t *
pixman_image_get_data (pixman_image_t *image)
{
    if (image->type == BITS)
        return image->bits.bits;

    return NULL;
}

PIXMAN_EXPORT int
pixman_image_get_width (pixman_image_t *image)
{
    if (image->type == BITS)
        return image->bits.width;

    return 0;
}

PIXMAN_EXPORT int
pixman_image_get_height (pixman_image_t *image)
{
    if (image->type == BITS)
        return image->bits.height;

    return 0;
}

PIXMAN_EXPORT int
pixman_image_get_stride (pixman_image_t *image)
{
    if (image->type == BITS)
        return image->bits.rowstride * (int) sizeof (uint32_t);

    return 0;
}

PIXMAN_EXPORT int
pixman_image_get_depth (pixman_image_t *image)
{
    if (image->type == BITS)
        return PIXMAN_FORMAT_DEPTH (image->bits.format);

    return 0;
}

PIXMAN_EXPORT pixman_format_code_t
pixman_image_get_format (pixman_image_t *image)
{
    if (image->type == BITS)
        return image->bits.format;

    return PIXMAN_null;
}

uint32_t
_pixman_image_get_solid (pixman_implementation_t *imp,
                         pixman_image_t *         image,
                         pixman_format_code_t     format)
{
    uint32_t result;

    if (image->type == SOLID)
    {
        result = image->solid.color_32;
    }
    else if (image->type == BITS)
    {
        if (image->bits.format == PIXMAN_a8r8g8b8)
            result = image->bits.bits[0];
        else if (image->bits.format == PIXMAN_x8r8g8b8)
            result = image->bits.bits[0] | 0xff000000;
        else if (image->bits.format == PIXMAN_a8)
            result = (*(uint8_t *)image->bits.bits) << 24;
        else
            goto otherwise;
    }
    else
    {
        pixman_iter_t iter;

    otherwise:
        _pixman_implementation_iter_init (
            imp, &iter, image, 0, 0, 1, 1,
            (uint8_t *)&result,
            ITER_NARROW | ITER_SRC, image->common.flags);
        
        result = *iter.get_scanline (&iter, NULL);

        if (iter.fini)
            iter.fini (&iter);
    }

    /* If necessary, convert RGB <--> BGR. */
    if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB
        && PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB_SRGB)
    {
        result = (((result & 0xff000000) >>  0) |
                  ((result & 0x00ff0000) >> 16) |
                  ((result & 0x0000ff00) >>  0) |
                  ((result & 0x000000ff) << 16));
    }

    return result;
}