Moving the GL implementation details into a sub folder for client display.

remoting/client/gl_cursor_feedback_texture.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "remoting/client/gl_cursor_feedback_texture.h"
-
-#include "remoting/client/gl_render_layer.h"
-
-namespace remoting {
-
-namespace {
-
-const int kColorRingsCount = 5;
-const int kFeedbackTexturePixelDiameter = 512;
-const int kFeedbackTexturePixelRadius = kFeedbackTexturePixelDiameter / 2;
-
-// RGBA8888 colors. From inside to outside.
-const uint8_t kFeedbackRingColors[kColorRingsCount]
-                                 [GlRenderLayer::kBytesPerPixel] = {
-                                     {0x0, 0x0, 0x0, 0x7f},  // Black
-                                     {0x0, 0x0, 0x0, 0x7f},  // Black
-                                     {0xff, 0xff, 0xff, 0x7f},  // White
-                                     {0xff, 0xff, 0xff, 0x7f},  // White
-                                     {0xff, 0xff, 0xff, 0}  // Transparent White
-};
-
-const float kFeedbackRadiusStops[kColorRingsCount] =
-    {0.0f, 0.85f, 0.9f, 0.95f, 1.0f};
-
-uint32_t GetColorByRadius(float radius) {
-  int ring_index = kColorRingsCount - 1;
-  // Find first radius stop that is not smaller than current radius.
-  while (radius < kFeedbackRadiusStops[ring_index] && ring_index >= 0) {
-    ring_index--;
-  }
-
-  if (ring_index < 0) {
-    NOTREACHED();
-    return 0;
-  }
-
-  if (ring_index == kColorRingsCount - 1) {
-    // Area outside the circle. Just use the outermost color.
-    return *reinterpret_cast<const uint32_t*>(kFeedbackRingColors[ring_index]);
-  }
-
-  const uint8_t* first_color = kFeedbackRingColors[ring_index];
-  const uint8_t* second_color = kFeedbackRingColors[ring_index + 1];
-  float first_radius = kFeedbackRadiusStops[ring_index];
-  float second_radius = kFeedbackRadiusStops[ring_index + 1];
-
-  uint8_t progress =
-      (radius - first_radius) * 256 / (second_radius - first_radius);
-  uint32_t color;
-  uint8_t* color_ptr = reinterpret_cast<uint8_t*>(&color);
-  for (int i = 0; i < GlRenderLayer::kBytesPerPixel; i++) {
-    color_ptr[i] =
-        (first_color[i] * (256 - progress) + second_color[i] * progress) / 256;
-  }
-  return color;
-}
-
-void FillFeedbackTexture(uint32_t* texture) {
-  for (int x = 0; x < kFeedbackTexturePixelRadius; x++) {
-    for (int y = 0; y <= x; y++) {
-      float radius = sqrt(x * x + y * y) / kFeedbackTexturePixelRadius;
-      uint32_t color = GetColorByRadius(radius);
-
-      int x1 = kFeedbackTexturePixelRadius + x;
-      int x2 = kFeedbackTexturePixelRadius - 1 - x;
-
-      int y1 = kFeedbackTexturePixelRadius + y;
-      int y2 = kFeedbackTexturePixelRadius - 1 - y;
-
-      texture[x1 + y1 * kFeedbackTexturePixelDiameter] = color;
-      texture[x1 + y2 * kFeedbackTexturePixelDiameter] = color;
-      texture[x2 + y1 * kFeedbackTexturePixelDiameter] = color;
-      texture[x2 + y2 * kFeedbackTexturePixelDiameter] = color;
-      texture[y1 + x1 * kFeedbackTexturePixelDiameter] = color;
-      texture[y1 + x2 * kFeedbackTexturePixelDiameter] = color;
-      texture[y2 + x1 * kFeedbackTexturePixelDiameter] = color;
-      texture[y2 + x2 * kFeedbackTexturePixelDiameter] = color;
-    }
-  }
-}
-
-}  // namespace
-
-// static
-const int GlCursorFeedbackTexture::kTextureWidth =
-    kFeedbackTexturePixelDiameter;
-
-GlCursorFeedbackTexture* GlCursorFeedbackTexture::GetInstance() {
-  return base::Singleton<GlCursorFeedbackTexture>::get();
-}
-
-const std::vector<uint8_t>& GlCursorFeedbackTexture::GetTexture() const {
-  return texture_;
-}
-
-GlCursorFeedbackTexture::GlCursorFeedbackTexture() {
-  texture_.resize(kTextureWidth * kTextureWidth *
-                  GlRenderLayer::kBytesPerPixel);
-  FillFeedbackTexture(reinterpret_cast<uint32_t*>(texture_.data()));
-}
-
-GlCursorFeedbackTexture::~GlCursorFeedbackTexture() {}
-
-}  // namespace remoting