summaryrefslogtreecommitdiff
path: root/libswscale/hscale_fast_bilinear.c
diff options
context:
space:
mode:
Diffstat (limited to 'libswscale/hscale_fast_bilinear.c')
-rw-r--r--libswscale/hscale_fast_bilinear.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/libswscale/hscale_fast_bilinear.c b/libswscale/hscale_fast_bilinear.c
new file mode 100644
index 0000000000..82d6177bde
--- /dev/null
+++ b/libswscale/hscale_fast_bilinear.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "swscale_internal.h"
+
+void ff_hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,
+ const uint8_t *src, int srcW, int xInc)
+{
+ int i;
+ unsigned int xpos = 0;
+ for (i = 0; i < dstWidth; i++) {
+ register unsigned int xx = xpos >> 16;
+ register unsigned int xalpha = (xpos & 0xFFFF) >> 9;
+ dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha;
+ xpos += xInc;
+ }
+ for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--)
+ dst[i] = src[srcW-1]*128;
+}
+
+void ff_hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2,
+ int dstWidth, const uint8_t *src1,
+ const uint8_t *src2, int srcW, int xInc)
+{
+ int i;
+ unsigned int xpos = 0;
+ for (i = 0; i < dstWidth; i++) {
+ register unsigned int xx = xpos >> 16;
+ register unsigned int xalpha = (xpos & 0xFFFF) >> 9;
+ dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha);
+ dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha);
+ xpos += xInc;
+ }
+ for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) {
+ dst1[i] = src1[srcW-1]*128;
+ dst2[i] = src2[srcW-1]*128;
+ }
+}