Move QtPlatformCompositorSupport into QtOpenGL

Task-number: QTBUG-83255
Change-Id: Id9ea654db8efb00b487d53aea03d7f23a7ab1a54
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 0 insertions, 455 deletions

diff --git a/src/platformsupport/platformcompositor/qplatformbackingstoreopenglsupport.cpp b/src/platformsupport/platformcompositor/qplatformbackingstoreopenglsupport.cpp
deleted file mode 100644
index 511d85a400..0000000000
--- a/src/platformsupport/platformcompositor/qplatformbackingstoreopenglsupport.cpp
+++ /dev/null
@@ -1,455 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2020 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtGui module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QT_NO_OPENGL
-
-#include "qplatformbackingstoreopenglsupport.h"
-
-#include <QtGui/private/qwindow_p.h>
-
-#include <qpa/qplatformgraphicsbuffer.h>
-#include <qpa/qplatformgraphicsbufferhelper.h>
-
-#include <QtOpenGL/QOpenGLTextureBlitter>
-#include <QtGui/qopengl.h>
-#include <QtGui/QOpenGLFunctions>
-#include <QtGui/QOpenGLContext>
-#include <QtGui/QOffscreenSurface>
-
-#ifndef GL_TEXTURE_BASE_LEVEL
-#define GL_TEXTURE_BASE_LEVEL             0x813C
-#endif
-#ifndef GL_TEXTURE_MAX_LEVEL
-#define GL_TEXTURE_MAX_LEVEL              0x813D
-#endif
-#ifndef GL_UNPACK_ROW_LENGTH
-#define GL_UNPACK_ROW_LENGTH              0x0CF2
-#endif
-#ifndef GL_RGB10_A2
-#define GL_RGB10_A2                       0x8059
-#endif
-#ifndef GL_UNSIGNED_INT_2_10_10_10_REV
-#define GL_UNSIGNED_INT_2_10_10_10_REV    0x8368
-#endif
-
-#ifndef GL_FRAMEBUFFER_SRGB
-#define GL_FRAMEBUFFER_SRGB 0x8DB9
-#endif
-#ifndef GL_FRAMEBUFFER_SRGB_CAPABLE
-#define GL_FRAMEBUFFER_SRGB_CAPABLE 0x8DBA
-#endif
-
-QT_BEGIN_NAMESPACE
-
-static inline QRect deviceRect(const QRect &rect, QWindow *window)
-{
-    QRect deviceRect(rect.topLeft() * window->devicePixelRatio(),
-                     rect.size() * window->devicePixelRatio());
-    return deviceRect;
-}
-
-static inline QPoint deviceOffset(const QPoint &pt, QWindow *window)
-{
-    return pt * window->devicePixelRatio();
-}
-
-static QRegion deviceRegion(const QRegion &region, QWindow *window, const QPoint &offset)
-{
-    if (offset.isNull() && window->devicePixelRatio() <= 1)
-        return region;
-
-    QVector<QRect> rects;
-    rects.reserve(region.rectCount());
-    for (const QRect &rect : region)
-        rects.append(deviceRect(rect.translated(offset), window));
-
-    QRegion deviceRegion;
-    deviceRegion.setRects(rects.constData(), rects.count());
-    return deviceRegion;
-}
-
-static inline QRect toBottomLeftRect(const QRect &topLeftRect, int windowHeight)
-{
-    return QRect(topLeftRect.x(), windowHeight - topLeftRect.bottomRight().y() - 1,
-                 topLeftRect.width(), topLeftRect.height());
-}
-
-static void blitTextureForWidget(const QPlatformTextureList *textures, int idx, QWindow *window, const QRect &deviceWindowRect,
-                                 QOpenGLTextureBlitter *blitter, const QPoint &offset, bool canUseSrgb)
-{
-    const QRect clipRect = textures->clipRect(idx);
-    if (clipRect.isEmpty())
-        return;
-
-    QRect rectInWindow = textures->geometry(idx);
-    // relative to the TLW, not necessarily our window (if the flush is for a native child widget), have to adjust
-    rectInWindow.translate(-offset);
-
-    const QRect clippedRectInWindow = rectInWindow & clipRect.translated(rectInWindow.topLeft());
-    const QRect srcRect = toBottomLeftRect(clipRect, rectInWindow.height());
-
-    const QMatrix4x4 target = QOpenGLTextureBlitter::targetTransform(deviceRect(clippedRectInWindow, window),
-                                                                     deviceWindowRect);
-
-    const QMatrix3x3 source = QOpenGLTextureBlitter::sourceTransform(deviceRect(srcRect, window),
-                                                                     deviceRect(rectInWindow, window).size(),
-                                                                     QOpenGLTextureBlitter::OriginBottomLeft);
-
-    QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
-    const bool srgb = textures->flags(idx).testFlag(QPlatformTextureList::TextureIsSrgb);
-    if (srgb && canUseSrgb)
-        funcs->glEnable(GL_FRAMEBUFFER_SRGB);
-
-    blitter->blit(textures->textureId(idx), target, source);
-
-    if (srgb && canUseSrgb)
-        funcs->glDisable(GL_FRAMEBUFFER_SRGB);
-}
-
-QPlatformBackingStoreOpenGLSupport::~QPlatformBackingStoreOpenGLSupport() {
-    if (context) {
-        QOffscreenSurface offscreenSurface;
-        offscreenSurface.setFormat(context->format());
-        offscreenSurface.create();
-        context->makeCurrent(&offscreenSurface);
-        if (textureId)
-            context->functions()->glDeleteTextures(1, &textureId);
-        if (blitter)
-            blitter->destroy();
-    }
-    delete blitter;
-}
-
-void QPlatformBackingStoreOpenGLSupport::composeAndFlush(QWindow *window, const QRegion &region, const QPoint &offset, QPlatformTextureList *textures, bool translucentBackground)
-{
-    if (!qt_window_private(window)->receivedExpose)
-        return;
-
-    if (!context) {
-        context.reset(new QOpenGLContext);
-        context->setFormat(window->requestedFormat());
-        context->setScreen(window->screen());
-        context->setShareContext(qt_window_private(window)->shareContext());
-        if (!context->create()) {
-            qCWarning(lcQpaBackingStore, "composeAndFlush: QOpenGLContext creation failed");
-            return;
-        }
-    }
-
-    bool current = context->makeCurrent(window);
-
-    if (!current && context->isValid()) {
-        delete blitter;
-        blitter = nullptr;
-        textureId = 0;
-        current = context->create() && context->makeCurrent(window);
-    }
-
-    if (!current) {
-        qCWarning(lcQpaBackingStore, "composeAndFlush: makeCurrent() failed");
-        return;
-    }
-
-    qCDebug(lcQpaBackingStore) << "Composing and flushing" << region << "of" << window
-        << "at offset" << offset << "with" << textures->count() << "texture(s) in" << textures;
-
-    QWindowPrivate::get(window)->lastComposeTime.start();
-
-    QOpenGLFunctions *funcs = context->functions();
-    funcs->glViewport(0, 0, qRound(window->width() * window->devicePixelRatio()), qRound(window->height() * window->devicePixelRatio()));
-    funcs->glClearColor(0, 0, 0, translucentBackground ? 0 : 1);
-    funcs->glClear(GL_COLOR_BUFFER_BIT);
-
-    if (!blitter) {
-        blitter = new QOpenGLTextureBlitter;
-        blitter->create();
-    }
-
-    blitter->bind();
-
-    const QRect deviceWindowRect = deviceRect(QRect(QPoint(), window->size()), window);
-    const QPoint deviceWindowOffset = deviceOffset(offset, window);
-
-    bool canUseSrgb = false;
-    // If there are any sRGB textures in the list, check if the destination
-    // framebuffer is sRGB capable.
-    for (int i = 0; i < textures->count(); ++i) {
-        if (textures->flags(i).testFlag(QPlatformTextureList::TextureIsSrgb)) {
-            GLint cap = 0;
-            funcs->glGetIntegerv(GL_FRAMEBUFFER_SRGB_CAPABLE, &cap);
-            if (cap)
-                canUseSrgb = true;
-            break;
-        }
-    }
-
-    // Textures for renderToTexture widgets.
-    for (int i = 0; i < textures->count(); ++i) {
-        if (!textures->flags(i).testFlag(QPlatformTextureList::StacksOnTop))
-            blitTextureForWidget(textures, i, window, deviceWindowRect, blitter, offset, canUseSrgb);
-    }
-
-    // Backingstore texture with the normal widgets.
-    GLuint textureId = 0;
-    QOpenGLTextureBlitter::Origin origin = QOpenGLTextureBlitter::OriginTopLeft;
-    if (QPlatformGraphicsBuffer *graphicsBuffer = backingStore->graphicsBuffer()) {
-        if (graphicsBuffer->size() != textureSize) {
-            if (this->textureId)
-                funcs->glDeleteTextures(1, &this->textureId);
-            funcs->glGenTextures(1, &this->textureId);
-            funcs->glBindTexture(GL_TEXTURE_2D, this->textureId);
-            QOpenGLContext *ctx = QOpenGLContext::currentContext();
-            if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
-                funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
-                funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
-            }
-            funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-            funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-            funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-            funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-
-            if (QPlatformGraphicsBufferHelper::lockAndBindToTexture(graphicsBuffer, &needsSwizzle, &premultiplied)) {
-                textureSize = graphicsBuffer->size();
-            } else {
-                textureSize = QSize(0,0);
-            }
-
-            graphicsBuffer->unlock();
-        } else if (!region.isEmpty()){
-            funcs->glBindTexture(GL_TEXTURE_2D, this->textureId);
-            QPlatformGraphicsBufferHelper::lockAndBindToTexture(graphicsBuffer, &needsSwizzle, &premultiplied);
-            graphicsBuffer->unlock();
-        }
-
-        if (graphicsBuffer->origin() == QPlatformGraphicsBuffer::OriginBottomLeft)
-            origin = QOpenGLTextureBlitter::OriginBottomLeft;
-        textureId = this->textureId;
-    } else {
-        QPlatformBackingStore::TextureFlags flags;
-        textureId = backingStore->toTexture(deviceRegion(region, window, offset), &textureSize, &flags);
-        needsSwizzle = (flags & QPlatformBackingStore::TextureSwizzle) != 0;
-        premultiplied = (flags & QPlatformBackingStore::TexturePremultiplied) != 0;
-        if (flags & QPlatformBackingStore::TextureFlip)
-            origin = QOpenGLTextureBlitter::OriginBottomLeft;
-    }
-
-    funcs->glEnable(GL_BLEND);
-    if (premultiplied)
-        funcs->glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
-    else
-        funcs->glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
-
-    if (textureId) {
-        if (needsSwizzle)
-            blitter->setRedBlueSwizzle(true);
-        // The backingstore is for the entire tlw.
-        // In case of native children offset tells the position relative to the tlw.
-        const QRect srcRect = toBottomLeftRect(deviceWindowRect.translated(deviceWindowOffset), textureSize.height());
-        const QMatrix3x3 source = QOpenGLTextureBlitter::sourceTransform(srcRect,
-                                                                         textureSize,
-                                                                         origin);
-        blitter->blit(textureId, QMatrix4x4(), source);
-        if (needsSwizzle)
-            blitter->setRedBlueSwizzle(false);
-    }
-
-    // Textures for renderToTexture widgets that have WA_AlwaysStackOnTop set.
-    bool blendIsPremultiplied = premultiplied;
-    for (int i = 0; i < textures->count(); ++i) {
-        const QPlatformTextureList::Flags flags = textures->flags(i);
-        if (flags.testFlag(QPlatformTextureList::NeedsPremultipliedAlphaBlending)) {
-            if (!blendIsPremultiplied) {
-                funcs->glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
-                blendIsPremultiplied = true;
-            }
-        } else {
-            if (blendIsPremultiplied) {
-                funcs->glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
-                blendIsPremultiplied = false;
-            }
-        }
-        if (flags.testFlag(QPlatformTextureList::StacksOnTop))
-            blitTextureForWidget(textures, i, window, deviceWindowRect, blitter, offset, canUseSrgb);
-    }
-
-    funcs->glDisable(GL_BLEND);
-    blitter->release();
-
-    context->swapBuffers(window);
-}
-
-GLuint QPlatformBackingStoreOpenGLSupport::toTexture(const QRegion &dirtyRegion, QSize *textureSize, QPlatformBackingStore::TextureFlags *flags) const
-{
-    Q_ASSERT(textureSize);
-    Q_ASSERT(flags);
-
-    QImage image = backingStore->toImage();
-    QSize imageSize = image.size();
-
-    QOpenGLContext *ctx = QOpenGLContext::currentContext();
-    GLenum internalFormat = GL_RGBA;
-    GLuint pixelType = GL_UNSIGNED_BYTE;
-
-    bool needsConversion = false;
-    *flags = { };
-    switch (image.format()) {
-    case QImage::Format_ARGB32_Premultiplied:
-        *flags |= QPlatformBackingStore::TexturePremultiplied;
-        Q_FALLTHROUGH();
-    case QImage::Format_RGB32:
-    case QImage::Format_ARGB32:
-        *flags |= QPlatformBackingStore::TextureSwizzle;
-        break;
-    case QImage::Format_RGBA8888_Premultiplied:
-        *flags |= QPlatformBackingStore::TexturePremultiplied;
-        Q_FALLTHROUGH();
-    case QImage::Format_RGBX8888:
-    case QImage::Format_RGBA8888:
-        break;
-    case QImage::Format_BGR30:
-    case QImage::Format_A2BGR30_Premultiplied:
-        if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
-            pixelType = GL_UNSIGNED_INT_2_10_10_10_REV;
-            internalFormat = GL_RGB10_A2;
-            *flags |= QPlatformBackingStore::TexturePremultiplied;
-        } else {
-            needsConversion = true;
-        }
-        break;
-    case QImage::Format_RGB30:
-    case QImage::Format_A2RGB30_Premultiplied:
-        if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
-            pixelType = GL_UNSIGNED_INT_2_10_10_10_REV;
-            internalFormat = GL_RGB10_A2;
-            *flags |= QPlatformBackingStore::TextureSwizzle | QPlatformBackingStore::TexturePremultiplied;
-        } else {
-            needsConversion = true;
-        }
-        break;
-    default:
-        needsConversion = true;
-        break;
-    }
-    if (imageSize.isEmpty()) {
-        *textureSize = imageSize;
-        return 0;
-    }
-
-    // Must rely on the input only, not d_ptr.
-    // With the default composeAndFlush() textureSize is &d_ptr->textureSize.
-    bool resized = *textureSize != imageSize;
-    if (dirtyRegion.isEmpty() && !resized)
-        return textureId;
-
-    *textureSize = imageSize;
-
-    if (needsConversion)
-        image = image.convertToFormat(QImage::Format_RGBA8888);
-
-    // The image provided by the backingstore may have a stride larger than width * 4, for
-    // instance on platforms that manually implement client-side decorations.
-    static const int bytesPerPixel = 4;
-    const qsizetype strideInPixels = image.bytesPerLine() / bytesPerPixel;
-    const bool hasUnpackRowLength = !ctx->isOpenGLES() || ctx->format().majorVersion() >= 3;
-
-    QOpenGLFunctions *funcs = ctx->functions();
-
-    if (hasUnpackRowLength) {
-        funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, strideInPixels);
-    } else if (strideInPixels != image.width()) {
-        // No UNPACK_ROW_LENGTH on ES 2.0 and yet we would need it. This case is typically
-        // hit with QtWayland which is rarely used in combination with a ES2.0-only GL
-        // implementation.  Therefore, accept the performance hit and do a copy.
-        image = image.copy();
-    }
-
-    if (resized) {
-        if (textureId)
-            funcs->glDeleteTextures(1, &textureId);
-        funcs->glGenTextures(1, &textureId);
-        funcs->glBindTexture(GL_TEXTURE_2D, textureId);
-        if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
-            funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
-            funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
-        }
-        funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-        funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-        funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-        funcs->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-
-        funcs->glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, imageSize.width(), imageSize.height(), 0, GL_RGBA, pixelType,
-                            const_cast<uchar*>(image.constBits()));
-    } else {
-        funcs->glBindTexture(GL_TEXTURE_2D, textureId);
-        QRect imageRect = image.rect();
-        QRect rect = dirtyRegion.boundingRect() & imageRect;
-
-        if (hasUnpackRowLength) {
-            funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,
-                                   image.constScanLine(rect.y()) + rect.x() * bytesPerPixel);
-        } else {
-            // if the rect is wide enough it's cheaper to just
-            // extend it instead of doing an image copy
-            if (rect.width() >= imageRect.width() / 2) {
-                rect.setX(0);
-                rect.setWidth(imageRect.width());
-            }
-
-            // if the sub-rect is full-width we can pass the image data directly to
-            // OpenGL instead of copying, since there's no gap between scanlines
-
-            if (rect.width() == imageRect.width()) {
-                funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,
-                                       image.constScanLine(rect.y()));
-            } else {
-                funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,
-                                       image.copy(rect).constBits());
-            }
-        }
-    }
-
-    if (hasUnpackRowLength)
-        funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
-
-    return textureId;
-}
-
-#endif // QT_NO_OPENGL
-
-QT_END_NAMESPACE