+/*
+ * Copyright (c) 2021 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ *
+ */
+
+// HEADER
+#include <dali-toolkit/internal/text/text-controller-background-actor.h>
+
+// EXTERNAL INCLUDES
+#include <dali/public-api/rendering/renderer.h>
+
+// INTERNAL INCLUDES
+#include <dali-toolkit/devel-api/controls/control-depth-index-ranges.h>
+#include <dali-toolkit/internal/graphics/builtin-shader-extern-gen.h>
+#include <dali-toolkit/internal/text/text-view.h>
+
+namespace Dali::Toolkit::Text
+{
+
+namespace
+{
+struct BackgroundVertex
+{
+ Vector2 mPosition; ///< Vertex posiiton
+ Vector4 mColor; ///< Vertex color
+};
+
+struct BackgroundMesh
+{
+ Vector<BackgroundVertex> mVertices; ///< container of vertices
+ Vector<unsigned short> mIndices; ///< container of indices
+};
+} // unnamed namespace
+
+Actor CreateControllerBackgroundActor(const View& textView, const VisualModelPtr& textVisualModel, Shader& textShaderBackground)
+{
+ // NOTE: Currently we only support background color for left-to-right text.
+
+ Actor actor;
+
+ Length numberOfGlyphs = textView.GetNumberOfGlyphs();
+ if(numberOfGlyphs > 0u)
+ {
+ Vector<GlyphInfo> glyphs;
+ glyphs.Resize(numberOfGlyphs);
+
+ Vector<Vector2> positions;
+ positions.Resize(numberOfGlyphs);
+
+ // Get the line where the glyphs are laid-out.
+ const LineRun* lineRun = textVisualModel->mLines.Begin();
+ float alignmentOffset = lineRun->alignmentOffset;
+ numberOfGlyphs = textView.GetGlyphs(glyphs.Begin(),
+ positions.Begin(),
+ alignmentOffset,
+ 0u,
+ numberOfGlyphs);
+
+ glyphs.Resize(numberOfGlyphs);
+ positions.Resize(numberOfGlyphs);
+
+ const GlyphInfo* const glyphsBuffer = glyphs.Begin();
+ const Vector2* const positionsBuffer = positions.Begin();
+
+ BackgroundMesh mesh;
+ mesh.mVertices.Reserve(4u * glyphs.Size());
+ mesh.mIndices.Reserve(6u * glyphs.Size());
+
+ const Vector2 textSize = textView.GetLayoutSize();
+
+ const float offsetX = alignmentOffset + textSize.width * 0.5f;
+ const float offsetY = textSize.height * 0.5f;
+
+ const Vector4* const backgroundColorsBuffer = textView.GetBackgroundColors();
+ const ColorIndex* const backgroundColorIndicesBuffer = textView.GetBackgroundColorIndices();
+ const Vector4& defaultBackgroundColor = textVisualModel->IsBackgroundEnabled() ? textVisualModel->GetBackgroundColor() : Color::TRANSPARENT;
+
+ Vector4 quad;
+ uint32_t numberOfQuads = 0u;
+ Length yLineOffset = 0;
+ Length prevLineIndex = 0;
+ LineIndex lineIndex;
+ Length numberOfLines;
+
+ for(uint32_t i = 0, glyphSize = glyphs.Size(); i < glyphSize; ++i)
+ {
+ const GlyphInfo& glyph = *(glyphsBuffer + i);
+
+ // Get the background color of the character.
+ // The color index zero is reserved for the default background color (i.e. Color::TRANSPARENT)
+ const bool isMarkupBackground = textView.IsMarkupBackgroundColorSet();
+ const ColorIndex backgroundColorIndex = isMarkupBackground ? *(backgroundColorIndicesBuffer + i) : 0u;
+ const bool isDefaultBackgroundColor = (0u == backgroundColorIndex);
+ const Vector4& backgroundColor = isDefaultBackgroundColor ? defaultBackgroundColor : *(backgroundColorsBuffer + backgroundColorIndex - 1u);
+
+ textVisualModel->GetNumberOfLines(i, 1, lineIndex, numberOfLines);
+ Length lineHeight = lineRun[lineIndex].ascender + -(lineRun[lineIndex].descender) + lineRun[lineIndex].lineSpacing;
+
+ if(lineIndex != prevLineIndex)
+ {
+ yLineOffset += lineHeight;
+ }
+
+ // Only create quads for glyphs with a background color
+ if(backgroundColor != Color::TRANSPARENT)
+ {
+ const Vector2 position = *(positionsBuffer + i);
+
+ if(i == 0u && glyphSize == 1u) // Only one glyph in the whole text
+ {
+ quad.x = position.x;
+ quad.y = yLineOffset;
+ quad.z = quad.x + std::max(glyph.advance, glyph.xBearing + glyph.width);
+ quad.w = lineHeight;
+ }
+ else if((lineIndex != prevLineIndex) || (i == 0u)) // The first glyph in the line
+ {
+ quad.x = position.x;
+ quad.y = yLineOffset;
+ quad.z = quad.x - glyph.xBearing + glyph.advance;
+ quad.w = quad.y + lineHeight;
+ }
+ else if(i == glyphSize - 1u) // The last glyph in the whole text
+ {
+ quad.x = position.x - glyph.xBearing;
+ quad.y = yLineOffset;
+ quad.z = quad.x + std::max(glyph.advance, glyph.xBearing + glyph.width);
+ quad.w = quad.y + lineHeight;
+ }
+ else // The glyph in the middle of the text
+ {
+ quad.x = position.x - glyph.xBearing;
+ quad.y = yLineOffset;
+ quad.z = quad.x + glyph.advance;
+ quad.w = quad.y + lineHeight;
+ }
+
+ BackgroundVertex vertex;
+
+ // Top left
+ vertex.mPosition.x = quad.x - offsetX;
+ vertex.mPosition.y = quad.y - offsetY;
+ vertex.mColor = backgroundColor;
+ mesh.mVertices.PushBack(vertex);
+
+ // Top right
+ vertex.mPosition.x = quad.z - offsetX;
+ vertex.mPosition.y = quad.y - offsetY;
+ vertex.mColor = backgroundColor;
+ mesh.mVertices.PushBack(vertex);
+
+ // Bottom left
+ vertex.mPosition.x = quad.x - offsetX;
+ vertex.mPosition.y = quad.w - offsetY;
+ vertex.mColor = backgroundColor;
+ mesh.mVertices.PushBack(vertex);
+
+ // Bottom right
+ vertex.mPosition.x = quad.z - offsetX;
+ vertex.mPosition.y = quad.w - offsetY;
+ vertex.mColor = backgroundColor;
+ mesh.mVertices.PushBack(vertex);
+
+ // Six indices in counter clockwise winding
+ mesh.mIndices.PushBack(1u + 4 * numberOfQuads);
+ mesh.mIndices.PushBack(0u + 4 * numberOfQuads);
+ mesh.mIndices.PushBack(2u + 4 * numberOfQuads);
+ mesh.mIndices.PushBack(2u + 4 * numberOfQuads);
+ mesh.mIndices.PushBack(3u + 4 * numberOfQuads);
+ mesh.mIndices.PushBack(1u + 4 * numberOfQuads);
+
+ numberOfQuads++;
+ }
+
+ if(lineIndex != prevLineIndex)
+ {
+ prevLineIndex = lineIndex;
+ }
+ }
+
+ // Only create the background actor if there are glyphs with background color
+ if(mesh.mVertices.Count() > 0u)
+ {
+ Property::Map quadVertexFormat;
+ quadVertexFormat["aPosition"] = Property::VECTOR2;
+ quadVertexFormat["aColor"] = Property::VECTOR4;
+
+ VertexBuffer quadVertices = VertexBuffer::New(quadVertexFormat);
+ quadVertices.SetData(&mesh.mVertices[0], mesh.mVertices.Size());
+
+ Geometry quadGeometry = Geometry::New();
+ quadGeometry.AddVertexBuffer(quadVertices);
+ quadGeometry.SetIndexBuffer(&mesh.mIndices[0], mesh.mIndices.Size());
+
+ if(!textShaderBackground)
+ {
+ textShaderBackground = Shader::New(SHADER_TEXT_CONTROLLER_BACKGROUND_SHADER_VERT, SHADER_TEXT_CONTROLLER_BACKGROUND_SHADER_FRAG);
+ }
+
+ Dali::Renderer renderer = Dali::Renderer::New(quadGeometry, textShaderBackground);
+ renderer.SetProperty(Dali::Renderer::Property::BLEND_MODE, BlendMode::ON);
+ renderer.SetProperty(Dali::Renderer::Property::DEPTH_INDEX, DepthIndex::CONTENT);
+
+ actor = Actor::New();
+ actor.SetProperty(Dali::Actor::Property::NAME, "TextBackgroundColorActor");
+ actor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
+ actor.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
+ actor.SetProperty(Actor::Property::SIZE, textSize);
+ actor.SetProperty(Actor::Property::COLOR_MODE, USE_OWN_MULTIPLY_PARENT_COLOR);
+ actor.AddRenderer(renderer);
+ }
+ }
+
+ return actor;
+}
+
+} // namespace Dali::Toolkit::Text
projects / platform / core / uifw / dali-toolkit.git / commitdiff