2 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #include <dali/internal/text/text-abstraction/cairo-renderer.h>
22 #include <dali/public-api/common/constants.h>
29 #include FT_FREETYPE_H
35 #include <dali/devel-api/text-abstraction/font-client.h>
36 #include <dali/devel-api/text-abstraction/text-renderer-layout-helper.h>
37 #include <dali/integration-api/debug.h>
38 #include <dali/internal/imaging/common/image-operations.h>
39 #include <dali/internal/text/text-abstraction/font-client-impl.h>
44 const float TO_FLOAT = 1.f / 255.f;
45 const float TO_UCHAR = 255.f;
46 const float TWO_PI = 2.f * Dali::Math::PI; ///< 360 degrees in radians
49 * @brief Run of glyphs that have the same style.
54 : fontFace{ nullptr },
60 isItalicRequired{ false },
61 isBoldRequired{ false }
64 FT_Face fontFace; ///< The font face used by the glyphs in the run.
65 double fontSize; ///< The font size used by the glyphs in the run. According the Cairo's documentation this is in user space units. It works if I set the size in pixels.
66 unsigned int glyphIndex; ///< Index to the first glyph of the run.
67 unsigned int numberOfGlyphs; ///< Number of glyphs in the run.
68 unsigned int fontId; ///< The id of the font.
69 unsigned int colorIndex; ///< The index to the color of the glyphs.
70 bool isItalicRequired:1; ///< Whether the italic style is required.
71 bool isBoldRequired:1; ///< Whether the bold style is required.
75 * @brief Helper struct used to destroy a bitmap buffer.
77 * The font client allocates a bitmap's buffer with the new operator.
78 * However, the PixelBuffer class allocates the buffer with the
79 * malloc() function and the Rotate() function which is intended
80 * for the PixelBuffer as well allocates memory with malloc().
82 * This struct keeps the type of allocation and uses the delete[]
83 * operator or the free() function to deallocate resources.
93 GlyphBuffer( Dali::TextAbstraction::FontClient::GlyphBufferData& data, DestructorType type )
110 delete[] data.buffer;
115 Dali::TextAbstraction::FontClient::GlyphBufferData& data;
120 * @brief Creates a pixel buffer with all pixels set to transparent.
122 * @param[in] parameters Contains the width and height of the pixel buffer.
124 * @return The pixel buffer.
126 Dali::Devel::PixelBuffer CreateVoidPixelBuffer( const Dali::TextAbstraction::TextRenderer::Parameters& parameters )
128 Dali::Pixel::Format pixelFormat = parameters.pixelFormat == Dali::TextAbstraction::TextRenderer::Parameters::A8 ? Dali::Pixel::A8 : Dali::Pixel::RGBA8888;
129 Dali::Devel::PixelBuffer pixelBuffer = Dali::Devel::PixelBuffer::New( parameters.width,
133 const unsigned int bufferSize = parameters.width * parameters.height * Dali::Pixel::GetBytesPerPixel( pixelFormat );
134 unsigned char* buffer = pixelBuffer.GetBuffer();
135 memset( buffer, 0, bufferSize );
141 * @brief Wraps the vertices of glyphs laid out on a horizontal strainght line on a circular path.
143 * It copies the vertices from the extra cairo context created to lay out the text
144 * on a horizontal straight line to the cairo context used to render it.
146 * @param[in,out] cr The cairo context used to render the text.
147 * @param[in] circularCr The extra cairo context created to layout horizontal text.
148 * @param[in] parameters The parameters of the circular path.
150 void WrapToCircularPath( cairo_t* cr, cairo_t* circularCr, const Dali::TextAbstraction::CircularTextParameters& parameters )
154 // Copy the path to get a cairo_path_t pointer used to iterate through all its items.
155 std::unique_ptr<cairo_path_t, void(*)(cairo_path_t*)> path( cairo_copy_path( circularCr ), cairo_path_destroy );
157 void ( *transformToArc )( const Dali::TextAbstraction::CircularTextParameters&, double&, double& );
158 transformToArc = parameters.isClockwise ? &Dali::TextAbstraction::TransformToArcClockwise : &Dali::TextAbstraction::TransformToArcAntiClockwise;
160 // Iterates through all the path items and transform each vertex to follow the circle.
161 // Transformed vertices are added to a new path in the 'cr' context (the one used to render the circular text)
162 for( int i = 0; i < path->num_data; i += path->data[i].header.length )
164 cairo_path_data_t* data = &path->data[i];
166 switch( data->header.type )
168 case CAIRO_PATH_MOVE_TO:
172 cairo_new_path( cr );
176 double x = data[1].point.x;
177 double y = data[1].point.y;
178 transformToArc( parameters, x, y );
179 cairo_move_to( cr, x, y );
182 case CAIRO_PATH_LINE_TO:
184 double x = data[1].point.x;
185 double y = data[1].point.y;
186 transformToArc( parameters, x, y );
187 cairo_line_to( cr, x, y );
190 case CAIRO_PATH_CURVE_TO:
192 double x1 = data[1].point.x;
193 double y1 = data[1].point.y;
194 double x2 = data[2].point.x;
195 double y2 = data[2].point.y;
196 double x3 = data[3].point.x;
197 double y3 = data[3].point.y;
198 transformToArc( parameters, x1, y1 );
199 transformToArc( parameters, x2, y2 );
200 transformToArc( parameters, x3, y3 );
201 cairo_curve_to( cr, x1, y1, x2, y2, x3, y3 );
204 case CAIRO_PATH_CLOSE_PATH:
206 cairo_close_path( cr );
211 DALI_LOG_WARNING( "Type of path not handled.\n" );
212 // Nothing else to do.
224 namespace TextAbstraction
230 Devel::PixelBuffer RenderTextCairo( const TextAbstraction::TextRenderer::Parameters& parameters )
232 const unsigned int numberOfGlyphs = parameters.glyphs.Count();
234 if( 0u == numberOfGlyphs )
236 // return a pixel buffer with all pixels set to transparent.
237 return CreateVoidPixelBuffer( parameters );
240 // Convert from DALi glyphs to Cairo glyphs.
241 std::vector<cairo_glyph_t> cairoGlyphs;
242 cairoGlyphs.resize( numberOfGlyphs );
243 cairo_glyph_t* cairoGlyphsBuffer = &cairoGlyphs[0u];
245 const GlyphInfo* const daliGlyphsBuffer = parameters.glyphs.Begin();
246 const Vector2* const positionsBuffer = parameters.positions.Begin();
247 const ColorIndex* const colorIndicesBuffer = ( 0u == parameters.colorIndices.Count() ) ? nullptr : parameters.colorIndices.Begin();
249 for( unsigned index = 0u; index < numberOfGlyphs; ++index )
251 const GlyphInfo& daliGlyph = *( daliGlyphsBuffer + index );
252 const Vector2& position = *( positionsBuffer + index );
253 cairo_glyph_t& cairoGlyph = *( cairoGlyphsBuffer + index );
255 cairoGlyph.index = daliGlyph.index;
256 cairoGlyph.x = std::round( position.x );
257 cairoGlyph.y = std::round( position.y );
260 // Retrieve the FreeType fonts needed by Cairo from the font-client.
261 Dali::TextAbstraction::FontClient fontClient = Dali::TextAbstraction::FontClient::Get();
263 FT_Library ftLibrary;
264 auto error = FT_Init_FreeType(&ftLibrary);
267 DALI_LOG_ERROR( "Error initializing FT library\n" );
268 return CreateVoidPixelBuffer( parameters );
271 // Vector used to store the FreeType font faces, its size and the run of glyphs that use the font.
272 std::vector<GlyphRun> glyphRuns;
273 glyphRuns.reserve( 8u );
275 // The size set in Cairo and FreeType has different units.
276 // Before the size is set in Cairo it needs to be converted according the formula
277 // 'pixel_size = point_size * resolution / 72' got from the FreeType doc.
278 // https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html
280 unsigned int horizontalDpi = 0u;
281 unsigned int verticalDpi = 0u;
282 fontClient.GetDpi( horizontalDpi, verticalDpi );
283 const double dVerticalDpi = static_cast<double>( verticalDpi );
285 const double FROM_26_DOT_6_TO_PIXELS = dVerticalDpi / ( 64.0 * 72.0 );
287 GlyphRun currentGlyphRun;
288 currentGlyphRun.fontId = 0u;
289 currentGlyphRun.colorIndex = 0u;
290 currentGlyphRun.isItalicRequired = false;
291 currentGlyphRun.isBoldRequired = false;
292 for( unsigned index = 0u; index < numberOfGlyphs; ++index )
294 const GlyphInfo& daliGlyph = *( daliGlyphsBuffer + index );
295 const FontId fontId = daliGlyph.fontId;
296 const ColorIndex colorIndex = ( nullptr == colorIndicesBuffer ) ? 0u : *( colorIndicesBuffer + index );
297 const bool isItalicRequired = daliGlyph.isItalicRequired;
298 const bool isBoldRequired = daliGlyph.isBoldRequired;
300 if( ( fontId != currentGlyphRun.fontId ) ||
301 ( ( 0u == fontId ) && ( 0u != daliGlyph.index ) ) ||
302 ( colorIndex != currentGlyphRun.colorIndex ) ||
303 ( isItalicRequired != currentGlyphRun.isItalicRequired ) ||
304 ( isBoldRequired != currentGlyphRun.isBoldRequired ) )
306 // There is a new run. First set the number of glyphs of the previous run and store it.
307 currentGlyphRun.numberOfGlyphs = index - currentGlyphRun.glyphIndex;
308 if( 0u != currentGlyphRun.numberOfGlyphs )
310 glyphRuns.push_back( currentGlyphRun );
313 currentGlyphRun.fontFace = nullptr;
314 currentGlyphRun.fontSize = 0.0;
315 currentGlyphRun.glyphIndex = index;
316 currentGlyphRun.numberOfGlyphs = 0u;
317 currentGlyphRun.fontId = 0u;
318 currentGlyphRun.colorIndex = 0u;
319 currentGlyphRun.isItalicRequired = false;
320 currentGlyphRun.isBoldRequired = false;
324 // Get the font's path file name from the font Id.
325 FontDescription fontDescription;
326 fontClient.GetDescription( fontId, fontDescription );
328 switch( fontDescription.type )
330 case FontDescription::FACE_FONT:
332 // Create a FreeType font's face.
333 error = FT_New_Face( ftLibrary, fontDescription.path.c_str(), 0u, ¤tGlyphRun.fontFace );
336 DALI_LOG_ERROR( "Error in FT while creating new face\n" );
337 return CreateVoidPixelBuffer( parameters );
340 // Set the font's size. It needs to be set in the Freetype font and in the Cairo's context.
341 unsigned int fontSize = fontClient.GetPointSize( fontId );
343 // Font's size to be set in the Cairo's context.
344 currentGlyphRun.fontSize = FROM_26_DOT_6_TO_PIXELS * static_cast<double>( fontSize );
347 case FontDescription::BITMAP_FONT:
359 currentGlyphRun.fontId = fontId;
360 currentGlyphRun.colorIndex = colorIndex;
361 currentGlyphRun.isItalicRequired = isItalicRequired;
362 currentGlyphRun.isBoldRequired = isBoldRequired;
366 // Calculate the number of glyphs of the last run and store it.
367 currentGlyphRun.numberOfGlyphs = numberOfGlyphs - currentGlyphRun.glyphIndex;
368 if( 0u != currentGlyphRun.numberOfGlyphs )
370 glyphRuns.push_back( currentGlyphRun );
373 // Choose the pixel format to be used.
375 // @note Behdad wrote "Upper 8 bits maps to the fourth byte in a little-endian machine like the intels."
376 // https://lists.cairographics.org/archives/cairo/2006-March/006563.html
378 // Here in practice Cairo's ARGB32 is like DALi's RGBA8888.
380 const bool isDstRgba = TextAbstraction::TextRenderer::Parameters::RGBA8888 == parameters.pixelFormat;
381 const Pixel::Format pixelFormat = isDstRgba ? Pixel::Format::RGBA8888 : Pixel::Format::A8;
382 const cairo_format_t cairoFormat = isDstRgba ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_A8;
384 // This function provides a stride value that will respect all alignment requirements of the
385 // accelerated image-rendering code within cairo.
386 const int stride = cairo_format_stride_for_width( cairoFormat,
387 static_cast<int>( parameters.width ) );
388 const int strideWidth = stride / Pixel::GetBytesPerPixel( pixelFormat );
390 // Creates the pixel buffer and retrieves the buffer pointer used to create the Cairo's surface.
391 Devel::PixelBuffer pixelBuffer = Devel::PixelBuffer::New( strideWidth, parameters.height, pixelFormat );
393 unsigned char* buffer = pixelBuffer.GetBuffer();
394 const unsigned int bufferSize = stride * parameters.height;
395 memset( buffer, 0, bufferSize );
397 std::unique_ptr<cairo_surface_t, void(*)(cairo_surface_t*)> surfacePtr( cairo_image_surface_create_for_data( buffer,
402 cairo_surface_destroy );
403 cairo_surface_t* surface = surfacePtr.get();
405 if( ( nullptr == surface ) || ( CAIRO_STATUS_SUCCESS != cairo_surface_status( surface ) ) )
407 DALI_LOG_ERROR( "Failed to create a cairo's surface\n" );
409 return CreateVoidPixelBuffer( parameters );
412 // Whether the text is circular.
413 const bool isCircularText = 0u != parameters.radius;
415 // Creates a surface for circular text.
417 // The reason to create a surface for circular text is that the strategy
418 // followed is to layout the text in a straight horizontal line and apply a
419 // transform to each vertex that forms the geometry of the glyphs to place
420 // and bend the glyphs accordingly to the circular path.
422 // As the glyphs are laid out first in a straight line they may exceed the
423 // boundaries of the surface in that case cairo ignores them.
424 std::unique_ptr<cairo_surface_t, void(*)(cairo_surface_t*)> circularSurfacePtr( nullptr, cairo_surface_destroy );
425 cairo_surface_t* circularSurface = nullptr;
428 circularSurfacePtr.reset( cairo_surface_create_similar( surface,
430 parameters.circularWidth,
431 parameters.circularHeight ) );
432 circularSurface = circularSurfacePtr.get();
434 if( ( nullptr == circularSurface ) || ( CAIRO_STATUS_SUCCESS != cairo_surface_status( circularSurface ) ) )
436 DALI_LOG_ERROR( "Failed to create a cairo's circular surface\n" );
438 return CreateVoidPixelBuffer( parameters );
442 std::unique_ptr<cairo_t, void(*)(cairo_t*)> crPtr( cairo_create( surface ), cairo_destroy );
443 cairo_t* cr = crPtr.get();
445 if( CAIRO_STATUS_SUCCESS != cairo_status( cr ) )
447 DALI_LOG_ERROR( "Failed to create a cairo context\n" );
449 return CreateVoidPixelBuffer( parameters );
452 std::unique_ptr<cairo_t, void(*)(cairo_t*)> circularCrPtr( nullptr, cairo_destroy );
453 cairo_t* circularCr = nullptr;
457 circularCrPtr.reset( cairo_create( circularSurface ) );
458 circularCr = circularCrPtr.get();
460 if( CAIRO_STATUS_SUCCESS != cairo_status( circularCr ) )
462 DALI_LOG_ERROR( "Failed to create a cairo context\n" );
464 return CreateVoidPixelBuffer( parameters );
468 CircularTextParameters circularTextParameters;
470 // Render the glyphs.
473 // Set the parameters.
474 circularTextParameters.isClockwise = ( TextAbstraction::TextRenderer::Parameters::CLOCKWISE == parameters.circularLayout );
476 circularTextParameters.centerX = static_cast<double>( parameters.centerX );
477 circularTextParameters.centerY = static_cast<double>( parameters.centerY );
478 circularTextParameters.radius = static_cast<double>( parameters.radius );
479 circularTextParameters.invRadius = 1.0 / circularTextParameters.radius;
480 circularTextParameters.beginAngle = -parameters.beginAngle + Dali::Math::PI_2;
483 cairo_move_to( cr, 0.0, 0.0 );
485 for( const auto& run: glyphRuns )
487 const bool isEmoji = parameters.isEmoji[run.glyphIndex];
488 if( isEmoji || ( nullptr == run.fontFace ) )
490 // Retrieve the color for the glyph.
491 const Vector4& color = parameters.colors[run.colorIndex];
493 const unsigned int lastGlyphIndex = run.glyphIndex + run.numberOfGlyphs;
494 for( unsigned int index = run.glyphIndex; index < lastGlyphIndex; ++index )
496 // Whether it's a bitmap font.
497 const bool doBlendWithTextColor = !isEmoji && ( ColorBlendingMode::MULTIPLY == parameters.blendingMode[index] );
499 // Check if there is an embedded image or a bitmap font image.
500 const GlyphIndex glyphFontIndex = daliGlyphsBuffer[index].index;
501 if( 0u != glyphFontIndex )
503 // The embedded image could be A8, RGBA8888 or BGRA8888.
505 // If the embedded image is RGBA8888 or BGRA8888 then the cairo's buffer is ARGB32. It's needed to convert from RGBA or BGRA to ARGB.
506 // If the embedded image is A8 it's needed to check if the cairo's buffer is A8 or ARGB32 and do the conversion if needed.
508 const cairo_glyph_t& glyph = *( cairoGlyphsBuffer + index );
510 // Retrieve the image
511 TextAbstraction::FontClient::GlyphBufferData data;
512 std::unique_ptr<GlyphBuffer> glyphBufferPtr( new GlyphBuffer( data, GlyphBuffer::DELETE ) );
515 data.width = parameters.glyphs[run.glyphIndex].width;
516 data.height = parameters.glyphs[run.glyphIndex].height;
519 fontClient.CreateBitmap( run.fontId, glyphFontIndex, false, false, data, 0u );
521 if( nullptr == data.buffer )
523 // nothing else to do if there is no image.
527 // Calculate the position for the circular text.
528 double glyphX = glyph.x;
529 double glyphY = glyph.y;
533 // Center of the bitmap.
534 const double halfWidth = 0.5 * static_cast<double>( data.width );
535 const double halfHeight = 0.5 * static_cast<double>( data.height );
537 double centerX = glyph.x + halfWidth;
538 double centerY = glyph.y - halfHeight;
540 float radians = circularTextParameters.beginAngle + ( circularTextParameters.isClockwise ? -1.f : 1.f ) * ( Dali::Math::PI_2 + circularTextParameters.invRadius * centerX );
541 radians = fmod( radians, TWO_PI );
542 radians += ( radians < 0.f ) ? TWO_PI : 0.f;
544 void ( *transformToArc )( const CircularTextParameters&, double&, double& );
545 transformToArc = circularTextParameters.isClockwise ? &TransformToArcClockwise : &TransformToArcAntiClockwise;
547 transformToArc( circularTextParameters, centerX, centerY );
549 uint8_t* pixelsOut = nullptr;
550 unsigned int widthOut = data.width;
551 unsigned int heightOut = data.height;
552 const unsigned int pixelSize = Pixel::GetBytesPerPixel( data.format );
554 Dali::Internal::Platform::RotateByShear( data.buffer,
562 if( nullptr != pixelsOut )
564 delete[] data.buffer;
565 data.buffer = pixelsOut;
566 glyphBufferPtr.get()->type = GlyphBuffer::FREE;
567 data.width = widthOut;
568 data.height = heightOut;
571 glyphX = centerX - 0.5 * static_cast<double>( data.width );
572 glyphY = centerY + 0.5 * static_cast<double>( data.height );
576 if( ( Pixel::A8 != data.format ) &&
577 ( Pixel::L8 != data.format ) &&
578 ( Pixel::RGBA8888 != data.format ) &&
579 ( Pixel::BGRA8888 != data.format ) )
581 DALI_LOG_ERROR( " Cairo Renderer: The valid pixel format for embedded items are A8 or RGBA8888\n" );
585 // Check if the item is out of the buffer.
586 if( ( glyphX + static_cast<float>( data.width ) < 0.f ) ||
587 ( glyphX > static_cast<float>( strideWidth ) ) ||
589 ( glyphY - static_cast<float>( data.height ) > static_cast<float>( parameters.height ) ) )
591 // The embedded item is completely out of the buffer.
595 const bool isSrcA = ( Pixel::A8 == data.format ) || ( Pixel::L8 == data.format );
596 const bool isSrcRgba = Pixel::RGBA8888 == data.format;
597 const bool isSrcBgra = Pixel::BGRA8888 == data.format;
599 // 0 -> image and cairo buffer are A8
600 // 1 -> image is A8, cairo buffer is ARGB
601 // 2 -> image is RGBA and cairo buffer is ARGB
602 // 3 -> image is BGRA and cairo buffer is ARGB
604 if( isSrcA && isDstRgba )
608 else if( isSrcRgba && isDstRgba )
612 else if( isSrcBgra && isDstRgba )
616 else if( ( isSrcRgba || isSrcBgra ) && !isDstRgba )
618 DALI_LOG_ERROR( "Cairo Renderer: The embedded image is RGBA or BGRA and the Cairo's buffer has been creates with A8 format!\n" );
622 // Select the cropped source image area to copy into the surface buffer
623 unsigned int glyphUintX = 0u;
624 unsigned int glyphUintY = 0u;
625 unsigned int srcWidth = data.width;
626 unsigned int srcHeight = data.height;
627 unsigned int xSrcIndex = 0u;
628 unsigned int ySrcIndex = 0u;
631 xSrcIndex = static_cast<unsigned int>( std::abs( glyphX ) );
632 srcWidth -= xSrcIndex;
636 glyphUintX = static_cast<unsigned int>( glyphX );
639 if( glyphUintX + srcWidth > static_cast<unsigned int>( strideWidth ) )
641 srcWidth -= ( ( glyphUintX + srcWidth ) - strideWidth );
644 if( glyphY - static_cast<float>( srcHeight ) < 0.f )
646 ySrcIndex = static_cast<unsigned int>( std::abs( glyphY - static_cast<float>( srcHeight ) ) );
647 srcHeight -= ySrcIndex;
651 glyphUintY = static_cast<unsigned int>( glyphY - static_cast<float>( srcHeight ) );
654 if( glyphUintY + srcHeight > parameters.height )
656 srcHeight -= ( ( glyphUintY + srcHeight ) - parameters.height );
659 // Calculate the source and destination indices.
660 const unsigned int srcPixelSize = Pixel::GetBytesPerPixel( data.format );
661 const unsigned int dstPixelSize = Pixel::GetBytesPerPixel( pixelFormat );
663 unsigned int srcIndex = srcPixelSize * ( ySrcIndex * srcWidth + xSrcIndex );
664 unsigned int dstIndex = dstPixelSize * ( glyphUintY * strideWidth + glyphUintX );
666 const unsigned int srcWidthOffset = srcPixelSize * ( data.width - srcWidth );
667 const unsigned int dstWidthOffset = dstPixelSize * ( strideWidth - srcWidth );
669 // Copy the image to the surface
670 for( unsigned int j = 0; j < srcHeight; ++j )
672 for( unsigned int i = 0; i < srcWidth; ++i )
676 case 0: // Both the image's buffer and cairo's buffer are A8
678 const unsigned char alpha = *( data.buffer + srcIndex );
681 // @todo needs a proper blending!
682 *( buffer + dstIndex ) = alpha;
686 case 1: // The image's buffer is A8 and the cairo's buffer is ARGB
688 const unsigned char alpha = *( data.buffer + srcIndex );
691 // @todo needs a proper blending!
692 const float srcAlpha = TO_FLOAT * static_cast<float>( alpha );
694 // Write the RGBA modulated with the given default color.
695 const float* const colorPtr = color.AsFloat();
696 *( buffer + dstIndex + 0u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[0u] * srcAlpha );
697 *( buffer + dstIndex + 1u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[1u] * srcAlpha );
698 *( buffer + dstIndex + 2u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[2u] * srcAlpha );
699 *( buffer + dstIndex + 3u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[3u] * srcAlpha );
703 case 2: // The image's buffer is RGBA and the cairo's buffer is ARGB
705 const unsigned char alpha = *(data.buffer + srcIndex + 3u);
708 if( doBlendWithTextColor )
710 const float* const colorPtr = color.AsFloat();
712 const float srcAlpha = TO_FLOAT * static_cast<float>(alpha) * colorPtr[3u];
714 *(buffer + dstIndex + 0u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 0u) ) * colorPtr[0u] );
715 *(buffer + dstIndex + 1u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 1u) ) * colorPtr[1u] );
716 *(buffer + dstIndex + 2u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 2u) ) * colorPtr[2u] );
719 *(buffer + dstIndex + 3u) = static_cast<unsigned char>( TO_UCHAR * srcAlpha );
723 // @todo needs a proper blending!
725 *(buffer + dstIndex + 0u) = *(data.buffer + srcIndex + 0u);
726 *(buffer + dstIndex + 1u) = *(data.buffer + srcIndex + 1u);
727 *(buffer + dstIndex + 2u) = *(data.buffer + srcIndex + 2u);
730 *(buffer + dstIndex + 3u) = *(data.buffer + srcIndex + 3u);
735 case 3: // The image's buffer is BGRA and the cairo's buffer is ARGB
737 const unsigned char alpha = *(data.buffer + srcIndex + 3u);
740 if( doBlendWithTextColor )
742 const float* const colorPtr = color.AsFloat();
744 const float srcAlpha = TO_FLOAT * static_cast<float>(alpha) * colorPtr[3u];
746 *(buffer + dstIndex + 0u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 2u) ) * colorPtr[0u] );
747 *(buffer + dstIndex + 1u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 1u) ) * colorPtr[1u] );
748 *(buffer + dstIndex + 2u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 0u) ) * colorPtr[2u] );
751 *(buffer + dstIndex + 3u) = static_cast<unsigned char>( TO_UCHAR * srcAlpha );
755 // @todo needs a proper blending!
757 *(buffer + dstIndex + 0u) = *(data.buffer + srcIndex + 2u);
758 *(buffer + dstIndex + 1u) = *(data.buffer + srcIndex + 1u);
759 *(buffer + dstIndex + 2u) = *(data.buffer + srcIndex + 0u);
760 *(buffer + dstIndex + 3u) = *(data.buffer + srcIndex + 3u);
767 DALI_ASSERT_ALWAYS( !"Cairo Renderer: The accepted values for this switch case are: 0, 1, 2!" );
770 srcIndex += srcPixelSize;
771 dstIndex += dstPixelSize;
773 srcIndex += srcWidthOffset;
774 dstIndex += dstWidthOffset;
781 // Sets the color. The color is actually BGRA
782 const Vector4& color = parameters.colors[run.colorIndex];
784 cairo_set_source_rgba( cr,
785 static_cast<double>( color.b ),
786 static_cast<double>( color.g ),
787 static_cast<double>( color.r ),
788 static_cast<double>( color.a ) );
790 // Create the Cairo's font from the FreeType font.
791 std::unique_ptr<cairo_font_face_t, void(*)(cairo_font_face_t*)> fontFacePtr( cairo_ft_font_face_create_for_ft_face( run.fontFace, 0 ), cairo_font_face_destroy );
792 cairo_font_face_t* fontFace = fontFacePtr.get();
794 static const cairo_user_data_key_t key = { 0 };
795 cairo_status_t status = cairo_font_face_set_user_data( fontFace, &key, run.fontFace, reinterpret_cast<cairo_destroy_func_t>( FT_Done_Face ) );
798 cairo_font_face_destroy(fontFace);
801 unsigned int ftSynthesizeFlag = 0u;
802 if( run.isBoldRequired && !( run.fontFace->style_flags & FT_STYLE_FLAG_BOLD ) )
804 ftSynthesizeFlag |= CAIRO_FT_SYNTHESIZE_BOLD;
807 cairo_ft_font_face_set_synthesize( fontFace, ftSynthesizeFlag );
809 cairo_font_face_reference( fontFace );
811 const bool synthesizeItalic = ( run.isItalicRequired && !( run.fontFace->style_flags & FT_STYLE_FLAG_ITALIC ) );
813 if( CAIRO_STATUS_SUCCESS != cairo_font_face_status( fontFace ) )
815 DALI_LOG_ERROR( "Failed to load the Freetype Font\n" );
819 cairo_set_font_face( isCircularText ? circularCr : cr, fontFace );
822 cairo_set_font_size( isCircularText ? circularCr : cr, run.fontSize );
824 // Render the glyphs.
827 // Create a new path where the text is laid out on a horizontal straight line.
828 cairo_new_path( circularCr );
829 cairo_move_to( circularCr, 0.0, 0.0 );
831 cairo_glyph_path( circularCr, ( cairoGlyphsBuffer + run.glyphIndex ), run.numberOfGlyphs );
832 WrapToCircularPath( cr, circularCr, circularTextParameters );
836 if( synthesizeItalic )
838 // Apply a shear transform to synthesize the italics.
839 // For a reason Cairo may trim some glyphs if the CAIRO_FT_SYNTHESIZE_OBLIQUE flag is used.
841 // This is to calculate an offset used to compensate the 'translation' done by the shear transform
842 // as it's done for the whole render buffer.
844 for( unsigned int index = run.glyphIndex, endIndex = run.glyphIndex + run.numberOfGlyphs; index < endIndex; ++index )
846 maxY = std::max( maxY, (*( cairoGlyphsBuffer + index )).y );
849 cairo_matrix_t matrix;
850 cairo_matrix_init( &matrix,
852 -TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE, 1.0,
853 maxY * TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE, 0.0 );
855 cairo_transform( cr, &matrix );
858 cairo_show_glyphs( cr, ( cairoGlyphsBuffer + run.glyphIndex ), run.numberOfGlyphs );
860 if( synthesizeItalic )
862 // Restore the transform matrix to the identity.
863 cairo_matrix_t matrix;
864 cairo_matrix_init_identity( &matrix );
865 cairo_set_matrix( cr, &matrix );
875 } // namespace Internal
877 } // namespace TextAbstraction