libwebp: Update to 1.5.0

thirdparty/libwebp/sharpyuv/sharpyuv.c

@@ -565,10 +565,11 @@ int SharpYuvConvertWithOptions(const void* r_ptr, const void* g_ptr,
   scaled_matrix.rgb_to_u[3] = Shift(yuv_matrix->rgb_to_u[3], sfix);
   scaled_matrix.rgb_to_v[3] = Shift(yuv_matrix->rgb_to_v[3], sfix);
 
-  return DoSharpArgbToYuv(r_ptr, g_ptr, b_ptr, rgb_step, rgb_stride,
-                          rgb_bit_depth, y_ptr, y_stride, u_ptr, u_stride,
-                          v_ptr, v_stride, yuv_bit_depth, width, height,
-                          &scaled_matrix, transfer_type);
+  return DoSharpArgbToYuv(
+      (const uint8_t*)r_ptr, (const uint8_t*)g_ptr, (const uint8_t*)b_ptr,
+      rgb_step, rgb_stride, rgb_bit_depth, (uint8_t*)y_ptr, y_stride,
+      (uint8_t*)u_ptr, u_stride, (uint8_t*)v_ptr, v_stride, yuv_bit_depth,
+      width, height, &scaled_matrix, transfer_type);
 }
 
 //------------------------------------------------------------------------------

thirdparty/libwebp/sharpyuv/sharpyuv.h

@@ -52,7 +52,7 @@ extern "C" {
 // SharpYUV API version following the convention from semver.org
 #define SHARPYUV_VERSION_MAJOR 0
 #define SHARPYUV_VERSION_MINOR 4
-#define SHARPYUV_VERSION_PATCH 0
+#define SHARPYUV_VERSION_PATCH 1
 // Version as a uint32_t. The major number is the high 8 bits.
 // The minor number is the middle 8 bits. The patch number is the low 16 bits.
 #define SHARPYUV_MAKE_VERSION(MAJOR, MINOR, PATCH) \
@@ -66,10 +66,17 @@ extern "C" {
 SHARPYUV_EXTERN int SharpYuvGetVersion(void);
 
 // RGB to YUV conversion matrix, in 16 bit fixed point.
-// y = rgb_to_y[0] * r + rgb_to_y[1] * g + rgb_to_y[2] * b + rgb_to_y[3]
-// u = rgb_to_u[0] * r + rgb_to_u[1] * g + rgb_to_u[2] * b + rgb_to_u[3]
-// v = rgb_to_v[0] * r + rgb_to_v[1] * g + rgb_to_v[2] * b + rgb_to_v[3]
-// Then y, u and v values are divided by 1<<16 and rounded.
+// y_ = rgb_to_y[0] * r + rgb_to_y[1] * g + rgb_to_y[2] * b + rgb_to_y[3]
+// u_ = rgb_to_u[0] * r + rgb_to_u[1] * g + rgb_to_u[2] * b + rgb_to_u[3]
+// v_ = rgb_to_v[0] * r + rgb_to_v[1] * g + rgb_to_v[2] * b + rgb_to_v[3]
+// Then the values are divided by 1<<16 and rounded.
+// y = (y_ + (1 << 15)) >> 16
+// u = (u_ + (1 << 15)) >> 16
+// v = (v_ + (1 << 15)) >> 16
+//
+// Typically, the offset values rgb_to_y[3], rgb_to_u[3] and rgb_to_v[3] depend
+// on the input's bit depth, e.g., rgb_to_u[3] = 1 << (rgb_bit_depth - 1 + 16).
+// See also sharpyuv_csp.h to get a predefined matrix or generate a matrix.
 typedef struct {
   int rgb_to_y[4];
   int rgb_to_u[4];
@@ -127,6 +134,8 @@ typedef enum SharpYuvTransferFunctionType {
 //     adjacent pixels on the y, u and v channels. If yuv_bit_depth > 8, they
 //     should be multiples of 2.
 // width, height: width and height of the image in pixels
+// yuv_matrix: RGB to YUV conversion matrix. The matrix values typically
+//     depend on the input's rgb_bit_depth.
 // This function calls SharpYuvConvertWithOptions with a default transfer
 // function of kSharpYuvTransferFunctionSrgb.
 SHARPYUV_EXTERN int SharpYuvConvert(const void* r_ptr, const void* g_ptr,

thirdparty/libwebp/sharpyuv/sharpyuv_csp.c

@@ -22,16 +22,16 @@ void SharpYuvComputeConversionMatrix(const SharpYuvColorSpace* yuv_color_space,
   const float kr = yuv_color_space->kr;
   const float kb = yuv_color_space->kb;
   const float kg = 1.0f - kr - kb;
-  const float cr = 0.5f / (1.0f - kb);
-  const float cb = 0.5f / (1.0f - kr);
+  const float cb = 0.5f / (1.0f - kb);
+  const float cr = 0.5f / (1.0f - kr);
 
   const int shift = yuv_color_space->bit_depth - 8;
 
   const float denom = (float)((1 << yuv_color_space->bit_depth) - 1);
   float scale_y = 1.0f;
   float add_y = 0.0f;
-  float scale_u = cr;
-  float scale_v = cb;
+  float scale_u = cb;
+  float scale_v = cr;
   float add_uv = (float)(128 << shift);
   assert(yuv_color_space->bit_depth >= 8);
 
@@ -59,31 +59,35 @@ void SharpYuvComputeConversionMatrix(const SharpYuvColorSpace* yuv_color_space,
 }
 
 // Matrices are in YUV_FIX fixed point precision.
-// WebP's matrix, similar but not identical to kRec601LimitedMatrix.
+// WebP's matrix, similar but not identical to kRec601LimitedMatrix
+// Derived using the following formulas:
+// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16
+// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128
+// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128
 static const SharpYuvConversionMatrix kWebpMatrix = {
   {16839, 33059, 6420, 16 << 16},
   {-9719, -19081, 28800, 128 << 16},
   {28800, -24116, -4684, 128 << 16},
 };
-// Kr=0.2990f Kb=0.1140f bits=8 range=kSharpYuvRangeLimited
+// Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeLimited
 static const SharpYuvConversionMatrix kRec601LimitedMatrix = {
   {16829, 33039, 6416, 16 << 16},
   {-9714, -19071, 28784, 128 << 16},
   {28784, -24103, -4681, 128 << 16},
 };
-// Kr=0.2990f Kb=0.1140f bits=8 range=kSharpYuvRangeFull
+// Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeFull
 static const SharpYuvConversionMatrix kRec601FullMatrix = {
   {19595, 38470, 7471, 0},
   {-11058, -21710, 32768, 128 << 16},
   {32768, -27439, -5329, 128 << 16},
 };
-// Kr=0.2126f Kb=0.0722f bits=8 range=kSharpYuvRangeLimited
+// Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeLimited
 static const SharpYuvConversionMatrix kRec709LimitedMatrix = {
   {11966, 40254, 4064, 16 << 16},
   {-6596, -22189, 28784, 128 << 16},
   {28784, -26145, -2639, 128 << 16},
 };
-// Kr=0.2126f Kb=0.0722f bits=8 range=kSharpYuvRangeFull
+// Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeFull
 static const SharpYuvConversionMatrix kRec709FullMatrix = {
   {13933, 46871, 4732, 0},
   {-7509, -25259, 32768, 128 << 16},

thirdparty/libwebp/sharpyuv/sharpyuv_csp.h

@@ -41,10 +41,15 @@ SHARPYUV_EXTERN void SharpYuvComputeConversionMatrix(
 
 // Enums for precomputed conversion matrices.
 typedef enum {
+  // WebP's matrix, similar but not identical to kSharpYuvMatrixRec601Limited
   kSharpYuvMatrixWebp = 0,
+  // Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeLimited
   kSharpYuvMatrixRec601Limited,
+  // Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeFull
   kSharpYuvMatrixRec601Full,
+  // Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeLimited
   kSharpYuvMatrixRec709Limited,
+  // Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeFull
   kSharpYuvMatrixRec709Full,
   kSharpYuvMatrixNum
 } SharpYuvMatrixType;