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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 #include "GlopBuilder.h"
     17 
     18 #include "Caches.h"
     19 #include "Glop.h"
     20 #include "Matrix.h"
     21 #include "Patch.h"
     22 #include "renderstate/MeshState.h"
     23 #include "renderstate/RenderState.h"
     24 #include "SkiaShader.h"
     25 #include "Texture.h"
     26 #include "utils/PaintUtils.h"
     27 #include "VertexBuffer.h"
     28 
     29 #include <GLES2/gl2.h>
     30 #include <SkPaint.h>
     31 
     32 #define DEBUG_GLOP_BUILDER 0
     33 
     34 #if DEBUG_GLOP_BUILDER
     35 
     36 #define TRIGGER_STAGE(stageFlag) \
     37     LOG_ALWAYS_FATAL_IF((stageFlag) & mStageFlags, "Stage %d cannot be run twice", (stageFlag)); \
     38     mStageFlags = static_cast<StageFlags>(mStageFlags | (stageFlag))
     39 
     40 #define REQUIRE_STAGES(requiredFlags) \
     41     LOG_ALWAYS_FATAL_IF((mStageFlags & (requiredFlags)) != (requiredFlags), \
     42             "not prepared for current stage")
     43 
     44 #else
     45 
     46 #define TRIGGER_STAGE(stageFlag) ((void)0)
     47 #define REQUIRE_STAGES(requiredFlags) ((void)0)
     48 
     49 #endif
     50 
     51 namespace android {
     52 namespace uirenderer {
     53 
     54 static void setUnitQuadTextureCoords(Rect uvs, TextureVertex* quadVertex) {
     55     quadVertex[0] = {0, 0, uvs.left, uvs.top};
     56     quadVertex[1] = {1, 0, uvs.right, uvs.top};
     57     quadVertex[2] = {0, 1, uvs.left, uvs.bottom};
     58     quadVertex[3] = {1, 1, uvs.right, uvs.bottom};
     59 }
     60 
     61 GlopBuilder::GlopBuilder(RenderState& renderState, Caches& caches, Glop* outGlop)
     62         : mRenderState(renderState)
     63         , mCaches(caches)
     64         , mShader(nullptr)
     65         , mOutGlop(outGlop) {
     66     mStageFlags = kInitialStage;
     67 }
     68 
     69 ////////////////////////////////////////////////////////////////////////////////
     70 // Mesh
     71 ////////////////////////////////////////////////////////////////////////////////
     72 
     73 GlopBuilder& GlopBuilder::setMeshUnitQuad() {
     74     TRIGGER_STAGE(kMeshStage);
     75 
     76     mOutGlop->mesh.primitiveMode = GL_TRIANGLE_STRIP;
     77     mOutGlop->mesh.indices = { 0, nullptr };
     78     mOutGlop->mesh.vertices = {
     79             mRenderState.meshState().getUnitQuadVBO(),
     80             VertexAttribFlags::None,
     81             nullptr, nullptr, nullptr,
     82             kTextureVertexStride };
     83     mOutGlop->mesh.elementCount = 4;
     84     return *this;
     85 }
     86 
     87 GlopBuilder& GlopBuilder::setMeshTexturedUnitQuad(const UvMapper* uvMapper) {
     88     if (uvMapper) {
     89         // can't use unit quad VBO, so build UV vertices manually
     90         return setMeshTexturedUvQuad(uvMapper, Rect(0, 0, 1, 1));
     91     }
     92 
     93     TRIGGER_STAGE(kMeshStage);
     94 
     95     mOutGlop->mesh.primitiveMode = GL_TRIANGLE_STRIP;
     96     mOutGlop->mesh.indices = { 0, nullptr };
     97     mOutGlop->mesh.vertices = {
     98             mRenderState.meshState().getUnitQuadVBO(),
     99             VertexAttribFlags::TextureCoord,
    100             nullptr, (const void*) kMeshTextureOffset, nullptr,
    101             kTextureVertexStride };
    102     mOutGlop->mesh.elementCount = 4;
    103     return *this;
    104 }
    105 
    106 GlopBuilder& GlopBuilder::setMeshTexturedUvQuad(const UvMapper* uvMapper, Rect uvs) {
    107     TRIGGER_STAGE(kMeshStage);
    108 
    109     if (CC_UNLIKELY(uvMapper)) {
    110         uvMapper->map(uvs);
    111     }
    112     setUnitQuadTextureCoords(uvs, &mOutGlop->mesh.mappedVertices[0]);
    113 
    114     const TextureVertex* textureVertex = mOutGlop->mesh.mappedVertices;
    115     mOutGlop->mesh.primitiveMode = GL_TRIANGLE_STRIP;
    116     mOutGlop->mesh.indices = { 0, nullptr };
    117     mOutGlop->mesh.vertices = {
    118             0,
    119             VertexAttribFlags::TextureCoord,
    120             &textureVertex[0].x, &textureVertex[0].u, nullptr,
    121             kTextureVertexStride };
    122     mOutGlop->mesh.elementCount = 4;
    123     return *this;
    124 }
    125 
    126 GlopBuilder& GlopBuilder::setMeshIndexedQuads(Vertex* vertexData, int quadCount) {
    127     TRIGGER_STAGE(kMeshStage);
    128 
    129     mOutGlop->mesh.primitiveMode = GL_TRIANGLES;
    130     mOutGlop->mesh.indices = { mRenderState.meshState().getQuadListIBO(), nullptr };
    131     mOutGlop->mesh.vertices = {
    132             0,
    133             VertexAttribFlags::None,
    134             vertexData, nullptr, nullptr,
    135             kVertexStride };
    136     mOutGlop->mesh.elementCount = 6 * quadCount;
    137     return *this;
    138 }
    139 
    140 GlopBuilder& GlopBuilder::setMeshTexturedIndexedQuads(TextureVertex* vertexData, int elementCount) {
    141     TRIGGER_STAGE(kMeshStage);
    142 
    143     mOutGlop->mesh.primitiveMode = GL_TRIANGLES;
    144     mOutGlop->mesh.indices = { mRenderState.meshState().getQuadListIBO(), nullptr };
    145     mOutGlop->mesh.vertices = {
    146             0,
    147             VertexAttribFlags::TextureCoord,
    148             &vertexData[0].x, &vertexData[0].u, nullptr,
    149             kTextureVertexStride };
    150     mOutGlop->mesh.elementCount = elementCount;
    151     return *this;
    152 }
    153 
    154 GlopBuilder& GlopBuilder::setMeshTexturedMesh(TextureVertex* vertexData, int elementCount) {
    155     TRIGGER_STAGE(kMeshStage);
    156 
    157     mOutGlop->mesh.primitiveMode = GL_TRIANGLES;
    158     mOutGlop->mesh.indices = { 0, nullptr };
    159     mOutGlop->mesh.vertices = {
    160             0,
    161             VertexAttribFlags::TextureCoord,
    162             &vertexData[0].x, &vertexData[0].u, nullptr,
    163             kTextureVertexStride };
    164     mOutGlop->mesh.elementCount = elementCount;
    165     return *this;
    166 }
    167 
    168 GlopBuilder& GlopBuilder::setMeshColoredTexturedMesh(ColorTextureVertex* vertexData, int elementCount) {
    169     TRIGGER_STAGE(kMeshStage);
    170 
    171     mOutGlop->mesh.primitiveMode = GL_TRIANGLES;
    172     mOutGlop->mesh.indices = { 0, nullptr };
    173     mOutGlop->mesh.vertices = {
    174             0,
    175             VertexAttribFlags::TextureCoord | VertexAttribFlags::Color,
    176             &vertexData[0].x, &vertexData[0].u, &vertexData[0].r,
    177             kColorTextureVertexStride };
    178     mOutGlop->mesh.elementCount = elementCount;
    179     return *this;
    180 }
    181 
    182 GlopBuilder& GlopBuilder::setMeshVertexBuffer(const VertexBuffer& vertexBuffer, bool shadowInterp) {
    183     TRIGGER_STAGE(kMeshStage);
    184 
    185     const VertexBuffer::MeshFeatureFlags flags = vertexBuffer.getMeshFeatureFlags();
    186 
    187     bool alphaVertex = flags & VertexBuffer::kAlpha;
    188     bool indices = flags & VertexBuffer::kIndices;
    189 
    190     mOutGlop->mesh.primitiveMode = GL_TRIANGLE_STRIP;
    191     mOutGlop->mesh.indices = { 0, vertexBuffer.getIndices() };
    192     mOutGlop->mesh.vertices = {
    193             0,
    194             alphaVertex ? VertexAttribFlags::Alpha : VertexAttribFlags::None,
    195             vertexBuffer.getBuffer(), nullptr, nullptr,
    196             alphaVertex ? kAlphaVertexStride : kVertexStride };
    197     mOutGlop->mesh.elementCount = indices
    198                 ? vertexBuffer.getIndexCount() : vertexBuffer.getVertexCount();
    199 
    200     mDescription.useShadowAlphaInterp = shadowInterp;
    201     return *this;
    202 }
    203 
    204 GlopBuilder& GlopBuilder::setMeshPatchQuads(const Patch& patch) {
    205     TRIGGER_STAGE(kMeshStage);
    206 
    207     mOutGlop->mesh.primitiveMode = GL_TRIANGLES;
    208     mOutGlop->mesh.indices = { mRenderState.meshState().getQuadListIBO(), nullptr };
    209     mOutGlop->mesh.vertices = {
    210             mCaches.patchCache.getMeshBuffer(),
    211             VertexAttribFlags::TextureCoord,
    212             (void*)patch.positionOffset, (void*)patch.textureOffset, nullptr,
    213             kTextureVertexStride };
    214     mOutGlop->mesh.elementCount = patch.indexCount;
    215     return *this;
    216 }
    217 
    218 ////////////////////////////////////////////////////////////////////////////////
    219 // Fill
    220 ////////////////////////////////////////////////////////////////////////////////
    221 
    222 void GlopBuilder::setFill(int color, float alphaScale,
    223         SkXfermode::Mode mode, Blend::ModeOrderSwap modeUsage,
    224         const SkShader* shader, const SkColorFilter* colorFilter) {
    225     if (mode != SkXfermode::kClear_Mode) {
    226         float alpha = (SkColorGetA(color) / 255.0f) * alphaScale;
    227         if (!shader) {
    228             float colorScale = alpha / 255.0f;
    229             mOutGlop->fill.color = {
    230                     colorScale * SkColorGetR(color),
    231                     colorScale * SkColorGetG(color),
    232                     colorScale * SkColorGetB(color),
    233                     alpha
    234             };
    235         } else {
    236             mOutGlop->fill.color = { 1, 1, 1, alpha };
    237         }
    238     } else {
    239         mOutGlop->fill.color = { 0, 0, 0, 1 };
    240     }
    241 
    242     mOutGlop->blend = { GL_ZERO, GL_ZERO };
    243     if (mOutGlop->fill.color.a < 1.0f
    244             || (mOutGlop->mesh.vertices.attribFlags & VertexAttribFlags::Alpha)
    245             || (mOutGlop->fill.texture.texture && mOutGlop->fill.texture.texture->blend)
    246             || mOutGlop->roundRectClipState
    247             || PaintUtils::isBlendedShader(shader)
    248             || PaintUtils::isBlendedColorFilter(colorFilter)
    249             || mode != SkXfermode::kSrcOver_Mode) {
    250         if (CC_LIKELY(mode <= SkXfermode::kScreen_Mode)) {
    251             Blend::getFactors(mode, modeUsage,
    252                     &mOutGlop->blend.src, &mOutGlop->blend.dst);
    253         } else {
    254             // These blend modes are not supported by OpenGL directly and have
    255             // to be implemented using shaders. Since the shader will perform
    256             // the blending, don't enable GL blending off here
    257             // If the blend mode cannot be implemented using shaders, fall
    258             // back to the default SrcOver blend mode instead
    259             if (CC_UNLIKELY(mCaches.extensions().hasFramebufferFetch())) {
    260                 mDescription.framebufferMode = mode;
    261                 mDescription.swapSrcDst = (modeUsage == Blend::ModeOrderSwap::Swap);
    262                 // blending in shader, don't enable
    263             } else {
    264                 // unsupported
    265                 Blend::getFactors(SkXfermode::kSrcOver_Mode, modeUsage,
    266                         &mOutGlop->blend.src, &mOutGlop->blend.dst);
    267             }
    268         }
    269     }
    270     mShader = shader; // shader resolved in ::build()
    271 
    272     if (colorFilter) {
    273         SkColor color;
    274         SkXfermode::Mode mode;
    275         SkScalar srcColorMatrix[20];
    276         if (colorFilter->asColorMode(&color, &mode)) {
    277             mOutGlop->fill.filterMode = mDescription.colorOp = ProgramDescription::kColorBlend;
    278             mDescription.colorMode = mode;
    279 
    280             const float alpha = SkColorGetA(color) / 255.0f;
    281             float colorScale = alpha / 255.0f;
    282             mOutGlop->fill.filter.color = {
    283                     colorScale * SkColorGetR(color),
    284                     colorScale * SkColorGetG(color),
    285                     colorScale * SkColorGetB(color),
    286                     alpha,
    287             };
    288         } else if (colorFilter->asColorMatrix(srcColorMatrix)) {
    289             mOutGlop->fill.filterMode = mDescription.colorOp = ProgramDescription::kColorMatrix;
    290 
    291             float* colorMatrix = mOutGlop->fill.filter.matrix.matrix;
    292             memcpy(colorMatrix, srcColorMatrix, 4 * sizeof(float));
    293             memcpy(&colorMatrix[4], &srcColorMatrix[5], 4 * sizeof(float));
    294             memcpy(&colorMatrix[8], &srcColorMatrix[10], 4 * sizeof(float));
    295             memcpy(&colorMatrix[12], &srcColorMatrix[15], 4 * sizeof(float));
    296 
    297             // Skia uses the range [0..255] for the addition vector, but we need
    298             // the [0..1] range to apply the vector in GLSL
    299             float* colorVector = mOutGlop->fill.filter.matrix.vector;
    300             colorVector[0] = srcColorMatrix[4] / 255.0f;
    301             colorVector[1] = srcColorMatrix[9] / 255.0f;
    302             colorVector[2] = srcColorMatrix[14] / 255.0f;
    303             colorVector[3] = srcColorMatrix[19] / 255.0f;
    304         } else {
    305             LOG_ALWAYS_FATAL("unsupported ColorFilter");
    306         }
    307     } else {
    308         mOutGlop->fill.filterMode = ProgramDescription::kColorNone;
    309     }
    310 }
    311 
    312 GlopBuilder& GlopBuilder::setFillTexturePaint(Texture& texture,
    313         const int textureFillFlags, const SkPaint* paint, float alphaScale) {
    314     TRIGGER_STAGE(kFillStage);
    315     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    316 
    317     GLenum filter = (textureFillFlags & TextureFillFlags::ForceFilter)
    318             ? GL_LINEAR : PaintUtils::getFilter(paint);
    319     mOutGlop->fill.texture = { &texture,
    320             GL_TEXTURE_2D, filter, GL_CLAMP_TO_EDGE, nullptr };
    321 
    322     if (paint) {
    323         int color = paint->getColor();
    324         SkShader* shader = paint->getShader();
    325 
    326         if (!(textureFillFlags & TextureFillFlags::IsAlphaMaskTexture)) {
    327             // Texture defines color, so disable shaders, and reset all non-alpha color channels
    328             color |= 0x00FFFFFF;
    329             shader = nullptr;
    330         }
    331         setFill(color, alphaScale,
    332                 PaintUtils::getXfermode(paint->getXfermode()), Blend::ModeOrderSwap::NoSwap,
    333                 shader, paint->getColorFilter());
    334     } else {
    335         mOutGlop->fill.color = { alphaScale, alphaScale, alphaScale, alphaScale };
    336 
    337         if (alphaScale < 1.0f
    338                 || (mOutGlop->mesh.vertices.attribFlags & VertexAttribFlags::Alpha)
    339                 || texture.blend
    340                 || mOutGlop->roundRectClipState) {
    341             Blend::getFactors(SkXfermode::kSrcOver_Mode, Blend::ModeOrderSwap::NoSwap,
    342                     &mOutGlop->blend.src, &mOutGlop->blend.dst);
    343         } else {
    344             mOutGlop->blend = { GL_ZERO, GL_ZERO };
    345         }
    346     }
    347 
    348     if (textureFillFlags & TextureFillFlags::IsAlphaMaskTexture) {
    349         mDescription.modulate = mOutGlop->fill.color.isNotBlack();
    350         mDescription.hasAlpha8Texture = true;
    351     } else {
    352         mDescription.modulate = mOutGlop->fill.color.a < 1.0f;
    353     }
    354     return *this;
    355 }
    356 
    357 GlopBuilder& GlopBuilder::setFillPaint(const SkPaint& paint, float alphaScale) {
    358     TRIGGER_STAGE(kFillStage);
    359     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    360 
    361     mOutGlop->fill.texture = { nullptr, GL_INVALID_ENUM, GL_INVALID_ENUM, GL_INVALID_ENUM, nullptr };
    362 
    363     setFill(paint.getColor(), alphaScale,
    364             PaintUtils::getXfermode(paint.getXfermode()), Blend::ModeOrderSwap::NoSwap,
    365             paint.getShader(), paint.getColorFilter());
    366     mDescription.modulate = mOutGlop->fill.color.a < 1.0f;
    367     return *this;
    368 }
    369 
    370 GlopBuilder& GlopBuilder::setFillPathTexturePaint(PathTexture& texture,
    371         const SkPaint& paint, float alphaScale) {
    372     TRIGGER_STAGE(kFillStage);
    373     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    374 
    375     //specify invalid filter/clamp, since these are always static for PathTextures
    376     mOutGlop->fill.texture = { &texture, GL_TEXTURE_2D, GL_INVALID_ENUM, GL_INVALID_ENUM, nullptr };
    377 
    378     setFill(paint.getColor(), alphaScale,
    379             PaintUtils::getXfermode(paint.getXfermode()), Blend::ModeOrderSwap::NoSwap,
    380             paint.getShader(), paint.getColorFilter());
    381 
    382     mDescription.hasAlpha8Texture = true;
    383     mDescription.modulate = mOutGlop->fill.color.isNotBlack();
    384     return *this;
    385 }
    386 
    387 GlopBuilder& GlopBuilder::setFillShadowTexturePaint(ShadowTexture& texture, int shadowColor,
    388         const SkPaint& paint, float alphaScale) {
    389     TRIGGER_STAGE(kFillStage);
    390     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    391 
    392     //specify invalid filter/clamp, since these are always static for ShadowTextures
    393     mOutGlop->fill.texture = { &texture, GL_TEXTURE_2D, GL_INVALID_ENUM, GL_INVALID_ENUM, nullptr };
    394 
    395     const int ALPHA_BITMASK = SK_ColorBLACK;
    396     const int COLOR_BITMASK = ~ALPHA_BITMASK;
    397     if ((shadowColor & ALPHA_BITMASK) == ALPHA_BITMASK) {
    398         // shadow color is fully opaque: override its alpha with that of paint
    399         shadowColor &= paint.getColor() | COLOR_BITMASK;
    400     }
    401 
    402     setFill(shadowColor, alphaScale,
    403             PaintUtils::getXfermode(paint.getXfermode()), Blend::ModeOrderSwap::NoSwap,
    404             paint.getShader(), paint.getColorFilter());
    405 
    406     mDescription.hasAlpha8Texture = true;
    407     mDescription.modulate = mOutGlop->fill.color.isNotBlack();
    408     return *this;
    409 }
    410 
    411 GlopBuilder& GlopBuilder::setFillBlack() {
    412     TRIGGER_STAGE(kFillStage);
    413     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    414 
    415     mOutGlop->fill.texture = { nullptr, GL_INVALID_ENUM, GL_INVALID_ENUM, GL_INVALID_ENUM, nullptr };
    416     setFill(SK_ColorBLACK, 1.0f, SkXfermode::kSrcOver_Mode, Blend::ModeOrderSwap::NoSwap,
    417             nullptr, nullptr);
    418     return *this;
    419 }
    420 
    421 GlopBuilder& GlopBuilder::setFillClear() {
    422     TRIGGER_STAGE(kFillStage);
    423     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    424 
    425     mOutGlop->fill.texture = { nullptr, GL_INVALID_ENUM, GL_INVALID_ENUM, GL_INVALID_ENUM, nullptr };
    426     setFill(SK_ColorBLACK, 1.0f, SkXfermode::kClear_Mode, Blend::ModeOrderSwap::NoSwap,
    427             nullptr, nullptr);
    428     return *this;
    429 }
    430 
    431 GlopBuilder& GlopBuilder::setFillLayer(Texture& texture, const SkColorFilter* colorFilter,
    432         float alpha, SkXfermode::Mode mode, Blend::ModeOrderSwap modeUsage) {
    433     TRIGGER_STAGE(kFillStage);
    434     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    435 
    436     mOutGlop->fill.texture = { &texture,
    437             GL_TEXTURE_2D, GL_LINEAR, GL_CLAMP_TO_EDGE, nullptr };
    438     mOutGlop->fill.color = { alpha, alpha, alpha, alpha };
    439 
    440     setFill(SK_ColorWHITE, alpha, mode, modeUsage, nullptr, colorFilter);
    441 
    442     mDescription.modulate = mOutGlop->fill.color.a < 1.0f;
    443     return *this;
    444 }
    445 
    446 GlopBuilder& GlopBuilder::setFillTextureLayer(Layer& layer, float alpha) {
    447     TRIGGER_STAGE(kFillStage);
    448     REQUIRE_STAGES(kMeshStage | kRoundRectClipStage);
    449 
    450     mOutGlop->fill.texture = { &(layer.getTexture()),
    451             layer.getRenderTarget(), GL_LINEAR, GL_CLAMP_TO_EDGE, &layer.getTexTransform() };
    452     mOutGlop->fill.color = { alpha, alpha, alpha, alpha };
    453 
    454     setFill(SK_ColorWHITE, alpha, layer.getMode(), Blend::ModeOrderSwap::NoSwap,
    455             nullptr, layer.getColorFilter());
    456 
    457     mDescription.modulate = mOutGlop->fill.color.a < 1.0f;
    458     mDescription.hasTextureTransform = true;
    459     return *this;
    460 }
    461 
    462 ////////////////////////////////////////////////////////////////////////////////
    463 // Transform
    464 ////////////////////////////////////////////////////////////////////////////////
    465 
    466 void GlopBuilder::setTransform(const Matrix4& ortho, const Matrix4& canvas,
    467         const int transformFlags) {
    468     TRIGGER_STAGE(kTransformStage);
    469 
    470     mOutGlop->transform.ortho.load(ortho);
    471     mOutGlop->transform.canvas.load(canvas);
    472     mOutGlop->transform.transformFlags = transformFlags;
    473 }
    474 
    475 ////////////////////////////////////////////////////////////////////////////////
    476 // ModelView
    477 ////////////////////////////////////////////////////////////////////////////////
    478 
    479 GlopBuilder& GlopBuilder::setModelViewMapUnitToRect(const Rect destination) {
    480     TRIGGER_STAGE(kModelViewStage);
    481 
    482     mOutGlop->transform.modelView.loadTranslate(destination.left, destination.top, 0.0f);
    483     mOutGlop->transform.modelView.scale(destination.getWidth(), destination.getHeight(), 1.0f);
    484     mOutGlop->bounds = destination;
    485     return *this;
    486 }
    487 
    488 GlopBuilder& GlopBuilder::setModelViewMapUnitToRectSnap(const Rect destination) {
    489     TRIGGER_STAGE(kModelViewStage);
    490     REQUIRE_STAGES(kTransformStage | kFillStage);
    491 
    492     float left = destination.left;
    493     float top = destination.top;
    494 
    495     const Matrix4& meshTransform = mOutGlop->transform.meshTransform();
    496     if (CC_LIKELY(meshTransform.isPureTranslate())) {
    497         // snap by adjusting the model view matrix
    498         const float translateX = meshTransform.getTranslateX();
    499         const float translateY = meshTransform.getTranslateY();
    500 
    501         left = (int) floorf(left + translateX + 0.5f) - translateX;
    502         top = (int) floorf(top + translateY + 0.5f) - translateY;
    503         mOutGlop->fill.texture.filter = GL_NEAREST;
    504     }
    505 
    506     mOutGlop->transform.modelView.loadTranslate(left, top, 0.0f);
    507     mOutGlop->transform.modelView.scale(destination.getWidth(), destination.getHeight(), 1.0f);
    508     mOutGlop->bounds = destination;
    509     return *this;
    510 }
    511 
    512 GlopBuilder& GlopBuilder::setModelViewOffsetRect(float offsetX, float offsetY, const Rect source) {
    513     TRIGGER_STAGE(kModelViewStage);
    514 
    515     mOutGlop->transform.modelView.loadTranslate(offsetX, offsetY, 0.0f);
    516     mOutGlop->bounds = source;
    517     mOutGlop->bounds.translate(offsetX, offsetY);
    518     return *this;
    519 }
    520 
    521 GlopBuilder& GlopBuilder::setModelViewOffsetRectSnap(float offsetX, float offsetY, const Rect source) {
    522     TRIGGER_STAGE(kModelViewStage);
    523     REQUIRE_STAGES(kTransformStage | kFillStage);
    524 
    525     const Matrix4& meshTransform = mOutGlop->transform.meshTransform();
    526     if (CC_LIKELY(meshTransform.isPureTranslate())) {
    527         // snap by adjusting the model view matrix
    528         const float translateX = meshTransform.getTranslateX();
    529         const float translateY = meshTransform.getTranslateY();
    530 
    531         offsetX = (int) floorf(offsetX + translateX + source.left + 0.5f) - translateX - source.left;
    532         offsetY = (int) floorf(offsetY + translateY + source.top + 0.5f) - translateY - source.top;
    533         mOutGlop->fill.texture.filter = GL_NEAREST;
    534     }
    535 
    536     mOutGlop->transform.modelView.loadTranslate(offsetX, offsetY, 0.0f);
    537     mOutGlop->bounds = source;
    538     mOutGlop->bounds.translate(offsetX, offsetY);
    539     return *this;
    540 }
    541 
    542 ////////////////////////////////////////////////////////////////////////////////
    543 // RoundRectClip
    544 ////////////////////////////////////////////////////////////////////////////////
    545 
    546 GlopBuilder& GlopBuilder::setRoundRectClipState(const RoundRectClipState* roundRectClipState) {
    547     TRIGGER_STAGE(kRoundRectClipStage);
    548 
    549     mOutGlop->roundRectClipState = roundRectClipState;
    550     mDescription.hasRoundRectClip = roundRectClipState != nullptr;
    551     return *this;
    552 }
    553 
    554 ////////////////////////////////////////////////////////////////////////////////
    555 // Build
    556 ////////////////////////////////////////////////////////////////////////////////
    557 
    558 void verify(const ProgramDescription& description, const Glop& glop) {
    559     if (glop.fill.texture.texture != nullptr) {
    560         LOG_ALWAYS_FATAL_IF(((description.hasTexture && description.hasExternalTexture)
    561                         || (!description.hasTexture && !description.hasExternalTexture)
    562                         || ((glop.mesh.vertices.attribFlags & VertexAttribFlags::TextureCoord) == 0)),
    563                 "Texture %p, hT%d, hET %d, attribFlags %x",
    564                 glop.fill.texture.texture,
    565                 description.hasTexture, description.hasExternalTexture,
    566                 glop.mesh.vertices.attribFlags);
    567     } else {
    568         LOG_ALWAYS_FATAL_IF((description.hasTexture
    569                         || description.hasExternalTexture
    570                         || ((glop.mesh.vertices.attribFlags & VertexAttribFlags::TextureCoord) != 0)),
    571                 "No texture, hT%d, hET %d, attribFlags %x",
    572                 description.hasTexture, description.hasExternalTexture,
    573                 glop.mesh.vertices.attribFlags);
    574     }
    575 
    576     if ((glop.mesh.vertices.attribFlags & VertexAttribFlags::Alpha)
    577             && glop.mesh.vertices.bufferObject) {
    578         LOG_ALWAYS_FATAL("VBO and alpha attributes are not currently compatible");
    579     }
    580 
    581     if (description.hasTextureTransform != (glop.fill.texture.textureTransform != nullptr)) {
    582         LOG_ALWAYS_FATAL("Texture transform incorrectly specified");
    583     }
    584 }
    585 
    586 void GlopBuilder::build() {
    587     REQUIRE_STAGES(kAllStages);
    588     if (mOutGlop->mesh.vertices.attribFlags & VertexAttribFlags::TextureCoord) {
    589         if (mOutGlop->fill.texture.target == GL_TEXTURE_2D) {
    590             mDescription.hasTexture = true;
    591         } else {
    592             mDescription.hasExternalTexture = true;
    593         }
    594     }
    595 
    596     mDescription.hasColors = mOutGlop->mesh.vertices.attribFlags & VertexAttribFlags::Color;
    597     mDescription.hasVertexAlpha = mOutGlop->mesh.vertices.attribFlags & VertexAttribFlags::Alpha;
    598 
    599     // Enable debug highlight when what we're about to draw is tested against
    600     // the stencil buffer and if stencil highlight debugging is on
    601     mDescription.hasDebugHighlight = !Properties::debugOverdraw
    602             && Properties::debugStencilClip == StencilClipDebug::ShowHighlight
    603             && mRenderState.stencil().isTestEnabled();
    604 
    605     // serialize shader info into ShaderData
    606     GLuint textureUnit = mOutGlop->fill.texture.texture ? 1 : 0;
    607 
    608     if (CC_LIKELY(!mShader)) {
    609         mOutGlop->fill.skiaShaderData.skiaShaderType = kNone_SkiaShaderType;
    610     } else {
    611         Matrix4 shaderMatrix;
    612         if (mOutGlop->transform.transformFlags & TransformFlags::MeshIgnoresCanvasTransform) {
    613             // canvas level transform was built into the modelView and geometry,
    614             // so the shader matrix must reverse this
    615             shaderMatrix.loadInverse(mOutGlop->transform.canvas);
    616             shaderMatrix.multiply(mOutGlop->transform.modelView);
    617         } else {
    618             shaderMatrix.load(mOutGlop->transform.modelView);
    619         }
    620         SkiaShader::store(mCaches, *mShader, shaderMatrix,
    621                 &textureUnit, &mDescription, &(mOutGlop->fill.skiaShaderData));
    622     }
    623 
    624     // duplicates ProgramCache's definition of color uniform presence
    625     const bool singleColor = !mDescription.hasTexture
    626             && !mDescription.hasExternalTexture
    627             && !mDescription.hasGradient
    628             && !mDescription.hasBitmap;
    629     mOutGlop->fill.colorEnabled = mDescription.modulate || singleColor;
    630 
    631     verify(mDescription, *mOutGlop);
    632 
    633     // Final step: populate program and map bounds into render target space
    634     mOutGlop->fill.program = mCaches.programCache.get(mDescription);
    635     mOutGlop->transform.meshTransform().mapRect(mOutGlop->bounds);
    636 }
    637 
    638 } /* namespace uirenderer */
    639 } /* namespace android */
    640