Add m-esr52 at 52.6.0

1 files changed, 361 insertions, 0 deletions

diff --git a/gfx/src/nsColor.cpp b/gfx/src/nsColor.cpp
new file mode 100644
index 000000000..359f9fde4
--- /dev/null
+++ b/gfx/src/nsColor.cpp
@@ -0,0 +1,361 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "mozilla/ArrayUtils.h"         // for ArrayLength
+#include "mozilla/mozalloc.h"           // for operator delete, etc
+#include "mozilla/MathAlgorithms.h"
+
+#include "nsColor.h"
+#include <sys/types.h>                  // for int32_t
+#include "nsColorNames.h"               // for nsColorNames
+#include "nsDebug.h"                    // for NS_ASSERTION, etc
+#include "nsStaticNameTable.h"
+#include "nsString.h"                   // for nsAutoCString, nsString, etc
+#include "nscore.h"                     // for nsAString, etc
+
+using namespace mozilla;
+
+// define an array of all color names
+#define GFX_COLOR(_name, _value) #_name,
+static const char* const kColorNames[] = {
+#include "nsColorNameList.h"
+};
+#undef GFX_COLOR
+
+// define an array of all color name values
+#define GFX_COLOR(_name, _value) _value,
+static const nscolor kColors[] = {
+#include "nsColorNameList.h"
+};
+#undef GFX_COLOR
+
+#define eColorName_COUNT (ArrayLength(kColorNames))
+#define eColorName_UNKNOWN (-1)
+
+static nsStaticCaseInsensitiveNameTable* gColorTable = nullptr;
+
+void nsColorNames::AddRefTable(void) 
+{
+  NS_ASSERTION(!gColorTable, "pre existing array!");
+  if (!gColorTable) {
+    gColorTable =
+      new nsStaticCaseInsensitiveNameTable(kColorNames, eColorName_COUNT);
+  }
+}
+
+void nsColorNames::ReleaseTable(void)
+{
+  if (gColorTable) {
+    delete gColorTable;
+    gColorTable = nullptr;
+  }
+}
+
+static int ComponentValue(const char16_t* aColorSpec, int aLen, int color, int dpc)
+{
+  int component = 0;
+  int index = (color * dpc);
+  if (2 < dpc) {
+    dpc = 2;
+  }
+  while (--dpc >= 0) {
+    char16_t ch = ((index < aLen) ? aColorSpec[index++] : '0');
+    if (('0' <= ch) && (ch <= '9')) {
+      component = (component * 16) + (ch - '0');
+    } else if ((('a' <= ch) && (ch <= 'f')) || 
+               (('A' <= ch) && (ch <= 'F'))) {
+      // "ch&7" handles lower and uppercase hex alphabetics
+      component = (component * 16) + (ch & 7) + 9;
+    }
+    else {  // not a hex digit, treat it like 0
+      component = (component * 16);
+    }
+  }
+  return component;
+}
+
+bool
+NS_HexToRGBA(const nsAString& aColorSpec, nsHexColorType aType,
+             nscolor* aResult)
+{
+  const char16_t* buffer = aColorSpec.BeginReading();
+
+  int nameLen = aColorSpec.Length();
+  bool hasAlpha = false;
+  if (nameLen != 3 && nameLen != 6) {
+    if ((nameLen != 4 && nameLen != 8) || aType == nsHexColorType::NoAlpha) {
+      // Improperly formatted color value
+      return false;
+    }
+    hasAlpha = true;
+  }
+
+  // Make sure the digits are legal
+  for (int i = 0; i < nameLen; i++) {
+    char16_t ch = buffer[i];
+    if (((ch >= '0') && (ch <= '9')) ||
+        ((ch >= 'a') && (ch <= 'f')) ||
+        ((ch >= 'A') && (ch <= 'F'))) {
+      // Legal character
+      continue;
+    }
+    // Whoops. Illegal character.
+    return false;
+  }
+
+  // Convert the ascii to binary
+  int dpc = ((nameLen <= 4) ? 1 : 2);
+  // Translate components from hex to binary
+  int r = ComponentValue(buffer, nameLen, 0, dpc);
+  int g = ComponentValue(buffer, nameLen, 1, dpc);
+  int b = ComponentValue(buffer, nameLen, 2, dpc);
+  int a;
+  if (hasAlpha) {
+    a = ComponentValue(buffer, nameLen, 3, dpc);
+  } else {
+    a = (dpc == 1) ? 0xf : 0xff;
+  }
+  if (dpc == 1) {
+    // Scale single digit component to an 8 bit value. Replicate the
+    // single digit to compute the new value.
+    r = (r << 4) | r;
+    g = (g << 4) | g;
+    b = (b << 4) | b;
+    a = (a << 4) | a;
+  }
+  NS_ASSERTION((r >= 0) && (r <= 255), "bad r");
+  NS_ASSERTION((g >= 0) && (g <= 255), "bad g");
+  NS_ASSERTION((b >= 0) && (b <= 255), "bad b");
+  NS_ASSERTION((a >= 0) && (a <= 255), "bad a");
+  *aResult = NS_RGBA(r, g, b, a);
+  return true;
+}
+
+// This implements part of the algorithm for legacy behavior described in
+// http://www.whatwg.org/specs/web-apps/current-work/complete/common-microsyntaxes.html#rules-for-parsing-a-legacy-color-value
+bool NS_LooseHexToRGB(const nsString& aColorSpec, nscolor* aResult)
+{
+  if (aColorSpec.EqualsLiteral("transparent")) {
+    return false;
+  }
+
+  int nameLen = aColorSpec.Length();
+  const char16_t* colorSpec = aColorSpec.get();
+  if (nameLen > 128) {
+    nameLen = 128;
+  }
+
+  if ('#' == colorSpec[0]) {
+    ++colorSpec;
+    --nameLen;
+  }
+
+  // digits per component
+  int dpc = (nameLen + 2) / 3;
+  int newdpc = dpc;
+
+  // Use only the rightmost 8 characters of each component.
+  if (newdpc > 8) {
+    nameLen -= newdpc - 8;
+    colorSpec += newdpc - 8;
+    newdpc = 8;
+  }
+
+  // And then keep trimming characters at the left until we'd trim one
+  // that would leave a nonzero value, but not past 2 characters per
+  // component.
+  while (newdpc > 2) {
+    bool haveNonzero = false;
+    for (int c = 0; c < 3; ++c) {
+      MOZ_ASSERT(c * dpc < nameLen,
+                 "should not pass end of string while newdpc > 2");
+      char16_t ch = colorSpec[c * dpc];
+      if (('1' <= ch && ch <= '9') ||
+          ('A' <= ch && ch <= 'F') ||
+          ('a' <= ch && ch <= 'f')) {
+        haveNonzero = true;
+        break;
+      }
+    }
+    if (haveNonzero) {
+      break;
+    }
+    --newdpc;
+    --nameLen;
+    ++colorSpec;
+  }
+
+  // Translate components from hex to binary
+  int r = ComponentValue(colorSpec, nameLen, 0, dpc);
+  int g = ComponentValue(colorSpec, nameLen, 1, dpc);
+  int b = ComponentValue(colorSpec, nameLen, 2, dpc);
+  NS_ASSERTION((r >= 0) && (r <= 255), "bad r");
+  NS_ASSERTION((g >= 0) && (g <= 255), "bad g");
+  NS_ASSERTION((b >= 0) && (b <= 255), "bad b");
+
+  *aResult = NS_RGB(r, g, b);
+  return true;
+}
+
+bool NS_ColorNameToRGB(const nsAString& aColorName, nscolor* aResult)
+{
+  if (!gColorTable) return false;
+
+  int32_t id = gColorTable->Lookup(aColorName);
+  if (eColorName_UNKNOWN < id) {
+    NS_ASSERTION(uint32_t(id) < eColorName_COUNT,
+                 "gColorTable->Lookup messed up");
+    if (aResult) {
+      *aResult = kColors[id];
+    }
+    return true;
+  }
+  return false;
+}
+
+// Returns kColorNames, an array of all possible color names, and sets
+// *aSizeArray to the size of that array. Do NOT call free() on this array.
+const char * const * NS_AllColorNames(size_t *aSizeArray)
+{
+  *aSizeArray = ArrayLength(kColorNames);
+  return kColorNames;
+}
+
+// Macro to blend two colors
+//
+// equivalent to target = (bg*(255-fgalpha) + fg*fgalpha)/255
+#define MOZ_BLEND(target, bg, fg, fgalpha)       \
+  FAST_DIVIDE_BY_255(target, (bg)*(255-fgalpha) + (fg)*(fgalpha))
+
+nscolor
+NS_ComposeColors(nscolor aBG, nscolor aFG)
+{
+  // This function uses colors that are non premultiplied alpha.
+  int r, g, b, a;
+
+  int bgAlpha = NS_GET_A(aBG);
+  int fgAlpha = NS_GET_A(aFG);
+
+  // Compute the final alpha of the blended color
+  // a = fgAlpha + bgAlpha*(255 - fgAlpha)/255;
+  FAST_DIVIDE_BY_255(a, bgAlpha*(255-fgAlpha));
+  a = fgAlpha + a;
+  int blendAlpha;
+  if (a == 0) {
+    // In this case the blended color is totally trasparent,
+    // we preserve the color information of the foreground color.
+    blendAlpha = 255;
+  } else {
+    blendAlpha = (fgAlpha*255)/a;
+  }
+  MOZ_BLEND(r, NS_GET_R(aBG), NS_GET_R(aFG), blendAlpha);
+  MOZ_BLEND(g, NS_GET_G(aBG), NS_GET_G(aFG), blendAlpha);
+  MOZ_BLEND(b, NS_GET_B(aBG), NS_GET_B(aFG), blendAlpha);
+
+  return NS_RGBA(r, g, b, a);
+}
+
+namespace mozilla {
+
+static uint32_t
+BlendColorComponent(uint32_t aBg, uint32_t aFg, uint32_t aFgAlpha)
+{
+  return RoundingDivideBy255(aBg * (255 - aFgAlpha) + aFg * aFgAlpha);
+}
+
+nscolor
+LinearBlendColors(nscolor aBg, nscolor aFg, uint_fast8_t aFgRatio)
+{
+  // Common case that either pure background or pure foreground
+  if (aFgRatio == 0) {
+    return aBg;
+  }
+  if (aFgRatio == 255) {
+    return aFg;
+  }
+  // Common case that alpha channel is equal (usually both are opaque)
+  if (NS_GET_A(aBg) == NS_GET_A(aFg)) {
+    auto r = BlendColorComponent(NS_GET_R(aBg), NS_GET_R(aFg), aFgRatio);
+    auto g = BlendColorComponent(NS_GET_G(aBg), NS_GET_G(aFg), aFgRatio);
+    auto b = BlendColorComponent(NS_GET_B(aBg), NS_GET_B(aFg), aFgRatio);
+    return NS_RGBA(r, g, b, NS_GET_A(aFg));
+  }
+
+  constexpr float kFactor = 1.0f / 255.0f;
+
+  float p1 = kFactor * (255 - aFgRatio);
+  float a1 = kFactor * NS_GET_A(aBg);
+  float r1 = a1 * NS_GET_R(aBg);
+  float g1 = a1 * NS_GET_G(aBg);
+  float b1 = a1 * NS_GET_B(aBg);
+
+  float p2 = 1.0f - p1;
+  float a2 = kFactor * NS_GET_A(aFg);
+  float r2 = a2 * NS_GET_R(aFg);
+  float g2 = a2 * NS_GET_G(aFg);
+  float b2 = a2 * NS_GET_B(aFg);
+
+  float a = p1 * a1 + p2 * a2;
+  if (a == 0.0) {
+    return NS_RGBA(0, 0, 0, 0);
+  }
+
+  auto r = ClampColor((p1 * r1 + p2 * r2) / a);
+  auto g = ClampColor((p1 * g1 + p2 * g2) / a);
+  auto b = ClampColor((p1 * b1 + p2 * b2) / a);
+  return NS_RGBA(r, g, b, NSToIntRound(a * 255));
+}
+
+} // namespace mozilla
+
+// Functions to convert from HSL color space to RGB color space.
+// This is the algorithm described in the CSS3 specification
+
+// helper
+static float
+HSL_HueToRGB(float m1, float m2, float h)
+{
+  if (h < 0.0f)
+    h += 1.0f;
+  if (h > 1.0f)
+    h -= 1.0f;
+  if (h < (float)(1.0/6.0))
+    return m1 + (m2 - m1)*h*6.0f;
+  if (h < (float)(1.0/2.0))
+    return m2;
+  if (h < (float)(2.0/3.0))
+    return m1 + (m2 - m1)*((float)(2.0/3.0) - h)*6.0f;
+  return m1;      
+}
+
+// The float parameters are all expected to be in the range 0-1
+nscolor
+NS_HSL2RGB(float h, float s, float l)
+{
+  uint8_t r, g, b;
+  float m1, m2;
+  if (l <= 0.5f) {
+    m2 = l*(s+1);
+  } else {
+    m2 = l + s - l*s;
+  }
+  m1 = l*2 - m2;
+  r = uint8_t(255 * HSL_HueToRGB(m1, m2, h + 1.0f/3.0f));
+  g = uint8_t(255 * HSL_HueToRGB(m1, m2, h));
+  b = uint8_t(255 * HSL_HueToRGB(m1, m2, h - 1.0f/3.0f));
+  return NS_RGB(r, g, b);  
+}
+
+const char*
+NS_RGBToColorName(nscolor aColor)
+{
+  for (size_t idx = 0; idx < ArrayLength(kColors); ++idx) {
+    if (kColors[idx] == aColor) {
+      return kColorNames[idx];
+    }
+  }
+
+  return nullptr;
+}