1 files changed, 48 insertions, 0 deletions
diff --git a/video/out/gpu/error_diffusion.h b/video/out/gpu/error_diffusion.h
new file mode 100644
index 0000000000..6bdcea16f7
--- /dev/null
+++ b/video/out/gpu/error_diffusion.h
@@ -0,0 +1,48 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MP_GL_ERROR_DIFFUSION
+#define MP_GL_ERROR_DIFFUSION
+
+#include "shader_cache.h"
+
+// defines the border of all error diffusion kernels
+#define EF_MIN_DELTA_X (-2)
+#define EF_MAX_DELTA_X  (2)
+#define EF_MAX_DELTA_Y  (2)
+
+struct error_diffusion_kernel {
+    const char *name;
+
+    // The minimum value such that a (y, x) -> (y, x + y * shift) mapping will
+    // make all error pushing operations affect next column (and after it) only.
+    int shift;
+
+    // The diffusion factor for (y, x) is pattern[y][x - EF_MIN_DELTA_X] / divisor.
+    int pattern[EF_MAX_DELTA_Y + 1][EF_MAX_DELTA_X - EF_MIN_DELTA_X + 1];
+    int divisor;
+};
+
+extern const struct error_diffusion_kernel mp_error_diffusion_kernels[];
+
+const struct error_diffusion_kernel *mp_find_error_diffusion_kernel(const char *name);
+int mp_ef_compute_shared_memory_size(const struct error_diffusion_kernel *k, int height);
+void pass_error_diffusion(struct gl_shader_cache *sc,
+                          const struct error_diffusion_kernel *k,
+                          int tex, int width, int height, int depth, int block_size);
+
+#endif /* MP_GL_ERROR_DIFFUSION */