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authorH. Peter Anvin <hpa@zytor.com>2006-09-05 11:04:57 -0700
committerH. Peter Anvin <hpa@zytor.com>2006-09-05 11:04:57 -0700
commit6eecf1d470027b8af4a24e7e20a278b8aca95abc (patch)
treede01e219142643c2f373ac724572a516fec212b9 /com32/lib/jpeg/grey.c
parentfdb9307fb79e715350a87fc70e13149790413baa (diff)
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Factor tinyjpeg out by colorspace, so we don't pull in everything
Diffstat (limited to 'com32/lib/jpeg/grey.c')
-rw-r--r--com32/lib/jpeg/grey.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/com32/lib/jpeg/grey.c b/com32/lib/jpeg/grey.c
new file mode 100644
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+/*
+ * Small jpeg decoder library
+ *
+ * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the author nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "tinyjpeg.h"
+#include "tinyjpeg-internal.h"
+
+/**
+ * YCrCb -> Grey (1x1)
+ * .---.
+ * | 1 |
+ * `---'
+ */
+static void YCrCB_to_Grey_1x1(struct jdec_private *priv)
+{
+ const unsigned char *y;
+ unsigned char *p;
+ unsigned int i;
+ int offset_to_next_row;
+
+ p = priv->plane[0];
+ y = priv->Y;
+ offset_to_next_row = priv->width;
+
+ for (i=0; i<8; i++) {
+ memcpy(p, y, 8);
+ y+=8;
+ p += offset_to_next_row;
+ }
+}
+
+/**
+ * YCrCb -> Grey (2x1)
+ * .-------.
+ * | 1 | 2 |
+ * `-------'
+ */
+static void YCrCB_to_Grey_2x1(struct jdec_private *priv)
+{
+ const unsigned char *y;
+ unsigned char *p;
+ unsigned int i;
+
+ p = priv->plane[0];
+ y = priv->Y;
+
+ for (i=0; i<8; i++) {
+ memcpy(p, y, 16);
+ y += 16;
+ p += priv->width;
+ }
+}
+
+
+/**
+ * YCrCb -> Grey (1x2)
+ * .---.
+ * | 1 |
+ * |---|
+ * | 2 |
+ * `---'
+ */
+static void YCrCB_to_Grey_1x2(struct jdec_private *priv)
+{
+ const unsigned char *y;
+ unsigned char *p;
+ unsigned int i;
+
+ p = priv->plane[0];
+ y = priv->Y;
+
+ for (i=0; i<16; i++) {
+ memcpy(p, y, 8);
+ y += 8;
+ p += priv->width;
+ }
+}
+
+/**
+ * YCrCb -> Grey (2x2)
+ * .-------.
+ * | 1 | 2 |
+ * |---+---|
+ * | 3 | 4 |
+ * `-------'
+ */
+static void YCrCB_to_Grey_2x2(struct jdec_private *priv)
+{
+ const unsigned char *y;
+ unsigned char *p;
+ unsigned int i;
+
+ p = priv->plane[0];
+ y = priv->Y;
+
+ for (i=0; i<16; i++) {
+ memcpy(p, y, 16);
+ y += 16;
+ p += priv->width;
+ }
+}
+
+static int initialize_grey(struct jdec_private *priv,
+ unsigned int *bytes_per_blocklines,
+ unsigned int *bytes_per_mcu)
+{
+ if (priv->components[0] == NULL)
+ priv->components[0] = (uint8_t *)malloc(priv->width * priv->height * 3);
+ bytes_per_blocklines[0] = priv->width * 3;
+ bytes_per_mcu[0] = 3*8;
+
+ return !priv->components[0];
+}
+
+static const struct tinyjpeg_colorspace format_grey =
+ {
+ {
+ YCrCB_to_Grey_1x1,
+ YCrCB_to_Grey_1x2,
+ YCrCB_to_Grey_2x1,
+ YCrCB_to_Grey_2x2,
+ },
+ tinyjpeg_decode_mcu_1comp_table,
+ initialize_grey
+ };
+
+const tinyjpeg_colorspace_t TINYJPEG_FMT_GREY = &format_grey;