Revert of ui: Add GLImage unit test framework.

ui/gl/test/gl_test_helper.cc

-// Copyright 2015 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 "ui/gl/test/gl_test_helper.h"
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace gfx {
-
-// static
-GLuint GLTestHelper::CreateTexture(GLenum target) {
-  // Create the texture object.
-  GLuint texture = 0;
-  glGenTextures(1, &texture);
-  glBindTexture(target, texture);
-  glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  return texture;
-}
-
-// static
-GLuint GLTestHelper::CompileShader(GLenum type, const char* src) {
-  GLuint shader = glCreateShader(type);
-  // Load the shader source.
-  glShaderSource(shader, 1, &src, nullptr);
-  // Compile the shader.
-  glCompileShader(shader);
-  return shader;
-}
-
-// static
-GLuint GLTestHelper::LoadShader(GLenum type, const char* src) {
-  GLuint shader = CompileShader(type, src);
-
-  // Check the compile status.
-  GLint value = 0;
-  glGetShaderiv(shader, GL_COMPILE_STATUS, &value);
-  if (!value) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetShaderInfoLog(shader, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    EXPECT_EQ(1, value) << "Error compiling shader: " << log;
-    glDeleteShader(shader);
-    shader = 0;
-  }
-  return shader;
-}
-
-// static
-GLuint GLTestHelper::LinkProgram(GLuint vertex_shader, GLuint fragment_shader) {
-  // Create the program object.
-  GLuint program = glCreateProgram();
-  glAttachShader(program, vertex_shader);
-  glAttachShader(program, fragment_shader);
-  // Link the program.
-  glLinkProgram(program);
-  return program;
-}
-
-// static
-GLuint GLTestHelper::SetupProgram(GLuint vertex_shader,
-                                  GLuint fragment_shader) {
-  GLuint program = LinkProgram(vertex_shader, fragment_shader);
-  // Check the link status.
-  GLint linked = 0;
-  glGetProgramiv(program, GL_LINK_STATUS, &linked);
-  if (!linked) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetProgramInfoLog(program, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    EXPECT_EQ(1, linked) << "Error linking program: " << log;
-    glDeleteProgram(program);
-    program = 0;
-  }
-  return program;
-}
-
-// static
-GLuint GLTestHelper::SetupFramebuffer(int width, int height) {
-  GLuint color_buffer_texture = CreateTexture(GL_TEXTURE_2D);
-  glBindTexture(GL_TEXTURE_2D, color_buffer_texture);
-  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
-               GL_UNSIGNED_BYTE, nullptr);
-  GLuint framebuffer = 0;
-  glGenFramebuffersEXT(1, &framebuffer);
-  glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer);
-  glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
-                            color_buffer_texture, 0);
-  if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-    EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
-              glCheckFramebufferStatusEXT(GL_FRAMEBUFFER))
-        << "Error setting up framebuffer";
-    glDeleteFramebuffersEXT(1, &framebuffer);
-    framebuffer = 0;
-  }
-  glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
-  glDeleteTextures(1, &color_buffer_texture);
-  return framebuffer;
-}
-
-// static
-bool GLTestHelper::CheckPixels(int x,
-                               int y,
-                               int width,
-                               int height,
-                               const uint8_t expected_color[4]) {
-  int size = width * height * 4;
-  scoped_ptr<uint8_t[]> pixels(new uint8_t[size]);
-  const uint8_t kCheckClearValue = 123u;
-  memset(pixels.get(), kCheckClearValue, size);
-  glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels.get());
-  int bad_count = 0;
-  for (int yy = 0; yy < height; ++yy) {
-    for (int xx = 0; xx < width; ++xx) {
-      int offset = yy * width * 4 + xx * 4;
-      for (int jj = 0; jj < 4; ++jj) {
-        uint8_t actual = pixels[offset + jj];
-        uint8_t expected = expected_color[jj];
-        EXPECT_EQ(expected, actual) << " at " << (xx + x) << ", " << (yy + y)
-                                    << " channel " << jj;
-        bad_count += actual != expected;
-        // Exit early just so we don't spam the log but we print enough to
-        // hopefully make it easy to diagnose the issue.
-        if (bad_count > 16)
-          return false;
-      }
-    }
-  }
-
-  return !bad_count;
-}
-
-}  // namespace gfx