Expose CStretchEngine fixed-point constants
-- Also expose helper methods.
-- fix index name leftover from previous cl.
Change-Id: I34365f9cdd8a358da74e34e5d02660bca4ae1a39
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/82154
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/core/fxcodec/progressive_decoder.cpp b/core/fxcodec/progressive_decoder.cpp
index 899e92a..dec343c 100644
--- a/core/fxcodec/progressive_decoder.cpp
+++ b/core/fxcodec/progressive_decoder.cpp
@@ -83,14 +83,14 @@
int dest_col = FXSYS_roundf((float)dest_col_f);
PixelWeight* pWeight = GetPixelWeight(dest_col);
pWeight->m_SrcStart = pWeight->m_SrcEnd = src_col;
- pWeight->m_Weights[0] = 65536;
+ pWeight->m_Weights[0] = CStretchEngine::kFixedPointOne;
pWeight->m_Weights[1] = 0;
if (src_col == src_len - 1 && dest_col < dest_len - 1) {
for (int dest_col_index = pre_dest_col + 1; dest_col_index < dest_len;
dest_col_index++) {
pWeight = GetPixelWeight(dest_col_index);
pWeight->m_SrcStart = pWeight->m_SrcEnd = src_col;
- pWeight->m_Weights[0] = 65536;
+ pWeight->m_Weights[0] = CStretchEngine::kFixedPointOne;
pWeight->m_Weights[1] = 0;
}
return;
@@ -101,10 +101,10 @@
pWeight = GetPixelWeight(dest_col_index);
pWeight->m_SrcStart = src_col - 1;
pWeight->m_SrcEnd = src_col;
- pWeight->m_Weights[0] =
- FXSYS_roundf((float)(((float)dest_col - (float)dest_col_index) /
- (float)dest_col_len * 65536));
- pWeight->m_Weights[1] = 65536 - pWeight->m_Weights[0];
+ pWeight->m_Weights[0] = CStretchEngine::FixedFromFloat(
+ ((float)dest_col - (float)dest_col_index) / (float)dest_col_len);
+ pWeight->m_Weights[1] =
+ CStretchEngine::kFixedPointOne - pWeight->m_Weights[0];
}
pre_dest_col = dest_col;
}
@@ -115,7 +115,7 @@
int src_col = FXSYS_roundf((float)src_col_f);
PixelWeight* pWeight = GetPixelWeight(dest_col);
pWeight->m_SrcStart = pWeight->m_SrcEnd = src_col;
- pWeight->m_Weights[0] = 65536;
+ pWeight->m_Weights[0] = CStretchEngine::kFixedPointOne;
pWeight->m_Weights[1] = 0;
}
}
@@ -137,7 +137,7 @@
PixelWeight* pWeight = GetPixelWeight(dest_row);
pWeight->m_SrcStart = dest_row;
pWeight->m_SrcEnd = dest_row;
- pWeight->m_Weights[0] = 65536;
+ pWeight->m_Weights[0] = CStretchEngine::kFixedPointOne;
pWeight->m_Weights[1] = 0;
}
return;
@@ -155,7 +155,7 @@
PixelWeight* pWeight = GetPixelWeight(dest_row);
pWeight->m_SrcStart = start_step;
pWeight->m_SrcEnd = start_step;
- pWeight->m_Weights[0] = 65536;
+ pWeight->m_Weights[0] = CStretchEngine::kFixedPointOne;
pWeight->m_Weights[1] = 0;
}
return;
@@ -165,16 +165,17 @@
PixelWeight* pWeight = GetPixelWeight(start_step);
pWeight->m_SrcStart = start_step;
pWeight->m_SrcEnd = start_step;
- pWeight->m_Weights[0] = 65536;
+ pWeight->m_Weights[0] = CStretchEngine::kFixedPointOne;
pWeight->m_Weights[1] = 0;
}
for (int dest_row = start_step + 1; dest_row < end_step; dest_row++) {
PixelWeight* pWeight = GetPixelWeight(dest_row);
pWeight->m_SrcStart = start_step;
pWeight->m_SrcEnd = end_step;
- pWeight->m_Weights[0] =
- FXSYS_roundf((float)(end_step - dest_row) / (float)length * 65536);
- pWeight->m_Weights[1] = 65536 - pWeight->m_Weights[0];
+ pWeight->m_Weights[0] = CStretchEngine::FixedFromFloat(
+ (float)(end_step - dest_row) / (float)length);
+ pWeight->m_Weights[1] =
+ CStretchEngine::kFixedPointOne - pWeight->m_Weights[0];
}
}
}
@@ -280,7 +281,8 @@
if (pPixelWeights->m_SrcStart != pPixelWeights->m_SrcEnd)
continue;
uint32_t dest_g = pPixelWeights->m_Weights[0] * src_scan[src_col];
- dest_scan[pPixelWeights->m_SrcStart] = (uint8_t)(dest_g >> 16);
+ dest_scan[pPixelWeights->m_SrcStart] =
+ CStretchEngine::PixelFromFixed(dest_g);
}
return true;
case FXDIB_Format::kRgb:
@@ -294,9 +296,9 @@
uint32_t dest_g = pPixelWeights->m_Weights[0] * (*p++);
uint32_t dest_r = pPixelWeights->m_Weights[0] * (*p);
uint8_t* pDes = &dest_scan[pPixelWeights->m_SrcStart * dest_Bpp];
- *pDes++ = (uint8_t)((dest_b) >> 16);
- *pDes++ = (uint8_t)((dest_g) >> 16);
- *pDes = (uint8_t)((dest_r) >> 16);
+ *pDes++ = CStretchEngine::PixelFromFixed(dest_b);
+ *pDes++ = CStretchEngine::PixelFromFixed(dest_g);
+ *pDes = CStretchEngine::PixelFromFixed(dest_r);
}
return true;
case FXDIB_Format::kArgb:
@@ -310,9 +312,9 @@
uint32_t dest_r = pPixelWeights->m_Weights[0] * (*p++);
uint8_t dest_a = *p;
uint8_t* pDes = &dest_scan[pPixelWeights->m_SrcStart * dest_Bpp];
- *pDes++ = (uint8_t)((dest_b) >> 16);
- *pDes++ = (uint8_t)((dest_g) >> 16);
- *pDes++ = (uint8_t)((dest_r) >> 16);
+ *pDes++ = CStretchEngine::PixelFromFixed(dest_b);
+ *pDes++ = CStretchEngine::PixelFromFixed(dest_g);
+ *pDes++ = CStretchEngine::PixelFromFixed(dest_r);
*pDes = dest_a;
}
return true;
@@ -590,7 +592,7 @@
uint32_t dest_g = 0;
dest_g += pWeight->m_Weights[0] * (*scan_src1++);
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
- *scan_des++ = (uint8_t)(dest_g >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
}
break;
case FXDIB_Format::kRgb:
@@ -604,9 +606,9 @@
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
dest_r += pWeight->m_Weights[1] * (*scan_src2++);
scan_src2 += dest_Bpp - 3;
- *scan_des++ = (uint8_t)((dest_b) >> 16);
- *scan_des++ = (uint8_t)((dest_g) >> 16);
- *scan_des++ = (uint8_t)((dest_r) >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_b);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_r);
scan_des += dest_Bpp - 3;
}
break;
@@ -620,10 +622,10 @@
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
dest_r += pWeight->m_Weights[1] * (*scan_src2++);
dest_a += pWeight->m_Weights[1] * (*scan_src2++);
- *scan_des++ = (uint8_t)((dest_b) >> 16);
- *scan_des++ = (uint8_t)((dest_g) >> 16);
- *scan_des++ = (uint8_t)((dest_r) >> 16);
- *scan_des++ = (uint8_t)((dest_a) >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_b);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_r);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_a);
}
break;
default:
@@ -867,7 +869,7 @@
uint32_t dest_g = 0;
dest_g += pWeight->m_Weights[0] * (*scan_src1++);
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
- *scan_des++ = (uint8_t)(dest_g >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
}
break;
case FXDIB_Format::kRgb:
@@ -881,9 +883,9 @@
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
dest_r += pWeight->m_Weights[1] * (*scan_src2++);
scan_src2 += dest_Bpp - 3;
- *scan_des++ = (uint8_t)((dest_b) >> 16);
- *scan_des++ = (uint8_t)((dest_g) >> 16);
- *scan_des++ = (uint8_t)((dest_r) >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_b);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_r);
scan_des += dest_Bpp - 3;
}
break;
@@ -897,10 +899,10 @@
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
dest_r += pWeight->m_Weights[1] * (*scan_src2++);
dest_a += pWeight->m_Weights[1] * (*scan_src2++);
- *scan_des++ = (uint8_t)((dest_b) >> 16);
- *scan_des++ = (uint8_t)((dest_g) >> 16);
- *scan_des++ = (uint8_t)((dest_r) >> 16);
- *scan_des++ = (uint8_t)((dest_a) >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_b);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_r);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_a);
}
break;
default:
@@ -1077,7 +1079,7 @@
pPixelWeights->m_Weights[0] * src_scan[pPixelWeights->m_SrcStart];
dest_g +=
pPixelWeights->m_Weights[1] * src_scan[pPixelWeights->m_SrcEnd];
- *dest_scan++ = (uint8_t)(dest_g >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
}
break;
case FXDIB_Format::kRgb:
@@ -1092,9 +1094,9 @@
dest_b += pPixelWeights->m_Weights[1] * (*p++);
dest_g += pPixelWeights->m_Weights[1] * (*p++);
dest_r += pPixelWeights->m_Weights[1] * (*p);
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
dest_scan += dest_Bpp - 3;
}
break;
@@ -1111,10 +1113,10 @@
dest_g += pPixelWeights->m_Weights[1] * (*p++);
dest_r += pPixelWeights->m_Weights[1] * (*p++);
dest_a += pPixelWeights->m_Weights[1] * (*p);
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
- *dest_scan++ = (uint8_t)((dest_a) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_a);
}
break;
default:
@@ -1704,7 +1706,7 @@
pPixelWeights->m_Weights[j - pPixelWeights->m_SrcStart];
dest_g += pixel_weight * src_scan[j];
}
- *dest_scan++ = (uint8_t)(dest_g >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
} break;
case 3: {
uint32_t dest_r = 0;
@@ -1719,8 +1721,10 @@
dest_g += pixel_weight * FXARGB_G(argb);
dest_b += pixel_weight * FXARGB_B(argb);
}
- *dest_scan++ =
- (uint8_t)FXRGB2GRAY((dest_r >> 16), (dest_g >> 16), (dest_b >> 16));
+ *dest_scan++ = static_cast<uint8_t>(
+ FXRGB2GRAY(CStretchEngine::PixelFromFixed(dest_r),
+ CStretchEngine::PixelFromFixed(dest_g),
+ CStretchEngine::PixelFromFixed(dest_b)));
} break;
case 4: {
uint32_t dest_b = 0;
@@ -1735,8 +1739,10 @@
dest_g += pixel_weight * (*src_pixel++);
dest_r += pixel_weight * (*src_pixel);
}
- *dest_scan++ =
- (uint8_t)FXRGB2GRAY((dest_r >> 16), (dest_g >> 16), (dest_b >> 16));
+ *dest_scan++ = static_cast<uint8_t>(
+ FXRGB2GRAY(CStretchEngine::PixelFromFixed(dest_r),
+ CStretchEngine::PixelFromFixed(dest_g),
+ CStretchEngine::PixelFromFixed(dest_b)));
} break;
case 5: {
uint32_t dest_b = 0;
@@ -1757,8 +1763,10 @@
dest_g += pixel_weight * src_g;
dest_r += pixel_weight * src_r;
}
- *dest_scan++ =
- (uint8_t)FXRGB2GRAY((dest_r >> 16), (dest_g >> 16), (dest_b >> 16));
+ *dest_scan++ = static_cast<uint8_t>(
+ FXRGB2GRAY(CStretchEngine::PixelFromFixed(dest_r),
+ CStretchEngine::PixelFromFixed(dest_g),
+ CStretchEngine::PixelFromFixed(dest_b)));
} break;
case 6:
return;
@@ -1770,7 +1778,7 @@
pPixelWeights->m_Weights[j - pPixelWeights->m_SrcStart];
dest_g += pixel_weight * src_scan[j];
}
- memset(dest_scan, (uint8_t)(dest_g >> 16), 3);
+ memset(dest_scan, CStretchEngine::PixelFromFixed(dest_g), 3);
dest_scan += dest_bytes_per_pixel;
} break;
case 8: {
@@ -1786,9 +1794,9 @@
dest_g += pixel_weight * FXARGB_G(argb);
dest_b += pixel_weight * FXARGB_B(argb);
}
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
dest_scan += dest_bytes_per_pixel - 3;
} break;
case 12: {
@@ -1806,9 +1814,9 @@
dest_g += pixel_weight * FXARGB_G(argb);
dest_b += pixel_weight * FXARGB_B(argb);
}
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
*dest_scan++ = 0xFF;
break;
}
@@ -1827,10 +1835,10 @@
dest_g += pixel_weight * FXARGB_G(argb);
dest_b += pixel_weight * FXARGB_B(argb);
}
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
- *dest_scan++ = (uint8_t)((dest_a) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_a);
} break;
case 9: {
uint32_t dest_b = 0;
@@ -1845,9 +1853,9 @@
dest_g += pixel_weight * (*src_pixel++);
dest_r += pixel_weight * (*src_pixel);
}
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
dest_scan += dest_bytes_per_pixel - 3;
} break;
case 10: {
@@ -1869,9 +1877,9 @@
dest_g += pixel_weight * src_g;
dest_r += pixel_weight * src_r;
}
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
dest_scan += dest_bytes_per_pixel - 3;
} break;
case 11: {
@@ -1890,10 +1898,10 @@
dest_r += pixel_weight * (*src_pixel);
dest_alpha += pixel_weight;
}
- *dest_scan++ = (uint8_t)((dest_b) >> 16);
- *dest_scan++ = (uint8_t)((dest_g) >> 16);
- *dest_scan++ = (uint8_t)((dest_r) >> 16);
- *dest_scan++ = (uint8_t)((dest_alpha * 255) >> 16);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_b);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_g);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_r);
+ *dest_scan++ = CStretchEngine::PixelFromFixed(dest_alpha * 255);
} break;
default:
return;
@@ -1948,7 +1956,7 @@
uint32_t dest_g = 0;
dest_g += pWeight->m_Weights[0] * (*scan_src1++);
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
- *scan_des++ = (uint8_t)(dest_g >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
}
break;
case FXDIB_Format::kRgb:
@@ -1962,9 +1970,9 @@
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
dest_r += pWeight->m_Weights[1] * (*scan_src2++);
scan_src2 += dest_Bpp - 3;
- *scan_des++ = (uint8_t)((dest_b) >> 16);
- *scan_des++ = (uint8_t)((dest_g) >> 16);
- *scan_des++ = (uint8_t)((dest_r) >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_b);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_r);
scan_des += dest_Bpp - 3;
}
break;
@@ -1978,10 +1986,10 @@
dest_g += pWeight->m_Weights[1] * (*scan_src2++);
dest_r += pWeight->m_Weights[1] * (*scan_src2++);
dest_a += pWeight->m_Weights[1] * (*scan_src2++);
- *scan_des++ = (uint8_t)((dest_b) >> 16);
- *scan_des++ = (uint8_t)((dest_g) >> 16);
- *scan_des++ = (uint8_t)((dest_r) >> 16);
- *scan_des++ = (uint8_t)((dest_a) >> 16);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_b);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_g);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_r);
+ *scan_des++ = CStretchEngine::PixelFromFixed(dest_a);
}
break;
default:
diff --git a/core/fxge/dib/cstretchengine.cpp b/core/fxge/dib/cstretchengine.cpp
index 537acd3..69cb8db 100644
--- a/core/fxge/dib/cstretchengine.cpp
+++ b/core/fxge/dib/cstretchengine.cpp
@@ -11,6 +11,7 @@
#include <utility>
#include "core/fxcrt/fx_safe_types.h"
+#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/pauseindicator_iface.h"
#include "core/fxge/dib/cfx_dibbase.h"
#include "core/fxge/dib/cfx_dibitmap.h"
@@ -25,17 +26,6 @@
namespace {
-constexpr uint32_t kFixedPointBits = 16;
-constexpr uint32_t kFixedPointOne = 1 << kFixedPointBits;
-
-inline uint32_t FixedFromFloat(float f) {
- return static_cast<uint32_t>(FXSYS_roundf(f * kFixedPointOne));
-}
-
-inline uint8_t PixelFromFixed(uint32_t fixed) {
- return static_cast<uint8_t>(fixed >> kFixedPointBits);
-}
-
int GetPitchRoundUpTo4Bytes(int bits_per_pixel) {
return (bits_per_pixel + 31) / 32 * 4;
}
diff --git a/core/fxge/dib/cstretchengine.h b/core/fxge/dib/cstretchengine.h
index 8d047eb..5ebebb4 100644
--- a/core/fxge/dib/cstretchengine.h
+++ b/core/fxge/dib/cstretchengine.h
@@ -23,6 +23,17 @@
class CStretchEngine {
public:
+ static constexpr uint32_t kFixedPointBits = 16;
+ static constexpr uint32_t kFixedPointOne = 1 << kFixedPointBits;
+
+ static inline uint32_t FixedFromFloat(float f) {
+ return static_cast<uint32_t>(FXSYS_roundf(f * kFixedPointOne));
+ }
+
+ static inline uint8_t PixelFromFixed(uint32_t fixed) {
+ return static_cast<uint8_t>(fixed >> kFixedPointBits);
+ }
+
struct PixelWeight {
static size_t TotalBytesForWeightCount(size_t weight_count);
diff --git a/core/fxge/dib/cstretchengine_unittest.cpp b/core/fxge/dib/cstretchengine_unittest.cpp
index fec9eb0..202db9f 100644
--- a/core/fxge/dib/cstretchengine_unittest.cpp
+++ b/core/fxge/dib/cstretchengine_unittest.cpp
@@ -18,8 +18,8 @@
uint32_t PixelWeightSum(const CStretchEngine::PixelWeight* weights) {
uint32_t sum = 0;
- for (int j = weights->m_SrcStart; j <= weights->m_SrcEnd; ++j) {
- sum += weights->GetWeightForPosition(j);
+ for (int i = weights->m_SrcStart; i <= weights->m_SrcEnd; ++i) {
+ sum += weights->GetWeightForPosition(i);
}
return sum;
}
@@ -27,7 +27,7 @@
void ExecuteOneStretchTest(uint32_t dest_width,
uint32_t src_width,
const FXDIB_ResampleOptions& options) {
- constexpr uint32_t kExpectedSum = 65536; // kFixedPointOne not exposed yet.
+ constexpr uint32_t kExpectedSum = CStretchEngine::kFixedPointOne;
CStretchEngine::WeightTable table;
table.CalculateWeights(dest_width, 0, dest_width, src_width, 0, src_width,
options);
