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/*
* Copyright (C) 2016 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 "GLFunctorDrawable.h"
#include <GrDirectContext.h>
#include <private/hwui/DrawGlInfo.h>
#include "FunctorDrawable.h"
#include "GrBackendSurface.h"
#include "RenderNode.h"
#include "SkAndroidFrameworkUtils.h"
#include "SkClipStack.h"
#include "SkRect.h"
#include "SkM44.h"
#include "utils/GLUtils.h"
namespace android {
namespace uirenderer {
namespace skiapipeline {
static void setScissor(int viewportHeight, const SkIRect& clip) {
SkASSERT(!clip.isEmpty());
// transform to Y-flipped GL space, and prevent negatives
GLint y = viewportHeight - clip.fBottom;
GLint height = (viewportHeight - clip.fTop) - y;
glScissor(clip.fLeft, y, clip.width(), height);
}
static void GetFboDetails(SkCanvas* canvas, GLuint* outFboID, SkISize* outFboSize) {
GrBackendRenderTarget renderTarget = canvas->topLayerBackendRenderTarget();
GrGLFramebufferInfo fboInfo;
LOG_ALWAYS_FATAL_IF(!renderTarget.getGLFramebufferInfo(&fboInfo),
"getGLFrameBufferInfo failed");
*outFboID = fboInfo.fFBOID;
*outFboSize = renderTarget.dimensions();
}
void GLFunctorDrawable::onDraw(SkCanvas* canvas) {
GrDirectContext* directContext = GrAsDirectContext(canvas->recordingContext());
if (directContext == nullptr) {
// We're dumping a picture, render a light-blue rectangle instead
// TODO: Draw the WebView text on top? Seemingly complicated as SkPaint doesn't
// seem to have a default typeface that works. We only ever use drawGlyphs, which
// requires going through minikin & hwui's canvas which we don't have here.
SkPaint paint;
paint.setColor(0xFF81D4FA);
canvas->drawRect(mBounds, paint);
return;
}
// canvas may be an AlphaFilterCanvas, which is intended to draw with a
// modified alpha. We do not have a way to do this without drawing into an
// extra layer, which would have a performance cost. Draw directly into the
// underlying gpu canvas. This matches prior behavior and the behavior in
// Vulkan.
{
auto* gpuCanvas = SkAndroidFrameworkUtils::getBaseWrappedCanvas(canvas);
LOG_ALWAYS_FATAL_IF(!gpuCanvas, "GLFunctorDrawable::onDraw is using an invalid canvas!");
canvas = gpuCanvas;
}
// flush will create a GrRenderTarget if not already present.
canvas->flush();
GLuint fboID = 0;
SkISize fboSize;
GetFboDetails(canvas, &fboID, &fboSize);
SkIRect surfaceBounds = canvas->topLayerBounds();
SkIRect clipBounds = canvas->getDeviceClipBounds();
SkM44 mat4(canvas->getLocalToDevice());
SkRegion clipRegion;
canvas->temporary_internal_getRgnClip(&clipRegion);
sk_sp<SkSurface> tmpSurface;
// we are in a state where there is an unclipped saveLayer
if (fboID != 0 && !surfaceBounds.contains(clipBounds)) {
// create an offscreen layer and clear it
SkImageInfo surfaceInfo =
canvas->imageInfo().makeWH(clipBounds.width(), clipBounds.height());
tmpSurface =
SkSurface::MakeRenderTarget(directContext, SkBudgeted::kYes, surfaceInfo);
tmpSurface->getCanvas()->clear(SK_ColorTRANSPARENT);
GrGLFramebufferInfo fboInfo;
if (!tmpSurface->getBackendRenderTarget(SkSurface::kFlushWrite_BackendHandleAccess)
.getGLFramebufferInfo(&fboInfo)) {
ALOGW("Unable to extract renderTarget info from offscreen canvas; aborting GLFunctor");
return;
}
fboSize = SkISize::Make(surfaceInfo.width(), surfaceInfo.height());
fboID = fboInfo.fFBOID;
// update the matrix and clip that we pass to the WebView to match the coordinates of
// the offscreen layer
mat4.preTranslate(-clipBounds.fLeft, -clipBounds.fTop);
clipBounds.offsetTo(0, 0);
clipRegion.translate(-surfaceBounds.fLeft, -surfaceBounds.fTop);
} else if (fboID != 0) {
// we are drawing into a (clipped) offscreen layer so we must update the clip and matrix
// from device coordinates to the layer's coordinates
clipBounds.offset(-surfaceBounds.fLeft, -surfaceBounds.fTop);
mat4.preTranslate(-surfaceBounds.fLeft, -surfaceBounds.fTop);
}
DrawGlInfo info;
info.clipLeft = clipBounds.fLeft;
info.clipTop = clipBounds.fTop;
info.clipRight = clipBounds.fRight;
info.clipBottom = clipBounds.fBottom;
info.isLayer = fboID != 0;
info.width = fboSize.width();
info.height = fboSize.height();
mat4.getColMajor(&info.transform[0]);
info.color_space_ptr = canvas->imageInfo().colorSpace();
// ensure that the framebuffer that the webview will render into is bound before we clear
// the stencil and/or draw the functor.
glViewport(0, 0, info.width, info.height);
glBindFramebuffer(GL_FRAMEBUFFER, fboID);
// apply a simple clip with a scissor or a complex clip with a stencil
bool clearStencilAfterFunctor = false;
if (CC_UNLIKELY(clipRegion.isComplex())) {
// clear the stencil
// TODO: move stencil clear and canvas flush to SkAndroidFrameworkUtils::clipWithStencil
glDisable(GL_SCISSOR_TEST);
glStencilMask(0x1);
glClearStencil(0);
glClear(GL_STENCIL_BUFFER_BIT);
// notify Skia that we just updated the FBO and stencil
const uint32_t grState = kStencil_GrGLBackendState | kRenderTarget_GrGLBackendState;
directContext->resetContext(grState);
SkCanvas* tmpCanvas = canvas;
if (tmpSurface) {
tmpCanvas = tmpSurface->getCanvas();
// set the clip on the new canvas
tmpCanvas->clipRegion(clipRegion);
}
// GL ops get inserted here if previous flush is missing, which could dirty the stencil
bool stencilWritten = SkAndroidFrameworkUtils::clipWithStencil(tmpCanvas);
tmpCanvas->flush(); // need this flush for the single op that draws into the stencil
// ensure that the framebuffer that the webview will render into is bound before after we
// draw into the stencil
glViewport(0, 0, info.width, info.height);
glBindFramebuffer(GL_FRAMEBUFFER, fboID);
if (stencilWritten) {
glStencilMask(0x1);
glStencilFunc(GL_EQUAL, 0x1, 0x1);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
clearStencilAfterFunctor = true;
glEnable(GL_STENCIL_TEST);
} else {
glDisable(GL_STENCIL_TEST);
}
} else if (clipRegion.isEmpty()) {
glDisable(GL_STENCIL_TEST);
glDisable(GL_SCISSOR_TEST);
} else {
glDisable(GL_STENCIL_TEST);
glEnable(GL_SCISSOR_TEST);
setScissor(info.height, clipRegion.getBounds());
}
// WebView may swallow GL errors, so catch them here
GL_CHECKPOINT(LOW);
mWebViewHandle->drawGl(info);
if (clearStencilAfterFunctor) {
// clear stencil buffer as it may be used by Skia
glDisable(GL_SCISSOR_TEST);
glDisable(GL_STENCIL_TEST);
glStencilMask(0x1);
glClearStencil(0);
glClear(GL_STENCIL_BUFFER_BIT);
}
directContext->resetContext();
// if there were unclipped save layers involved we draw our offscreen surface to the canvas
if (tmpSurface) {
SkAutoCanvasRestore acr(canvas, true);
SkMatrix invertedMatrix;
if (!canvas->getTotalMatrix().invert(&invertedMatrix)) {
ALOGW("Unable to extract invert canvas matrix; aborting GLFunctor draw");
return;
}
canvas->concat(invertedMatrix);
const SkIRect deviceBounds = canvas->getDeviceClipBounds();
tmpSurface->draw(canvas, deviceBounds.fLeft, deviceBounds.fTop);
}
}
} // namespace skiapipeline
} // namespace uirenderer
} // namespace android
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