libwebp: update to 0.5.0

This commit imports libwebp 0.5.0, including AUTHORS, COPYING, ChangeLog,
NEWS, PATENTS, README and src directories. In src, only includes header
and source files.

The patches required to build it in Qt will follow in separate
commit(s).

Change-Id: I96b4961ba63c75cc7fbab158c36a0f403f254c14
Reviewed-by: aavit <eirik.aavitsland@theqtcompany.com>

1 files changed, 123 insertions, 3 deletions

diff --git a/src/3rdparty/libwebp/src/dsp/yuv.c b/src/3rdparty/libwebp/src/dsp/yuv.c
index 6f422da..f50a253 100644
--- a/src/3rdparty/libwebp/src/dsp/yuv.c
+++ b/src/3rdparty/libwebp/src/dsp/yuv.c
@@ -26,7 +26,7 @@ int32_t VP8kVToG[256], VP8kUToG[256];
 uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
 uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
 
-void VP8YUVInit(void) {
+WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {
   int i;
   if (done) {
     return;
@@ -62,7 +62,7 @@ void VP8YUVInit(void) {
 
 #else
 
-void VP8YUVInit(void) {}
+WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {}
 
 #endif  // WEBP_YUV_USE_TABLE
 
@@ -122,11 +122,12 @@ WebPSamplerRowFunc WebPSamplers[MODE_LAST];
 
 extern void WebPInitSamplersSSE2(void);
 extern void WebPInitSamplersMIPS32(void);
+extern void WebPInitSamplersMIPSdspR2(void);
 
 static volatile VP8CPUInfo yuv_last_cpuinfo_used =
     (VP8CPUInfo)&yuv_last_cpuinfo_used;
 
-void WebPInitSamplers(void) {
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplers(void) {
   if (yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
 
   WebPSamplers[MODE_RGB]       = YuvToRgbRow;
@@ -153,8 +154,127 @@ void WebPInitSamplers(void) {
       WebPInitSamplersMIPS32();
     }
 #endif  // WEBP_USE_MIPS32
+#if defined(WEBP_USE_MIPS_DSP_R2)
+    if (VP8GetCPUInfo(kMIPSdspR2)) {
+      WebPInitSamplersMIPSdspR2();
+    }
+#endif  // WEBP_USE_MIPS_DSP_R2
   }
   yuv_last_cpuinfo_used = VP8GetCPUInfo;
 }
 
 //-----------------------------------------------------------------------------
+// ARGB -> YUV converters
+
+static void ConvertARGBToY(const uint32_t* argb, uint8_t* y, int width) {
+  int i;
+  for (i = 0; i < width; ++i) {
+    const uint32_t p = argb[i];
+    y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >>  0) & 0xff,
+                     YUV_HALF);
+  }
+}
+
+void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v,
+                           int src_width, int do_store) {
+  // No rounding. Last pixel is dealt with separately.
+  const int uv_width = src_width >> 1;
+  int i;
+  for (i = 0; i < uv_width; ++i) {
+    const uint32_t v0 = argb[2 * i + 0];
+    const uint32_t v1 = argb[2 * i + 1];
+    // VP8RGBToU/V expects four accumulated pixels. Hence we need to
+    // scale r/g/b value by a factor 2. We just shift v0/v1 one bit less.
+    const int r = ((v0 >> 15) & 0x1fe) + ((v1 >> 15) & 0x1fe);
+    const int g = ((v0 >>  7) & 0x1fe) + ((v1 >>  7) & 0x1fe);
+    const int b = ((v0 <<  1) & 0x1fe) + ((v1 <<  1) & 0x1fe);
+    const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);
+    const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);
+    if (do_store) {
+      u[i] = tmp_u;
+      v[i] = tmp_v;
+    } else {
+      // Approximated average-of-four. But it's an acceptable diff.
+      u[i] = (u[i] + tmp_u + 1) >> 1;
+      v[i] = (v[i] + tmp_v + 1) >> 1;
+    }
+  }
+  if (src_width & 1) {       // last pixel
+    const uint32_t v0 = argb[2 * i + 0];
+    const int r = (v0 >> 14) & 0x3fc;
+    const int g = (v0 >>  6) & 0x3fc;
+    const int b = (v0 <<  2) & 0x3fc;
+    const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);
+    const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);
+    if (do_store) {
+      u[i] = tmp_u;
+      v[i] = tmp_v;
+    } else {
+      u[i] = (u[i] + tmp_u + 1) >> 1;
+      v[i] = (v[i] + tmp_v + 1) >> 1;
+    }
+  }
+}
+
+//-----------------------------------------------------------------------------
+
+static void ConvertRGB24ToY(const uint8_t* rgb, uint8_t* y, int width) {
+  int i;
+  for (i = 0; i < width; ++i, rgb += 3) {
+    y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
+  }
+}
+
+static void ConvertBGR24ToY(const uint8_t* bgr, uint8_t* y, int width) {
+  int i;
+  for (i = 0; i < width; ++i, bgr += 3) {
+    y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
+  }
+}
+
+void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,
+                             uint8_t* u, uint8_t* v, int width) {
+  int i;
+  for (i = 0; i < width; i += 1, rgb += 4) {
+    const int r = rgb[0], g = rgb[1], b = rgb[2];
+    u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2);
+    v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2);
+  }
+}
+
+//-----------------------------------------------------------------------------
+
+void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width);
+void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width);
+void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb,
+                              uint8_t* u, uint8_t* v, int width);
+
+void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width);
+void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v,
+                            int src_width, int do_store);
+
+static volatile VP8CPUInfo rgba_to_yuv_last_cpuinfo_used =
+    (VP8CPUInfo)&rgba_to_yuv_last_cpuinfo_used;
+
+extern void WebPInitConvertARGBToYUVSSE2(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUV(void) {
+  if (rgba_to_yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
+
+  WebPConvertARGBToY = ConvertARGBToY;
+  WebPConvertARGBToUV = WebPConvertARGBToUV_C;
+
+  WebPConvertRGB24ToY = ConvertRGB24ToY;
+  WebPConvertBGR24ToY = ConvertBGR24ToY;
+
+  WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;
+
+  if (VP8GetCPUInfo != NULL) {
+#if defined(WEBP_USE_SSE2)
+    if (VP8GetCPUInfo(kSSE2)) {
+      WebPInitConvertARGBToYUVSSE2();
+    }
+#endif  // WEBP_USE_SSE2
+  }
+  rgba_to_yuv_last_cpuinfo_used = VP8GetCPUInfo;
+}