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Use Poppler library for better PDF rendering.
The libgraphicsmagick attempts to invoke ghostscript with limited resolution. Issues #126
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| // -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; -*- | ||
| // (c) 2023 Henner Zeller <[email protected]> | ||
| // | ||
| // This program is free software; you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation version 2. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://gnu.org/licenses/gpl-2.0.txt> | ||
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| #include "pdf-image-source.h" | ||
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| #include <cairo.h> | ||
| #include <poppler.h> | ||
| #include <stdlib.h> | ||
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| #include <algorithm> | ||
| #include <filesystem> | ||
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| #include "framebuffer.h" | ||
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| namespace fs = std::filesystem; | ||
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| namespace timg { | ||
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| std::string PDFImageSource::FormatTitle( | ||
| const std::string &format_string) const { | ||
| return FormatFromParameters(format_string, filename_, (int)orig_width_, | ||
| (int)orig_height_, "pdf"); | ||
| } | ||
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| bool PDFImageSource::LoadAndScale(const DisplayOptions &opts, int, int) { | ||
| options_ = opts; | ||
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| GError *error = nullptr; | ||
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| // Poppler wants a URI as input. | ||
| std::string uri = "file://" + fs::absolute(filename_).string(); | ||
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| PopplerDocument *document = | ||
| poppler_document_new_from_file(uri.c_str(), nullptr, &error); | ||
| if (!document) { | ||
| fprintf(stderr, "no dice %s\n", error->message); | ||
| return false; | ||
| } | ||
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| const int page_count = poppler_document_get_n_pages(document); | ||
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| for (int page_num = 0; page_num < page_count; ++page_num) { | ||
| PopplerPage *page = poppler_document_get_page(document, page_num); | ||
| if (page == nullptr) { | ||
| return false; | ||
| } | ||
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| poppler_page_get_size(page, &orig_width_, &orig_height_); | ||
| int target_width; | ||
| int target_height; | ||
| CalcScaleToFitDisplay(orig_width_, orig_height_, opts, false, | ||
| &target_width, &target_height); | ||
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| int render_width = target_width; | ||
| int render_height = target_height; | ||
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| const auto kCairoFormat = CAIRO_FORMAT_ARGB32; | ||
| int stride = cairo_format_stride_for_width(kCairoFormat, render_width); | ||
| std::unique_ptr<timg::Framebuffer> image( | ||
| new timg::Framebuffer(stride / 4, render_height)); | ||
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| cairo_surface_t *surface = cairo_image_surface_create_for_data( | ||
| (uint8_t *)image->begin(), kCairoFormat, render_width, | ||
| render_height, stride); | ||
| cairo_t *cr = cairo_create(surface); | ||
| cairo_scale(cr, 1.0 * render_width / orig_width_, | ||
| 1.0 * render_height / orig_height_); | ||
| cairo_save(cr); | ||
| cairo_set_source_rgb(cr, 1, 1, 1); | ||
| cairo_paint(cr); | ||
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| poppler_page_render(page, cr); | ||
| cairo_restore(cr); | ||
| g_object_unref(page); | ||
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| // render | ||
| cairo_destroy(cr); | ||
| cairo_surface_destroy(surface); | ||
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| // Cairo stores A (high-byte), R, G, B (low-byte). We need ABGR. | ||
| for (rgba_t &pixel : *image) { | ||
| std::swap(pixel.r, pixel.b); | ||
| } | ||
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| // TODO: implement auto-crop and crop-border | ||
| pages_.emplace_back(std::move(image)); | ||
| } | ||
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| return true; | ||
| } | ||
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| int PDFImageSource::IndentationIfCentered( | ||
| const timg::Framebuffer &image) const { | ||
| return options_.center_horizontally ? (options_.width - image.width()) / 2 | ||
| : 0; | ||
| } | ||
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| void PDFImageSource::SendFrames(const Duration &duration, int loops, | ||
| const volatile sig_atomic_t &interrupt_received, | ||
| const Renderer::WriteFramebufferFun &sink) { | ||
| for (const auto &page : pages_) { | ||
| const int dx = IndentationIfCentered(*page); | ||
| sink(dx, 0, *page, SeqType::FrameImmediate, {}); | ||
| } | ||
| } | ||
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| } // namespace timg |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; -*- | ||
| // (c) 2023 Henner Zeller <[email protected]> | ||
| // | ||
| // This program is free software; you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation version 2. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://gnu.org/licenses/gpl-2.0.txt> | ||
|
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| #ifndef PDF_SOURCE_H_ | ||
| #define PDF_SOURCE_H_ | ||
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| #include <memory> | ||
| #include <vector> | ||
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| #include "display-options.h" | ||
| #include "image-source.h" | ||
| #include "terminal-canvas.h" | ||
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| namespace timg { | ||
| class PDFImageSource final : public ImageSource { | ||
| public: | ||
| explicit PDFImageSource(const std::string &filename) | ||
| : ImageSource(filename) {} | ||
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| bool LoadAndScale(const DisplayOptions &options, int frame_offset, | ||
| int frame_count) final; | ||
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| void SendFrames(const Duration &duration, int loops, | ||
| const volatile sig_atomic_t &interrupt_received, | ||
| const Renderer::WriteFramebufferFun &sink) final; | ||
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| std::string FormatTitle(const std::string &format_string) const final; | ||
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| private: | ||
| int IndentationIfCentered(const timg::Framebuffer &image) const; | ||
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| DisplayOptions options_; | ||
| double orig_width_, orig_height_; | ||
| std::vector<std::unique_ptr<timg::Framebuffer>> pages_; | ||
| }; | ||
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| } // namespace timg | ||
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| #endif // QOI_SOURCE_H_ |
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