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| 1 | +/* |
| 2 | + * This source file is part of RmlUi, the HTML/CSS Interface Middleware |
| 3 | + * |
| 4 | + * For the latest information, see http://github.com/mikke89/RmlUi |
| 5 | + * |
| 6 | + * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd |
| 7 | + * Copyright (c) 2019-2024 The RmlUi Team, and contributors |
| 8 | + * |
| 9 | + * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 10 | + * of this software and associated documentation files (the "Software"), to deal |
| 11 | + * in the Software without restriction, including without limitation the rights |
| 12 | + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 13 | + * copies of the Software, and to permit persons to whom the Software is |
| 14 | + * furnished to do so, subject to the following conditions: |
| 15 | + * |
| 16 | + * The above copyright notice and this permission notice shall be included in |
| 17 | + * all copies or substantial portions of the Software. |
| 18 | + * |
| 19 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 20 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 21 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 22 | + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 23 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 24 | + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 25 | + * THE SOFTWARE. |
| 26 | + * |
| 27 | + */ |
| 28 | + |
| 29 | +#include "DecoratorText.h" |
| 30 | +#include "../../Include/RmlUi/Core/ComputedValues.h" |
| 31 | +#include "../../Include/RmlUi/Core/Context.h" |
| 32 | +#include "../../Include/RmlUi/Core/Element.h" |
| 33 | +#include "../../Include/RmlUi/Core/FontEngineInterface.h" |
| 34 | +#include "../../Include/RmlUi/Core/Geometry.h" |
| 35 | +#include "../../Include/RmlUi/Core/PropertyDefinition.h" |
| 36 | +#include "../../Include/RmlUi/Core/RenderManager.h" |
| 37 | +#include "../../Include/RmlUi/Core/TextShapingContext.h" |
| 38 | + |
| 39 | +namespace Rml { |
| 40 | + |
| 41 | +DecoratorText::DecoratorText() {} |
| 42 | + |
| 43 | +DecoratorText::~DecoratorText() {} |
| 44 | + |
| 45 | +void DecoratorText::Initialise(String in_text, bool in_inherit_color, Colourb in_color, Vector2Numeric in_align) |
| 46 | +{ |
| 47 | + text = std::move(in_text); |
| 48 | + inherit_color = in_inherit_color; |
| 49 | + color = in_color; |
| 50 | + align = in_align; |
| 51 | +} |
| 52 | + |
| 53 | +DecoratorDataHandle DecoratorText::GenerateElementData(Element* element, BoxArea paint_area) const |
| 54 | +{ |
| 55 | + ElementData* data = new ElementData{paint_area, {}, -1}; |
| 56 | + |
| 57 | + if (!GenerateGeometry(element, *data)) |
| 58 | + { |
| 59 | + Log::Message(Log::LT_WARNING, "Could not construct text decorator with text %s on element %s", text.c_str(), element->GetAddress().c_str()); |
| 60 | + return {}; |
| 61 | + } |
| 62 | + |
| 63 | + return reinterpret_cast<DecoratorDataHandle>(data); |
| 64 | +} |
| 65 | + |
| 66 | +void DecoratorText::ReleaseElementData(DecoratorDataHandle element_data) const |
| 67 | +{ |
| 68 | + delete reinterpret_cast<ElementData*>(element_data); |
| 69 | +} |
| 70 | + |
| 71 | +void DecoratorText::RenderElement(Element* element, DecoratorDataHandle element_data) const |
| 72 | +{ |
| 73 | + ElementData* data = reinterpret_cast<ElementData*>(element_data); |
| 74 | + if (!GenerateGeometry(element, *data)) |
| 75 | + return; |
| 76 | + |
| 77 | + const Vector2f translation = element->GetAbsoluteOffset(BoxArea::Border); |
| 78 | + |
| 79 | + for (size_t i = 0; i < data->textured_geometry.size(); ++i) |
| 80 | + data->textured_geometry[i].geometry.Render(translation, data->textured_geometry[i].texture); |
| 81 | +} |
| 82 | + |
| 83 | +bool DecoratorText::GenerateGeometry(Element* element, ElementData& element_data) const |
| 84 | +{ |
| 85 | + FontFaceHandle font_face_handle = element->GetFontFaceHandle(); |
| 86 | + if (font_face_handle == 0) |
| 87 | + return false; |
| 88 | + |
| 89 | + FontEngineInterface* font_engine_interface = GetFontEngineInterface(); |
| 90 | + const int new_version = font_engine_interface->GetVersion(font_face_handle); |
| 91 | + if (new_version == element_data.font_handle_version) |
| 92 | + return true; |
| 93 | + |
| 94 | + const auto& computed = element->GetComputedValues(); |
| 95 | + const TextShapingContext text_shaping_context{computed.language(), computed.direction(), computed.letter_spacing()}; |
| 96 | + |
| 97 | + const int string_width = font_engine_interface->GetStringWidth(font_face_handle, text, text_shaping_context); |
| 98 | + |
| 99 | + const FontMetrics& metrics = font_engine_interface->GetFontMetrics(font_face_handle); |
| 100 | + const RenderBox render_box = element->GetRenderBox(element_data.paint_area); |
| 101 | + const Vector2f text_size = {float(string_width), metrics.ascent + metrics.descent}; |
| 102 | + const Vector2f offset_to_align_area = render_box.GetFillOffset() + Vector2f{0, metrics.ascent}; |
| 103 | + const Vector2f size_of_align_area = render_box.GetFillSize() - text_size; |
| 104 | + const Vector2f offset_within_align_area = |
| 105 | + Vector2f{element->ResolveNumericValue(align.x, size_of_align_area.x), element->ResolveNumericValue(align.y, size_of_align_area.y)}; |
| 106 | + |
| 107 | + const Vector2f offset = offset_to_align_area + offset_within_align_area; |
| 108 | + const float opacity = computed.opacity(); |
| 109 | + const ColourbPremultiplied text_color = (inherit_color ? computed.color() : color).ToPremultiplied(opacity); |
| 110 | + |
| 111 | + RenderManager& render_manager = element->GetContext()->GetRenderManager(); |
| 112 | + TexturedMeshList mesh_list; |
| 113 | + font_engine_interface->GenerateString(render_manager, font_face_handle, {}, text, offset, text_color, opacity, text_shaping_context, mesh_list); |
| 114 | + |
| 115 | + if (mesh_list.empty()) |
| 116 | + return false; |
| 117 | + |
| 118 | + Vector<TexturedGeometry> textured_geometry(mesh_list.size()); |
| 119 | + for (size_t i = 0; i < textured_geometry.size(); i++) |
| 120 | + { |
| 121 | + textured_geometry[i].geometry = render_manager.MakeGeometry(std::move(mesh_list[i].mesh)); |
| 122 | + textured_geometry[i].texture = mesh_list[i].texture; |
| 123 | + } |
| 124 | + |
| 125 | + element_data = ElementData{ |
| 126 | + element_data.paint_area, |
| 127 | + std::move(textured_geometry), |
| 128 | + font_engine_interface->GetVersion(font_face_handle), |
| 129 | + }; |
| 130 | + |
| 131 | + return true; |
| 132 | +} |
| 133 | + |
| 134 | +DecoratorTextInstancer::DecoratorTextInstancer() |
| 135 | +{ |
| 136 | + ids = {}; |
| 137 | + ids.text = RegisterProperty("text", "").AddParser("string").GetId(); |
| 138 | + ids.color = RegisterProperty("color", "inherit-color").AddParser("keyword", "inherit-color").AddParser("color").GetId(); |
| 139 | + ids.align_x = RegisterProperty("align-x", "center").AddParser("keyword", "left, center, right").AddParser("length_percent").GetId(); |
| 140 | + ids.align_y = RegisterProperty("align-y", "center").AddParser("keyword", "top, center, bottom").AddParser("length_percent").GetId(); |
| 141 | + |
| 142 | + RegisterShorthand("decorator", "text, color, align-x, align-y, align-x", ShorthandType::FallThrough); |
| 143 | +} |
| 144 | + |
| 145 | +DecoratorTextInstancer::~DecoratorTextInstancer() {} |
| 146 | + |
| 147 | +SharedPtr<Decorator> DecoratorTextInstancer::InstanceDecorator(const String& /*name*/, const PropertyDictionary& properties, |
| 148 | + const DecoratorInstancerInterface& /*instancer_interface*/) |
| 149 | +{ |
| 150 | + const Property* p_text = properties.GetProperty(ids.text); |
| 151 | + const Property* p_color = properties.GetProperty(ids.color); |
| 152 | + Array<const Property*, 2> p_align = {properties.GetProperty(ids.align_x), properties.GetProperty(ids.align_y)}; |
| 153 | + if (!p_text || !p_color || !p_align[0] || !p_align[1]) |
| 154 | + return nullptr; |
| 155 | + |
| 156 | + String text = StringUtilities::DecodeRml(p_text->Get<String>()); |
| 157 | + if (text.empty()) |
| 158 | + return nullptr; |
| 159 | + |
| 160 | + const bool inherit_color = (p_color->unit == Unit::KEYWORD); |
| 161 | + const Colourb color = (p_color->unit == Unit::COLOUR ? p_color->Get<Colourb>() : Colourb{}); |
| 162 | + const Vector2Numeric align = ComputePosition(p_align); |
| 163 | + |
| 164 | + auto decorator = MakeShared<DecoratorText>(); |
| 165 | + decorator->Initialise(std::move(text), inherit_color, color, align); |
| 166 | + return decorator; |
| 167 | +} |
| 168 | + |
| 169 | +} // namespace Rml |
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