* `GdkPixbuf`, or a Cairo surface, or other pixel data.
*
* The ownership of the pixel data is transferred to the `GdkTexture`
- * instance; you can only make a copy of it, via [method@Gdk.Texture.download]
- * or [method@Gdk.Texture.download_float].
+ * instance; you can only make a copy of it, via [method@Gdk.Texture.download].
*
* `GdkTexture` is an immutable object: That means you cannot change
* anything about it other than increasing the reference count via
stride);
}
-/**
- * gdk_texture_download_float:
- * @texture: a `GdkTexture`
- * @data: (array): pointer to enough memory to be filled with the
- * downloaded data of @texture
- * @stride: rowstride in elements, will usually be equal to
- * gdk_texture_get_width() * 4
- *
- * Downloads the @texture into local memory in a high dynamic range format.
- *
- * This may be an expensive operation, as the actual texture data
- * may reside on a GPU or on a remote display server and because the data
- * may need to be upsampled if it was not already available in this
- * format.
- *
- * You may want to use [method@Gdk.Texture.download] instead if you don't
- * need high dynamic range support.
- *
- * The data format of the downloaded data is equivalent to
- * GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED, so every downloaded
- * pixel requires 16 bytes of memory.
- *
- * Note that the caller is responsible to provide sufficiently
- * aligned memory to access the resulting data directly as floats.
- *
- * Since: 4.6
- */
-void
-gdk_texture_download_float (GdkTexture *texture,
- float *data,
- gsize stride)
-{
- g_return_if_fail (GDK_IS_TEXTURE (texture));
- g_return_if_fail (data != NULL);
- g_return_if_fail (stride >= gdk_texture_get_width (texture) * 4);
-
- gdk_texture_do_download (texture,
- GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED,
- (guchar *) data,
- stride);
-}
-
GdkMemoryFormat
gdk_texture_get_format (GdkTexture *self)
{
gsize offset;
};
-static float
-gdk_memory_format_precsion (GdkMemoryFormat format)
-{
- switch (format)
- {
- case GDK_MEMORY_R8G8B8:
- case GDK_MEMORY_B8G8R8:
- case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
- case GDK_MEMORY_A8R8G8B8_PREMULTIPLIED:
- case GDK_MEMORY_R8G8B8A8_PREMULTIPLIED:
- case GDK_MEMORY_B8G8R8A8:
- case GDK_MEMORY_A8R8G8B8:
- case GDK_MEMORY_R8G8B8A8:
- case GDK_MEMORY_A8B8G8R8:
- return 1/256.f;
-
- case GDK_MEMORY_R16G16B16:
- case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
- case GDK_MEMORY_R16G16B16A16:
- return 1/65536.f;
-
- case GDK_MEMORY_R16G16B16_FLOAT:
- case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
- case GDK_MEMORY_R16G16B16A16_FLOAT:
- return 0.0009765625f;
-
- case GDK_MEMORY_R32G32B32_FLOAT:
- case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
- case GDK_MEMORY_R32G32B32A32_FLOAT:
- return FLT_EPSILON;
-
- case GDK_MEMORY_N_FORMATS:
- default:
- g_assert_not_reached ();
- return 0;
- }
-}
-
static gsize
gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format)
{
g_free (test_data);
}
-static void
-compare_textures_float (GdkTexture *expected,
- GdkTexture *test,
- float eps,
- gboolean has_alpha)
-{
- static int R = 0;
- static int G = 1;
- static int B = 2;
- static int A = 3;
- float *expected_data, *test_data;
- int width, height;
- int x, y;
-
- g_assert_cmpint (gdk_texture_get_width (expected), ==, gdk_texture_get_width (test));
- g_assert_cmpint (gdk_texture_get_height (expected), ==, gdk_texture_get_height (test));
-
- width = gdk_texture_get_width (expected);
- height = gdk_texture_get_height (expected);
-
- expected_data = g_new (float, width * height * 4);
- gdk_texture_download_float (expected, expected_data, width * 4);
-
- test_data = g_new (float, width * height * 4);
- gdk_texture_download_float (test, test_data, width * 4);
-
- for (y = 0; y < height; y++)
- {
- for (x = 0; x < width; x++)
- {
- g_assert_cmpfloat_with_epsilon (expected_data[y * width + 4 * x + R], test_data[y * width + 4 * x + R], eps);
- g_assert_cmpfloat_with_epsilon (expected_data[y * width + 4 * x + G], test_data[y * width + 4 * x + G], eps);
- g_assert_cmpfloat_with_epsilon (expected_data[y * width + 4 * x + B], test_data[y * width + 4 * x + B], eps);
- if (has_alpha)
- g_assert_cmpfloat_with_epsilon (expected_data[y * width + 4 * x + A], test_data[y * width + 4 * x + A], eps);
- else
- g_assert_cmpfloat (1.0, ==, test_data[y * width + 4 * x + A]);
- }
- }
-
- g_free (expected_data);
- g_free (test_data);
-}
-
static GdkTexture *
upload_to_gl (GdkTexture *texture)
{
g_object_unref (test);
}
-static void
-test_download_float_1x1 (gconstpointer data)
-{
- GdkMemoryFormat format;
- TextureMethod method;
- GdkTexture *expected, *test;
- gsize i;
-
- decode (data, &format, &method);
-
- for (i = 0; i < N; i++)
- {
- GdkRGBA color;
-
- create_random_color (&color);
- expected = create_texture (GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED, TEXTURE_METHOD_LOCAL, 1, 1, &color);
- test = create_texture (format, method, 1, 1, &color);
-
- compare_textures_float (expected, test,
- gdk_memory_format_precsion (format),
- gdk_memory_format_has_alpha (format));
-
- g_object_unref (expected);
- g_object_unref (test);
- }
-}
-
-static void
-test_download_float_4x4 (gconstpointer data)
-{
- GdkMemoryFormat format;
- TextureMethod method;
- GdkTexture *expected, *test;
- gsize i;
-
- decode (data, &format, &method);
-
- for (i = 0; i < N; i++)
- {
- GdkRGBA color;
-
- create_random_color (&color);
- expected = create_texture (GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED, TEXTURE_METHOD_LOCAL, 4, 4, &color);
- test = create_texture (format, method, 4, 4, &color);
-
- compare_textures_float (expected, test,
- gdk_memory_format_precsion (format),
- gdk_memory_format_has_alpha (format));
-
- g_object_unref (expected);
- g_object_unref (test);
- }
-}
-
-
static void
add_test (const char *name,
GTestDataFunc func)
add_test ("/memorytexture/download_1x1", test_download_1x1);
add_test ("/memorytexture/download_4x4", test_download_4x4);
add_test ("/memorytexture/download_192x192", test_download_192x192);
- add_test ("/memorytexture/download_float_1x1", test_download_float_1x1);
- add_test ("/memorytexture/download_float_4x4", test_download_float_4x4);
gl_renderer = gsk_gl_renderer_new ();
if (!gsk_renderer_realize (gl_renderer, NULL, NULL))
{
/* Make sure to initialize the pixel to anything but red */
guint32 pixel = 0;
- float float_pixel[4] = { INFINITY, INFINITY, INFINITY, INFINITY };
g_test_message ("Checking texture access in thread %p...", g_thread_self());
/* Just to be sure */
/* download the pixel */
gdk_texture_download (texture, (guchar *) &pixel, 4);
- gdk_texture_download_float (texture, float_pixel, 4);
/* check the pixel is now red */
g_assert_cmphex (pixel, ==, 0xFFFF0000);
- g_assert_cmpfloat (float_pixel[0], ==, 1.0);
- g_assert_cmpfloat (float_pixel[1], ==, 0.0);
- g_assert_cmpfloat (float_pixel[2], ==, 0.0);
- g_assert_cmpfloat (float_pixel[3], ==, 1.0);
g_test_message ("...done in thread %p", g_thread_self());
}
projects / gtk4.git / commitdiff