summaryrefslogtreecommitdiff
path: root/fitzdraw/porterduff.c
diff options
context:
space:
mode:
Diffstat (limited to 'fitzdraw/porterduff.c')
-rw-r--r--fitzdraw/porterduff.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/fitzdraw/porterduff.c b/fitzdraw/porterduff.c
new file mode 100644
index 00000000..8f2b9862
--- /dev/null
+++ b/fitzdraw/porterduff.c
@@ -0,0 +1,361 @@
+#include "fitz-base.h"
+#include "fitz-world.h"
+#include "fitz-draw.h"
+
+typedef unsigned char byte;
+
+/*
+ * Blend pixmap regions
+ */
+
+/* dst = src over dst */
+static void
+duff_non(byte * restrict sp0, int sw, int sn, byte * restrict dp0, int dw, int w0, int h)
+{
+ int k;
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ byte sa = sp[0];
+ byte ssa = 255 - sa;
+ for (k = 0; k < sn; k++)
+ {
+ dp[k] = sp[k] + fz_mul255(dp[k], ssa);
+ }
+ sp += sn;
+ dp += sn;
+ }
+ sp0 += sw;
+ dp0 += dw;
+ }
+}
+
+/* dst = src in msk */
+static void
+duff_nimcn(byte * restrict sp0, int sw, int sn, byte * restrict mp0, int mw, int mn, byte * restrict dp0, int dw, int w0, int h)
+{
+ int k;
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *mp = mp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ byte ma = mp[0];
+ for (k = 0; k < sn; k++)
+ dp[k] = fz_mul255(sp[k], ma);
+ sp += sn;
+ mp += mn;
+ dp += sn;
+ }
+ sp0 += sw;
+ mp0 += mw;
+ dp0 += dw;
+ }
+}
+
+/* dst = src in msk over dst */
+static void
+duff_nimon(byte * restrict sp0, int sw, int sn, byte * restrict mp0, int mw, int mn, byte * restrict dp0, int dw, int w0, int h)
+{
+ int k;
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *mp = mp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ /* TODO: validate this */
+ byte ma = mp[0];
+ byte sa = fz_mul255(sp[0], ma);
+ byte ssa = 255 - sa;
+ for (k = 0; k < sn; k++)
+ {
+ dp[k] = fz_mul255(sp[k], ma) + fz_mul255(dp[k], ssa);
+ }
+ sp += sn;
+ mp += mn;
+ dp += sn;
+ }
+ sp0 += sw;
+ mp0 += mw;
+ dp0 += dw;
+ }
+}
+
+static void duff_1o1(byte * restrict sp0, int sw, byte * restrict dp0, int dw, int w0, int h)
+{
+ /* duff_non(sp0, sw, 1, dp0, dw, w0, h); */
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ dp[0] = sp[0] + fz_mul255(dp[0], 255 - sp[0]);
+ sp ++;
+ dp ++;
+ }
+ sp0 += sw;
+ dp0 += dw;
+ }
+}
+
+static void duff_4o4(byte *sp0, int sw, byte *dp0, int dw, int w0, int h)
+{
+ /* duff_non(sp0, sw, 4, dp0, dw, w0, h); */
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ byte ssa = 255 - sp[0];
+ dp[0] = sp[0] + fz_mul255(dp[0], ssa);
+ dp[1] = sp[1] + fz_mul255(dp[1], ssa);
+ dp[2] = sp[2] + fz_mul255(dp[2], ssa);
+ dp[3] = sp[3] + fz_mul255(dp[3], ssa);
+ sp += 4;
+ dp += 4;
+ }
+ sp0 += sw;
+ dp0 += dw;
+ }
+}
+
+static void duff_1i1c1(byte * restrict sp0, int sw, byte * restrict mp0, int mw, byte * restrict dp0, int dw, int w0, int h)
+{
+ /* duff_nimcn(sp0, sw, 1, mp0, mw, 1, dp0, dw, w0, h); */
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *mp = mp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ dp[0] = fz_mul255(sp[0], mp[0]);
+ sp ++;
+ mp ++;
+ dp ++;
+ }
+ sp0 += sw;
+ mp0 += mw;
+ dp0 += dw;
+ }
+}
+
+static void duff_4i1c4(byte * restrict sp0, int sw, byte * restrict mp0, int mw, byte * restrict dp0, int dw, int w0, int h)
+{
+ /* duff_nimcn(sp0, sw, 4, mp0, mw, 1, dp0, dw, w0, h); */
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *mp = mp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ byte ma = mp[0];
+ dp[0] = fz_mul255(sp[0], ma);
+ dp[1] = fz_mul255(sp[1], ma);
+ dp[2] = fz_mul255(sp[2], ma);
+ dp[3] = fz_mul255(sp[3], ma);
+ sp += 4;
+ mp += 1;
+ dp += 4;
+ }
+ sp0 += sw;
+ mp0 += mw;
+ dp0 += dw;
+ }
+}
+
+static void duff_1i1o1(byte * restrict sp0, int sw, byte * restrict mp0, int mw, byte * restrict dp0, int dw, int w0, int h)
+{
+ /* duff_nimon(sp0, sw, 1, mp0, mw, 1, dp0, dw, w0, h); */
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *mp = mp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ byte ma = mp[0];
+ byte sa = fz_mul255(sp[0], ma);
+ byte ssa = 255 - sa;
+ dp[0] = fz_mul255(sp[0], ma) + fz_mul255(dp[0], ssa);
+ sp ++;
+ mp ++;
+ dp ++;
+ }
+ sp0 += sw;
+ mp0 += mw;
+ dp0 += dw;
+ }
+}
+
+static void duff_4i1o4(byte * restrict sp0, int sw, byte * restrict mp0, int mw, byte * restrict dp0, int dw, int w0, int h)
+{
+ /* duff_nimon(sp0, sw, 4, mp0, mw, 1, dp0, dw, w0, h); */
+ while (h--)
+ {
+ byte *sp = sp0;
+ byte *mp = mp0;
+ byte *dp = dp0;
+ int w = w0;
+ while (w--)
+ {
+ byte ma = mp[0];
+ byte sa = fz_mul255(sp[0], ma);
+ byte ssa = 255 - sa;
+ dp[0] = fz_mul255(sp[0], ma) + fz_mul255(dp[0], ssa);
+ dp[1] = fz_mul255(sp[1], ma) + fz_mul255(dp[1], ssa);
+ dp[2] = fz_mul255(sp[2], ma) + fz_mul255(dp[2], ssa);
+ dp[3] = fz_mul255(sp[3], ma) + fz_mul255(dp[3], ssa);
+ sp += 4;
+ mp += 1;
+ dp += 4;
+ }
+ sp0 += sw;
+ mp0 += mw;
+ dp0 += dw;
+ }
+}
+
+/*
+ * Path and text masks
+ */
+
+static void path_1c1(byte * restrict src, byte cov, int len, byte * restrict dst)
+{
+ while (len--)
+ {
+ cov += *src; *src = 0; src++;
+ *dst++ = cov;
+ }
+}
+
+static void path_1o1(byte * restrict src, byte cov, int len, byte * restrict dst)
+{
+ while (len--)
+ {
+ cov += *src; *src = 0; src++;
+ dst[0] = cov + fz_mul255(dst[0], 255 - cov);
+ dst++;
+ }
+}
+
+// With 4 In 1 Over 4
+static void path_w4i1o4(byte * restrict argb, byte * restrict src, byte cov, int len, byte * restrict dst)
+{
+ byte alpha = argb[0];
+ byte r = argb[4];
+ byte g = argb[5];
+ byte b = argb[6];
+ while (len--)
+ {
+ byte ca;
+ cov += *src; *src = 0; src++;
+ ca = fz_mul255(cov, alpha);
+ dst[0] = ca + fz_mul255(dst[0], 255 - ca);
+ dst[1] = fz_mul255((short)r - dst[1], ca) + dst[1];
+ dst[2] = fz_mul255((short)g - dst[2], ca) + dst[2];
+ dst[3] = fz_mul255((short)b - dst[3], ca) + dst[3];
+ dst += 4;
+ }
+}
+
+static void text_1c1(byte * restrict src0, int srcw, byte * restrict dst0, int dstw, int w0, int h)
+{
+ while (h--)
+ {
+ byte * restrict src = src0;
+ byte * restrict dst = dst0;
+ int w = w0;
+ while (w--)
+ {
+ *dst++ = *src++;
+ }
+ src0 += srcw;
+ dst0 += dstw;
+ }
+}
+
+static void text_1o1(byte * restrict src0, int srcw, byte * restrict dst0, int dstw, int w0, int h)
+{
+ while (h--)
+ {
+ byte *src = src0;
+ byte *dst = dst0;
+ int w = w0;
+ while (w--)
+ {
+ dst[0] = src[0] + fz_mul255(dst[0], 255 - src[0]);
+ src++;
+ dst++;
+ }
+ src0 += srcw;
+ dst0 += dstw;
+ }
+}
+
+static void text_w4i1o4(byte * restrict argb, byte * restrict src0, int srcw, byte * restrict dst0, int dstw, int w0, int h)
+{
+ unsigned char alpha = argb[0];
+ unsigned char r = argb[4];
+ unsigned char g = argb[5];
+ unsigned char b = argb[6];
+ while (h--)
+ {
+ byte *src = src0;
+ byte *dst = dst0;
+ int w = w0;
+ while (w--)
+ {
+ byte ca = fz_mul255(src[0], alpha);
+ dst[0] = ca + fz_mul255(dst[0], 255 - ca);
+ dst[1] = fz_mul255((short)r - dst[1], ca) + dst[1];
+ dst[2] = fz_mul255((short)g - dst[2], ca) + dst[2];
+ dst[3] = fz_mul255((short)b - dst[3], ca) + dst[3];
+ src ++;
+ dst += 4;
+ }
+ src0 += srcw;
+ dst0 += dstw;
+ }
+}
+
+/*
+ * ... and the function pointers
+ */
+
+void (*fz_duff_non)(byte*,int,int,byte*,int,int,int) = duff_non;
+void (*fz_duff_nimcn)(byte*,int,int,byte*,int,int,byte*,int,int,int) = duff_nimcn;
+void (*fz_duff_nimon)(byte*,int,int,byte*,int,int,byte*,int,int,int) = duff_nimon;
+void (*fz_duff_1o1)(byte*,int,byte*,int,int,int) = duff_1o1;
+void (*fz_duff_4o4)(byte*,int,byte*,int,int,int) = duff_4o4;
+void (*fz_duff_1i1c1)(byte*,int,byte*,int,byte*,int,int,int) = duff_1i1c1;
+void (*fz_duff_4i1c4)(byte*,int,byte*,int,byte*,int,int,int) = duff_4i1c4;
+void (*fz_duff_1i1o1)(byte*,int,byte*,int,byte*,int,int,int) = duff_1i1o1;
+void (*fz_duff_4i1o4)(byte*,int,byte*,int,byte*,int,int,int) = duff_4i1o4;
+
+void (*fz_path_1c1)(byte*,byte,int,byte*) = path_1c1;
+void (*fz_path_1o1)(byte*,byte,int,byte*) = path_1o1;
+void (*fz_path_w4i1o4)(byte*,byte*,byte,int,byte*) = path_w4i1o4;
+
+void (*fz_text_1c1)(byte*,int,byte*,int,int,int) = text_1c1;
+void (*fz_text_1o1)(byte*,int,byte*,int,int,int) = text_1o1;
+void (*fz_text_w4i1o4)(byte*,byte*,int,byte*,int,int,int) = text_w4i1o4;
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-24 12:19:17 +0000