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1f8a42c367
The verified pixel output in this test just reflects currently observed behavior, I have not verified that all cases output the correct data wrt what the spec expects.
241 lines
8.2 KiB
C++
241 lines
8.2 KiB
C++
/*
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* Copyright (c) 2023-2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/ImmutableBitmap.h>
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#include <LibGfx/PaintingSurface.h>
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#include <LibGfx/SkiaUtils.h>
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#include <core/SkBitmap.h>
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#include <core/SkCanvas.h>
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#include <core/SkColorSpace.h>
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#include <core/SkImage.h>
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#include <core/SkSurface.h>
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namespace Gfx {
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StringView export_format_name(ExportFormat format)
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{
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switch (format) {
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#define ENUMERATE_EXPORT_FORMAT(format) \
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case Gfx::ExportFormat::format: \
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return #format##sv;
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ENUMERATE_EXPORT_FORMATS(ENUMERATE_EXPORT_FORMAT)
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#undef ENUMERATE_EXPORT_FORMAT
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}
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VERIFY_NOT_REACHED();
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}
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struct ImmutableBitmapImpl {
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sk_sp<SkImage> sk_image;
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SkBitmap sk_bitmap;
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Variant<NonnullRefPtr<Gfx::Bitmap>, NonnullRefPtr<Gfx::PaintingSurface>, Empty> source;
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ColorSpace color_space;
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};
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int ImmutableBitmap::width() const
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{
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return m_impl->sk_image->width();
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}
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int ImmutableBitmap::height() const
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{
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return m_impl->sk_image->height();
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}
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IntRect ImmutableBitmap::rect() const
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{
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return { {}, size() };
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}
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IntSize ImmutableBitmap::size() const
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{
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return { width(), height() };
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}
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AlphaType ImmutableBitmap::alpha_type() const
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{
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// We assume premultiplied alpha type for opaque surfaces since that is Skia's preferred alpha type and the
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// effective pixel data is identical between premultiplied and unpremultiplied in that case.
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return m_impl->sk_image->alphaType() == kUnpremul_SkAlphaType ? AlphaType::Unpremultiplied : AlphaType::Premultiplied;
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}
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SkImage const* ImmutableBitmap::sk_image() const
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{
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return m_impl->sk_image.get();
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}
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static int bytes_per_pixel_for_export_format(ExportFormat format)
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{
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switch (format) {
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case ExportFormat::Gray8:
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case ExportFormat::Alpha8:
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return 1;
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case ExportFormat::RGB565:
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case ExportFormat::RGBA5551:
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case ExportFormat::RGBA4444:
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return 2;
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case ExportFormat::RGB888:
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return 3;
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case ExportFormat::RGBA8888:
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return 4;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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static SkColorType export_format_to_skia_color_type(ExportFormat format)
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{
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switch (format) {
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case ExportFormat::Gray8:
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return SkColorType::kGray_8_SkColorType;
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case ExportFormat::Alpha8:
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return SkColorType::kAlpha_8_SkColorType;
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case ExportFormat::RGB565:
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return SkColorType::kRGB_565_SkColorType;
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case ExportFormat::RGBA5551:
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dbgln("FIXME: Support conversion to RGBA5551.");
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return SkColorType::kUnknown_SkColorType;
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case ExportFormat::RGBA4444:
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return SkColorType::kARGB_4444_SkColorType;
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case ExportFormat::RGB888:
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// This one needs to be converted manually because Skia has no valid 24-bit color type.
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VERIFY_NOT_REACHED();
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case ExportFormat::RGBA8888:
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return SkColorType::kRGBA_8888_SkColorType;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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ErrorOr<BitmapExportResult> ImmutableBitmap::export_to_byte_buffer(ExportFormat format, int flags, Optional<int> target_width, Optional<int> target_height) const
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{
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int width = target_width.value_or(this->width());
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int height = target_height.value_or(this->height());
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if (format == ExportFormat::RGB888 && (width != this->width() || height != this->height())) {
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dbgln("FIXME: Ignoring target width and height because scaling is not implemented for this export format.");
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width = this->width();
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height = this->height();
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}
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Checked<size_t> buffer_pitch = width;
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int number_of_bytes = bytes_per_pixel_for_export_format(format);
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buffer_pitch *= number_of_bytes;
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if (buffer_pitch.has_overflow())
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return Error::from_string_literal("Gfx::ImmutableBitmap::export_to_byte_buffer size overflow");
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if (Checked<size_t>::multiplication_would_overflow(buffer_pitch.value(), height))
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return Error::from_string_literal("Gfx::ImmutableBitmap::export_to_byte_buffer size overflow");
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auto buffer = MUST(ByteBuffer::create_zeroed(buffer_pitch.value() * height));
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if (width > 0 && height > 0) {
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if (format == ExportFormat::RGB888) {
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// 24 bit RGB is not supported by Skia, so we need to handle this format ourselves.
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auto raw_buffer = buffer.data();
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for (auto y = 0; y < height; y++) {
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auto target_y = flags & ExportFlags::FlipY ? height - y - 1 : y;
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for (auto x = 0; x < width; x++) {
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auto pixel = get_pixel(x, y);
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auto buffer_offset = (target_y * buffer_pitch.value()) + (x * 3ull);
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raw_buffer[buffer_offset + 0] = pixel.red();
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raw_buffer[buffer_offset + 1] = pixel.green();
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raw_buffer[buffer_offset + 2] = pixel.blue();
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}
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}
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} else {
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auto skia_format = export_format_to_skia_color_type(format);
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auto color_space = SkColorSpace::MakeSRGB();
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auto image_info = SkImageInfo::Make(width, height, skia_format, flags & ExportFlags::PremultiplyAlpha ? SkAlphaType::kPremul_SkAlphaType : SkAlphaType::kUnpremul_SkAlphaType, color_space);
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auto surface = SkSurfaces::WrapPixels(image_info, buffer.data(), buffer_pitch.value());
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VERIFY(surface);
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auto* surface_canvas = surface->getCanvas();
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auto dst_rect = Gfx::to_skia_rect(Gfx::Rect { 0, 0, width, height });
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if (flags & ExportFlags::FlipY) {
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surface_canvas->translate(0, dst_rect.height());
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surface_canvas->scale(1, -1);
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}
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surface_canvas->drawImageRect(sk_image(), dst_rect, Gfx::to_skia_sampling_options(Gfx::ScalingMode::NearestNeighbor));
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}
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} else {
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VERIFY(buffer.is_empty());
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}
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return BitmapExportResult {
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.buffer = move(buffer),
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.width = width,
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.height = height,
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};
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}
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RefPtr<Gfx::Bitmap const> ImmutableBitmap::bitmap() const
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{
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// FIXME: Implement for PaintingSurface
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return m_impl->source.get<NonnullRefPtr<Gfx::Bitmap>>();
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}
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Color ImmutableBitmap::get_pixel(int x, int y) const
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{
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// FIXME: Implement for PaintingSurface
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return m_impl->source.get<NonnullRefPtr<Gfx::Bitmap>>()->get_pixel(x, y);
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}
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static SkAlphaType to_skia_alpha_type(Gfx::AlphaType alpha_type)
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{
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switch (alpha_type) {
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case AlphaType::Premultiplied:
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return kPremul_SkAlphaType;
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case AlphaType::Unpremultiplied:
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return kUnpremul_SkAlphaType;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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NonnullRefPtr<ImmutableBitmap> ImmutableBitmap::create(NonnullRefPtr<Bitmap> bitmap, ColorSpace color_space)
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{
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ImmutableBitmapImpl impl;
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auto info = SkImageInfo::Make(bitmap->width(), bitmap->height(), to_skia_color_type(bitmap->format()), to_skia_alpha_type(bitmap->alpha_type()), color_space.color_space<sk_sp<SkColorSpace>>());
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impl.sk_bitmap.installPixels(info, const_cast<void*>(static_cast<void const*>(bitmap->scanline(0))), bitmap->pitch());
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impl.sk_bitmap.setImmutable();
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impl.sk_image = impl.sk_bitmap.asImage();
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impl.source = bitmap;
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impl.color_space = move(color_space);
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return adopt_ref(*new ImmutableBitmap(make<ImmutableBitmapImpl>(impl)));
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}
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NonnullRefPtr<ImmutableBitmap> ImmutableBitmap::create(NonnullRefPtr<Bitmap> bitmap, AlphaType alpha_type, ColorSpace color_space)
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{
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// Convert the source bitmap to the right alpha type on a mismatch. We want to do this when converting from a
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// Bitmap to an ImmutableBitmap, since at that point we usually know the right alpha type to use in context.
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auto source_bitmap = bitmap;
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if (source_bitmap->alpha_type() != alpha_type) {
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source_bitmap = MUST(bitmap->clone());
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source_bitmap->set_alpha_type_destructive(alpha_type);
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}
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return create(source_bitmap, move(color_space));
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}
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NonnullRefPtr<ImmutableBitmap> ImmutableBitmap::create_snapshot_from_painting_surface(NonnullRefPtr<PaintingSurface> painting_surface)
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{
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ImmutableBitmapImpl impl;
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impl.sk_image = painting_surface->sk_image_snapshot<sk_sp<SkImage>>();
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impl.source = painting_surface;
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return adopt_ref(*new ImmutableBitmap(make<ImmutableBitmapImpl>(impl)));
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}
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ImmutableBitmap::ImmutableBitmap(NonnullOwnPtr<ImmutableBitmapImpl> impl)
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: m_impl(move(impl))
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{
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}
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ImmutableBitmap::~ImmutableBitmap() = default;
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}
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