png: move DSP functions to their own DSP context.

1 files changed, 40 insertions, 0 deletions

diff --git a/libavcodec/pngdsp.h b/libavcodec/pngdsp.h
new file mode 100644
index 0000000000..98d29a8a2f
--- /dev/null
+++ b/libavcodec/pngdsp.h
@@ -0,0 +1,40 @@
+/*
+ * PNG image format
+ * Copyright (c) 2008 Loren Merrit <lorenm@u.washington.edu>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_PNGDSP_H
+#define AVCODEC_PNGDSP_H
+
+#include <stdint.h>
+
+typedef struct PNGDSPContext {
+    void (*add_bytes_l2)(uint8_t *dst  /* align 16 */,
+                         uint8_t *src1 /* align 16 */,
+                         uint8_t *src2 /* align 16 */, int w);
+
+    /* this might write to dst[w] */
+    void (*add_paeth_prediction)(uint8_t *dst, uint8_t *src,
+                                 uint8_t *top, int w, int bpp);
+} PNGDSPContext;
+
+void ff_pngdsp_init(PNGDSPContext *dsp);
+void ff_pngdsp_init_x86(PNGDSPContext *dsp);
+
+#endif /* AVCDODEC_PNGDSP_H */