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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/Log.h>
#include <ui/GraphicBuffer.h>
#include "LayerDim.h"
#include "SurfaceFlinger.h"
#include "DisplayHardware/DisplayHardware.h"
namespace android {
// ---------------------------------------------------------------------------
LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
const sp<Client>& client)
: LayerBaseClient(flinger, display, client)
{
}
LayerDim::~LayerDim()
{
}
void LayerDim::onDraw(const Region& clip) const
{
const State& s(drawingState());
Region::const_iterator it = clip.begin();
Region::const_iterator const end = clip.end();
if (s.alpha>0 && (it != end)) {
const DisplayHardware& hw(graphicPlane(0).displayHardware());
const GLfloat alpha = s.alpha/255.0f;
const uint32_t fbHeight = hw.getHeight();
glDisable(GL_TEXTURE_EXTERNAL_OES);
glDisable(GL_TEXTURE_2D);
if (s.alpha == 0xFF) {
glDisable(GL_BLEND);
} else {
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
glColor4f(0, 0, 0, alpha);
glVertexPointer(2, GL_FLOAT, 0, mVertices);
while (it != end) {
const Rect& r = *it++;
const GLint sy = fbHeight - (r.top + r.height());
glScissor(r.left, sy, r.width(), r.height());
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
glDisable(GL_BLEND);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
}
// ---------------------------------------------------------------------------
}; // namespace android
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