draw: Rename files in draw directory.

1 files changed, 235 insertions, 0 deletions

diff --git a/draw/draw_unpack.c b/draw/draw_unpack.c
new file mode 100644
index 00000000..2c7cb452
--- /dev/null
+++ b/draw/draw_unpack.c
@@ -0,0 +1,235 @@
+#include "fitz.h"
+
+/* Unpack image samples and optionally pad pixels with opaque alpha */
+
+#define get1(buf,x) ((buf[x >> 3] >> ( 7 - (x & 7) ) ) & 1 )
+#define get2(buf,x) ((buf[x >> 2] >> ( ( 3 - (x & 3) ) << 1 ) ) & 3 )
+#define get4(buf,x) ((buf[x >> 1] >> ( ( 1 - (x & 1) ) << 2 ) ) & 15 )
+#define get8(buf,x) (buf[x])
+#define get16(buf,x) (buf[x << 1])
+
+static unsigned char get1tab1[256][8];
+static unsigned char get1tab1p[256][16];
+static unsigned char get1tab255[256][8];
+static unsigned char get1tab255p[256][16];
+
+static void
+initget1tables(void)
+{
+	static int once = 0;
+	unsigned char bits[1];
+	int i, k, x;
+
+	/* TODO: mutex lock here */
+
+	if (once)
+		return;
+
+	for (i = 0; i < 256; i++)
+	{
+		bits[0] = i;
+		for (k = 0; k < 8; k++)
+		{
+			x = get1(bits, k);
+
+			get1tab1[i][k] = x;
+			get1tab1p[i][k * 2] = x;
+			get1tab1p[i][k * 2 + 1] = 255;
+
+			get1tab255[i][k] = x * 255;
+			get1tab255p[i][k * 2] = x * 255;
+			get1tab255p[i][k * 2 + 1] = 255;
+		}
+	}
+
+	once = 1;
+}
+
+void
+fz_unpacktile(fz_pixmap *dst, unsigned char * restrict src, int n, int depth, int stride, int scale)
+{
+	int pad, x, y, k;
+	int w = dst->w;
+
+	pad = 0;
+	if (dst->n > n)
+		pad = 255;
+
+	if (depth == 1)
+		initget1tables();
+
+	if (scale == 0)
+	{
+		switch (depth)
+		{
+		case 1: scale = 255; break;
+		case 2: scale = 85; break;
+		case 4: scale = 17; break;
+		}
+	}
+
+	for (y = 0; y < dst->h; y++)
+	{
+		unsigned char *sp = src + y * stride;
+		unsigned char *dp = dst->samples + y * (dst->w * dst->n);
+
+		/* Specialized loops */
+
+		if (n == 1 && depth == 1 && scale == 1 && !pad)
+		{
+			int w3 = w >> 3;
+			for (x = 0; x < w3; x++)
+			{
+				memcpy(dp, get1tab1[*sp++], 8);
+				dp += 8;
+			}
+			x = x << 3;
+			if (x < w)
+				memcpy(dp, get1tab1[*sp], w - x);
+		}
+
+		else if (n == 1 && depth == 1 && scale == 255 && !pad)
+		{
+			int w3 = w >> 3;
+			for (x = 0; x < w3; x++)
+			{
+				memcpy(dp, get1tab255[*sp++], 8);
+				dp += 8;
+			}
+			x = x << 3;
+			if (x < w)
+				memcpy(dp, get1tab255[*sp], w - x);
+		}
+
+		else if (n == 1 && depth == 1 && scale == 1 && pad)
+		{
+			int w3 = w >> 3;
+			for (x = 0; x < w3; x++)
+			{
+				memcpy(dp, get1tab1p[*sp++], 16);
+				dp += 16;
+			}
+			x = x << 3;
+			if (x < w)
+				memcpy(dp, get1tab1p[*sp], (w - x) << 1);
+		}
+
+		else if (n == 1 && depth == 1 && scale == 255 && pad)
+		{
+			int w3 = w >> 3;
+			for (x = 0; x < w3; x++)
+			{
+				memcpy(dp, get1tab255p[*sp++], 16);
+				dp += 16;
+			}
+			x = x << 3;
+			if (x < w)
+				memcpy(dp, get1tab255p[*sp], (w - x) << 1);
+		}
+
+		else if (depth == 8 && !pad)
+		{
+			int len = w * n;
+			while (len--)
+				*dp++ = *sp++;
+		}
+
+		else if (depth == 8 && pad)
+		{
+			for (x = 0; x < w; x++)
+			{
+				for (k = 0; k < n; k++)
+					*dp++ = *sp++;
+				*dp++ = 255;
+			}
+		}
+
+		else
+		{
+			int b = 0;
+			for (x = 0; x < w; x++)
+			{
+				for (k = 0; k < n; k++)
+				{
+					switch (depth)
+					{
+					case 1: *dp++ = get1(sp, b) * scale; break;
+					case 2: *dp++ = get2(sp, b) * scale; break;
+					case 4: *dp++ = get4(sp, b) * scale; break;
+					case 8: *dp++ = get8(sp, b); break;
+					case 16: *dp++ = get16(sp, b); break;
+					}
+					b++;
+				}
+				if (pad)
+					*dp++ = 255;
+			}
+		}
+	}
+}
+
+/* Apply decode array */
+
+void
+fz_decodeindexedtile(fz_pixmap *pix, float *decode, int maxval)
+{
+	int add[FZ_MAXCOLORS];
+	int mul[FZ_MAXCOLORS];
+	unsigned char *p = pix->samples;
+	int len = pix->w * pix->h;
+	int n = pix->n - 1;
+	int needed;
+	int k;
+
+	needed = 0;
+	for (k = 0; k < n; k++)
+	{
+		int min = decode[k * 2] * 256;
+		int max = decode[k * 2 + 1] * 256;
+		add[k] = min;
+		mul[k] = (max - min) / maxval;
+		needed |= min != 0 || max != maxval * 256;
+	}
+
+	if (!needed)
+		return;
+
+	while (len--)
+	{
+		for (k = 0; k < n; k++)
+			p[k] = (add[k] + (((p[k] << 8) * mul[k]) >> 8)) >> 8;
+		p += n + 1;
+	}
+}
+
+void
+fz_decodetile(fz_pixmap *pix, float *decode)
+{
+	int add[FZ_MAXCOLORS];
+	int mul[FZ_MAXCOLORS];
+	unsigned char *p = pix->samples;
+	int len = pix->w * pix->h;
+	int n = MAX(1, pix->n - 1);
+	int needed;
+	int k;
+
+	needed = 0;
+	for (k = 0; k < n; k++)
+	{
+		int min = decode[k * 2] * 255;
+		int max = decode[k * 2 + 1] * 255;
+		add[k] = min;
+		mul[k] = max - min;
+		needed |= min != 0 || max != 255;
+	}
+
+	if (!needed)
+		return;
+
+	while (len--)
+	{
+		for (k = 0; k < n; k++)
+			p[k] = add[k] + fz_mul255(p[k], mul[k]);
+		p += pix->n;
+	}
+}