/*
 * Copyright (C) 2015 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 "TestUtils.h"

#include "hwui/Paint.h"
#include "DeferredLayerUpdater.h"

#include <renderthread/EglManager.h>
#include <renderthread/OpenGLPipeline.h>
#include <pipeline/skia/SkiaOpenGLPipeline.h>
#include <pipeline/skia/SkiaVulkanPipeline.h>
#include <renderthread/VulkanManager.h>
#include <utils/Unicode.h>
#include <SkClipStack.h>

#include <SkGlyphCache.h>

namespace android {
namespace uirenderer {

SkColor TestUtils::interpolateColor(float fraction, SkColor start, SkColor end) {
    int startA = (start >> 24) & 0xff;
    int startR = (start >> 16) & 0xff;
    int startG = (start >> 8) & 0xff;
    int startB = start & 0xff;

    int endA = (end >> 24) & 0xff;
    int endR = (end >> 16) & 0xff;
    int endG = (end >> 8) & 0xff;
    int endB = end & 0xff;

    return (int)((startA + (int)(fraction * (endA - startA))) << 24)
            | (int)((startR + (int)(fraction * (endR - startR))) << 16)
            | (int)((startG + (int)(fraction * (endG - startG))) << 8)
            | (int)((startB + (int)(fraction * (endB - startB))));
}

sp<DeferredLayerUpdater> TestUtils::createTextureLayerUpdater(
        renderthread::RenderThread& renderThread) {
    android::uirenderer::renderthread::IRenderPipeline* pipeline;
    if (Properties::getRenderPipelineType() == RenderPipelineType::OpenGL) {
        pipeline = new renderthread::OpenGLPipeline(renderThread);
    } else if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaGL) {
        pipeline = new skiapipeline::SkiaOpenGLPipeline(renderThread);
    } else {
        pipeline = new skiapipeline::SkiaVulkanPipeline(renderThread);
    }
    sp<DeferredLayerUpdater> layerUpdater = pipeline->createTextureLayer();
    layerUpdater->apply();
    delete pipeline;
    return layerUpdater;
}

sp<DeferredLayerUpdater> TestUtils::createTextureLayerUpdater(
        renderthread::RenderThread& renderThread, uint32_t width, uint32_t height,
        const SkMatrix& transform) {
    sp<DeferredLayerUpdater> layerUpdater = createTextureLayerUpdater(renderThread);
    layerUpdater->backingLayer()->getTransform().load(transform);
    layerUpdater->setSize(width, height);
    layerUpdater->setTransform(&transform);

    // updateLayer so it's ready to draw
    layerUpdater->updateLayer(true, Matrix4::identity().data);
    if (layerUpdater->backingLayer()->getApi() == Layer::Api::OpenGL) {
        static_cast<GlLayer*>(layerUpdater->backingLayer())->setRenderTarget(
                GL_TEXTURE_EXTERNAL_OES);
    }
    return layerUpdater;
}

void TestUtils::layoutTextUnscaled(const SkPaint& paint, const char* text,
        std::vector<glyph_t>* outGlyphs, std::vector<float>* outPositions,
        float* outTotalAdvance, Rect* outBounds) {
    Rect bounds;
    float totalAdvance = 0;
    SkSurfaceProps surfaceProps(0, kUnknown_SkPixelGeometry);
    SkAutoGlyphCacheNoGamma autoCache(paint, &surfaceProps, &SkMatrix::I());
    while (*text != '\0') {
        size_t nextIndex = 0;
        int32_t unichar = utf32_from_utf8_at(text, 4, 0, &nextIndex);
        text += nextIndex;

        glyph_t glyph = autoCache.getCache()->unicharToGlyph(unichar);
        autoCache.getCache()->unicharToGlyph(unichar);

        // push glyph and its relative position
        outGlyphs->push_back(glyph);
        outPositions->push_back(totalAdvance);
        outPositions->push_back(0);

        // compute bounds
        SkGlyph skGlyph = autoCache.getCache()->getUnicharMetrics(unichar);
        Rect glyphBounds(skGlyph.fWidth, skGlyph.fHeight);
        glyphBounds.translate(totalAdvance + skGlyph.fLeft, skGlyph.fTop);
        bounds.unionWith(glyphBounds);

        // advance next character
        SkScalar skWidth;
        paint.getTextWidths(&glyph, sizeof(glyph), &skWidth, NULL);
        totalAdvance += skWidth;
    }
    *outBounds = bounds;
    *outTotalAdvance = totalAdvance;
}


void TestUtils::drawUtf8ToCanvas(Canvas* canvas, const char* text,
        const SkPaint& paint, float x, float y) {
    auto utf16 = asciiToUtf16(text);
    canvas->drawText(utf16.get(), 0, strlen(text), strlen(text), x, y, 0, paint, nullptr);
}

void TestUtils::drawUtf8ToCanvas(Canvas* canvas, const char* text,
        const SkPaint& paint, const SkPath& path) {
    auto utf16 = asciiToUtf16(text);
    canvas->drawTextOnPath(utf16.get(), strlen(text), 0, path, 0, 0, paint, nullptr);
}

void TestUtils::TestTask::run() {
    // RenderState only valid once RenderThread is running, so queried here
    renderthread::RenderThread& renderThread = renderthread::RenderThread::getInstance();
    if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaVulkan) {
        renderThread.vulkanManager().initialize();
    } else {
        renderThread.eglManager().initialize();
    }

    rtCallback(renderThread);

    if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaVulkan) {
        renderThread.vulkanManager().destroy();
    } else {
        renderThread.renderState().flush(Caches::FlushMode::Full);
        renderThread.eglManager().destroy();
    }
}

std::unique_ptr<uint16_t[]> TestUtils::asciiToUtf16(const char* str) {
    const int length = strlen(str);
    std::unique_ptr<uint16_t[]> utf16(new uint16_t[length]);
    for (int i = 0; i < length; i++) {
        utf16.get()[i] = str[i];
    }
    return utf16;
}

SkColor TestUtils::getColor(const sk_sp<SkSurface>& surface, int x, int y) {
    SkPixmap pixmap;
    if (!surface->peekPixels(&pixmap)) {
        return 0;
    }
    switch (pixmap.colorType()) {
        case kGray_8_SkColorType: {
            const uint8_t* addr = pixmap.addr8(x, y);
            return SkColorSetRGB(*addr, *addr, *addr);
        }
        case kAlpha_8_SkColorType: {
            const uint8_t* addr = pixmap.addr8(x, y);
            return SkColorSetA(0, addr[0]);
        }
        case kRGB_565_SkColorType: {
            const uint16_t* addr = pixmap.addr16(x, y);
            return SkPixel16ToColor(addr[0]);
        }
        case kARGB_4444_SkColorType: {
            const uint16_t* addr = pixmap.addr16(x, y);
            SkPMColor c = SkPixel4444ToPixel32(addr[0]);
            return SkUnPreMultiply::PMColorToColor(c);
        }
        case kBGRA_8888_SkColorType: {
            const uint32_t* addr = pixmap.addr32(x, y);
            SkPMColor c = SkSwizzle_BGRA_to_PMColor(addr[0]);
            return SkUnPreMultiply::PMColorToColor(c);
        }
        case kRGBA_8888_SkColorType: {
            const uint32_t* addr = pixmap.addr32(x, y);
            SkPMColor c = SkSwizzle_RGBA_to_PMColor(addr[0]);
            return SkUnPreMultiply::PMColorToColor(c);
        }
        default:
            return 0;
    }
    return 0;
}

SkRect TestUtils::getClipBounds(const SkCanvas* canvas) {
    return SkRect::Make(canvas->getDeviceClipBounds());
}

SkRect TestUtils::getLocalClipBounds(const SkCanvas* canvas) {
    SkMatrix invertedTotalMatrix;
    if (!canvas->getTotalMatrix().invert(&invertedTotalMatrix)) {
        return SkRect::MakeEmpty();
    }
    SkRect outlineInDeviceCoord = TestUtils::getClipBounds(canvas);
    SkRect outlineInLocalCoord;
    invertedTotalMatrix.mapRect(&outlineInLocalCoord, outlineInDeviceCoord);
    return outlineInLocalCoord;
}

} /* namespace uirenderer */
} /* namespace android */
