1010102, 101010x, 888x in sw

Same sort of deal as before, now with all three new formats.
While I was at it, I made sure RGBA 8888 and BGRA 8888 both work too.

We don't want the 101010's in lowp, but 888x should be fine.

After looking at the DM images on monitors at work, I decided to
re-enable dither even on 10-bit images.

Looking at the GMs in 888x or 101010x is interesting... I think we must
not be clearing the memory allocated for layers?  Seems like we want to
allocate layers as 8888?

Change-Id: I3a85b4f00877792a6425a7e7eb31eacb04ae9218
Reviewed-on: https://skia-review.googlesource.com/101640
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/images/SkImageEncoderFns.h b/src/images/SkImageEncoderFns.h
index 52c547616d..8637541720 100644
--- a/src/images/SkImageEncoderFns.h
+++ b/src/images/SkImageEncoderFns.h
@@ -267,6 +267,64 @@ static inline void transform_scanline_4444(char* SK_RESTRICT dst, const char* SK
     }
 }
 
+// 888x is opaque RGB in four bytes, with 8 junk bits.  We convert that to 3 byte RGB.
+static inline void transform_scanline_888x(char* dst, const char* src,
+                                           int width, int, const SkPMColor*) {
+    while (width --> 0) {
+        dst[0] = src[0];
+        dst[1] = src[1];
+        dst[2] = src[2];
+        dst += 3;
+        src += 4;
+    }
+}
+
+// 101010x is opaque RGB in four bytes, with 2 bits junk.  We convert to 6 byte RGB (big endian).
+static inline void transform_scanline_101010x(char* dst, const char* src,
+                                              int width, int, const SkPMColor*) {
+    auto d = (      uint16_t*)dst;
+    auto s = (const uint32_t*)src;
+    while (width --> 0) {
+        uint32_t r = (*s >>  0) & 1023,
+                 g = (*s >> 10) & 1023,
+                 b = (*s >> 20) & 1023;
+
+        // Scale 10-bit unorms to 16-bit by replicating the most significant bits.
+        r = (r << 6) | (r >> 4);
+        g = (g << 6) | (g >> 4);
+        b = (b << 6) | (b >> 4);
+
+        // Store big-endian.
+        d[0] = (r >> 8) | (r << 8);
+        d[1] = (g >> 8) | (g << 8);
+        d[2] = (b >> 8) | (b << 8);
+
+        d += 3;  // 3 channels
+        s += 1;  // 1 whole pixel
+    }
+}
+
+static inline void transform_scanline_1010102(char* dst, const char* src,
+                                              int width, int, const SkPMColor*) {
+    SkJumper_MemoryCtx src_ctx = { (void*)src, 0 },
+                       dst_ctx = { (void*)dst, 0 };
+    SkRasterPipeline_<256> p;
+    p.append(SkRasterPipeline::load_1010102, &src_ctx);
+    p.append(SkRasterPipeline::store_u16_be, &dst_ctx);
+    p.run(0,0, width,1);
+}
+
+static inline void transform_scanline_1010102_premul(char* dst, const char* src,
+                                                     int width, int, const SkPMColor*) {
+    SkJumper_MemoryCtx src_ctx = { (void*)src, 0 },
+                       dst_ctx = { (void*)dst, 0 };
+    SkRasterPipeline_<256> p;
+    p.append(SkRasterPipeline::load_1010102, &src_ctx);
+    p.append(SkRasterPipeline::unpremul);
+    p.append(SkRasterPipeline::store_u16_be, &dst_ctx);
+    p.run(0,0, width,1);
+}
+
 /**
  * Transform from kRGBA_F16 to 8-bytes-per-pixel RGBA.
  */