/src/cairo/subprojects/pixman-0.44.2/pixman/pixman-image.c

Source (jump to first uncovered line)
/*
 * 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 <pixman-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 (flags & FAST_PATH_AFFINE_TRANSFORM)
  {
      /* Suppose the transform is
       *
       *    [ t00, t01, t02 ]
       *    [ t10, t11, t12 ]
       *    [   0,   0,   1 ]
       *
       * and the destination coordinates are (n + 0.5, m + 0.5). Then
       * the transformed x coordinate is:
       *
       *     tx = t00 * (n + 0.5) + t01 * (m + 0.5) + t02
       *        = t00 * n + t01 * m + t02 + (t00 + t01) * 0.5
       *
       * which implies that if t00, t01 and t02 are all integers
       * and (t00 + t01) is odd, then tx will be an integer plus 0.5,
       * which means a BILINEAR filter will reduce to NEAREST. The same
       * applies in the y direction
       */
      pixman_fixed_t (*t)[3] = image->common.transform->matrix;

      if ((pixman_fixed_frac (
         t[0][0] | t[0][1] | t[0][2] |
         t[1][0] | t[1][1] | t[1][2]) == 0)     &&
    (pixman_fixed_to_int (
        (t[0][0] + t[0][1]) & (t[1][0] + t[1][1])) % 2) == 1)
      {
    /* 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,
                                const 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,
                              const 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 void
pixman_image_set_dither (pixman_image_t *image,
       pixman_dither_t dither)
{
    if (image->type == BITS)
    {
  if (image->bits.dither == dither)
      return;

  image->bits.dither = dither;

  image_property_changed (image);
    }
}

PIXMAN_EXPORT void
pixman_image_set_dither_offset (pixman_image_t *image,
        int             offset_x,
        int             offset_y)
{
    if (image->type == BITS)
    {
  if (image->bits.dither_offset_x == offset_x &&
      image->bits.dither_offset_y == offset_y)
  {
      return;
  }

  image->bits.dither_offset_x = offset_x;
  image->bits.dither_offset_y = offset_y;

  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)
    {
  /* Accessors only work for <= 32 bpp. */
  if (PIXMAN_FORMAT_BPP(image->bits.format) > 32)
      return_if_fail (!read_func && !write_func);

  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 = (uint32_t)(*(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;
}

Coverage Report

Created: 2025-07-23 08:13