From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 gfx/2d/ConvolutionFilter.cpp | 114 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 gfx/2d/ConvolutionFilter.cpp

(limited to 'gfx/2d/ConvolutionFilter.cpp')

diff --git a/gfx/2d/ConvolutionFilter.cpp b/gfx/2d/ConvolutionFilter.cpp
new file mode 100644
index 0000000000..31ace83dc7
--- /dev/null
+++ b/gfx/2d/ConvolutionFilter.cpp
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ConvolutionFilter.h"
+#include "HelpersSkia.h"
+#include "SkConvolver.h"
+#include "skia/include/core/SkBitmap.h"
+
+namespace mozilla::gfx {
+
+ConvolutionFilter::ConvolutionFilter()
+    : mFilter(MakeUnique<skia::SkConvolutionFilter1D>()) {}
+
+ConvolutionFilter::~ConvolutionFilter() = default;
+
+int32_t ConvolutionFilter::MaxFilter() const { return mFilter->maxFilter(); }
+
+int32_t ConvolutionFilter::NumValues() const { return mFilter->numValues(); }
+
+bool ConvolutionFilter::GetFilterOffsetAndLength(int32_t aRowIndex,
+                                                 int32_t* aResultOffset,
+                                                 int32_t* aResultLength) {
+  if (aRowIndex >= mFilter->numValues()) {
+    return false;
+  }
+  mFilter->FilterForValue(aRowIndex, aResultOffset, aResultLength);
+  return true;
+}
+
+void ConvolutionFilter::ConvolveHorizontally(const uint8_t* aSrc, uint8_t* aDst,
+                                             bool aHasAlpha) {
+  skia::convolve_horizontally(aSrc, *mFilter, aDst, aHasAlpha);
+}
+
+void ConvolutionFilter::ConvolveVertically(uint8_t* const* aSrc, uint8_t* aDst,
+                                           int32_t aRowIndex, int32_t aRowSize,
+                                           bool aHasAlpha) {
+  MOZ_ASSERT(aRowIndex < mFilter->numValues());
+
+  int32_t filterOffset;
+  int32_t filterLength;
+  auto filterValues =
+      mFilter->FilterForValue(aRowIndex, &filterOffset, &filterLength);
+  skia::convolve_vertically(filterValues, filterLength, aSrc, aRowSize, aDst,
+                            aHasAlpha);
+}
+
+bool ConvolutionFilter::ComputeResizeFilter(ResizeMethod aResizeMethod,
+                                            int32_t aSrcSize,
+                                            int32_t aDstSize) {
+  if (aSrcSize < 0 || aDstSize < 0) {
+    return false;
+  }
+
+  switch (aResizeMethod) {
+    case ResizeMethod::BOX:
+      return mFilter->ComputeFilterValues(skia::SkBoxFilter(), aSrcSize,
+                                          aDstSize);
+    case ResizeMethod::LANCZOS3:
+      return mFilter->ComputeFilterValues(skia::SkLanczosFilter(), aSrcSize,
+                                          aDstSize);
+    default:
+      return false;
+  }
+}
+
+bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight,
+           int32_t srcStride, uint8_t* dstData, int32_t dstWidth,
+           int32_t dstHeight, int32_t dstStride, SurfaceFormat format) {
+  if (!srcData || !dstData || srcWidth < 1 || srcHeight < 1 || dstWidth < 1 ||
+      dstHeight < 1) {
+    return false;
+  }
+
+  SkPixmap srcPixmap(MakeSkiaImageInfo(IntSize(srcWidth, srcHeight), format),
+                     srcData, srcStride);
+
+  // Rescaler is compatible with N32 only. Convert to N32 if needed.
+  SkBitmap tmpBitmap;
+  if (srcPixmap.colorType() != kN32_SkColorType) {
+    if (!tmpBitmap.tryAllocPixels(
+            SkImageInfo::MakeN32Premul(srcWidth, srcHeight)) ||
+        !tmpBitmap.writePixels(srcPixmap) ||
+        !tmpBitmap.peekPixels(&srcPixmap)) {
+      return false;
+    }
+  }
+
+  ConvolutionFilter xFilter;
+  ConvolutionFilter yFilter;
+  ConvolutionFilter* xOrYFilter = &xFilter;
+  bool isSquare = srcWidth == srcHeight && dstWidth == dstHeight;
+  if (!xFilter.ComputeResizeFilter(ConvolutionFilter::ResizeMethod::LANCZOS3,
+                                   srcWidth, dstWidth)) {
+    return false;
+  }
+  if (!isSquare) {
+    if (!yFilter.ComputeResizeFilter(ConvolutionFilter::ResizeMethod::LANCZOS3,
+                                     srcHeight, dstHeight)) {
+      return false;
+    }
+    xOrYFilter = &yFilter;
+  }
+
+  return skia::BGRAConvolve2D(
+      static_cast<const uint8_t*>(srcPixmap.addr()), int(srcPixmap.rowBytes()),
+      !srcPixmap.isOpaque(), xFilter.GetSkiaFilter(),
+      xOrYFilter->GetSkiaFilter(), int(dstStride), dstData);
+}
+
+}  // namespace mozilla::gfx
-- 
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