146 lines
4.1 KiB
C++
146 lines
4.1 KiB
C++
/*
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* Copyright (C) 2026 Behdad Esfahbod
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Author(s): Behdad Esfahbod
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*/
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#ifndef HB_GPU_DRAW_HH
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#define HB_GPU_DRAW_HH
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#include "hb.hh"
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#include "hb-gpu.h"
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#include "hb-object.hh"
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#include "hb-vector.hh"
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#include <cmath>
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#define HB_GPU_UNITS_PER_EM 4
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struct hb_gpu_curve_t
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{
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double p1x, p1y;
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double p2x, p2y;
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double p3x, p3y;
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bool contour_start;
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};
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struct hb_gpu_encode_curve_info_t
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{
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double min_x, max_x, min_y, max_y;
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bool is_horizontal;
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bool is_vertical;
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int hband_lo, hband_hi;
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int vband_lo, vband_hi;
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};
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struct hb_gpu_encode_scratch_t
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{
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hb_vector_t<hb_gpu_encode_curve_info_t> curve_infos;
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hb_vector_t<unsigned> hband_curve_counts;
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hb_vector_t<unsigned> vband_curve_counts;
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hb_vector_t<unsigned> hband_offsets;
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hb_vector_t<unsigned> vband_offsets;
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hb_vector_t<unsigned> hband_curves;
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hb_vector_t<unsigned> hband_curves_asc;
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hb_vector_t<unsigned> vband_curves;
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hb_vector_t<unsigned> vband_curves_asc;
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hb_vector_t<unsigned> hband_cursors;
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hb_vector_t<unsigned> vband_cursors;
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hb_vector_t<unsigned> curve_texel_offset;
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void clear ()
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{
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curve_infos.clear ();
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hband_curve_counts.clear ();
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vband_curve_counts.clear ();
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hband_offsets.clear ();
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vband_offsets.clear ();
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hband_curves.clear ();
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hband_curves_asc.clear ();
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vband_curves.clear ();
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vband_curves_asc.clear ();
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hband_cursors.clear ();
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vband_cursors.clear ();
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curve_texel_offset.clear ();
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}
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};
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struct hb_gpu_draw_t
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{
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hb_object_header_t header;
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/* Accumulator state */
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double start_x = 0, start_y = 0;
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double current_x = 0, current_y = 0;
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bool need_moveto = true;
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unsigned num_curves = 0;
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bool success = true;
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hb_vector_t<hb_gpu_curve_t> curves;
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/* Extents tracking (updated during accumulation) */
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double ext_min_x = HUGE_VAL;
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double ext_min_y = HUGE_VAL;
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double ext_max_x = -HUGE_VAL;
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double ext_max_y = -HUGE_VAL;
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/* Font scale (set by hb_gpu_draw_set_scale or hb_gpu_draw_glyph). */
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int x_scale = 0;
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int y_scale = 0;
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/* Work budget for outline traversal and generated curves. A paint
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* backend seeds this through the public draw-budget API before drawing
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* and reads the remainder back afterwards, so a whole paint session
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* shares one budget without reaching into this object. */
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int64_t budget = HB_BUDGET_DEFAULT;
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int64_t budget_remaining = HB_BUDGET_GLYPH;
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void recharge_budget ()
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{
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budget_remaining = budget == HB_BUDGET_DEFAULT ?
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HB_BUDGET_GLYPH : budget;
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}
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int64_t *get_budget_remaining ()
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{ return &budget_remaining; }
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/* Encode scratch (reused across calls) */
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hb_gpu_encode_scratch_t scratch;
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/* Recycled blob for encode output */
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hb_blob_t *recycled_blob = nullptr;
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/* Internal accumulation methods */
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HB_INTERNAL void acc_move_to (double x, double y);
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HB_INTERNAL void acc_line_to (double x, double y);
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HB_INTERNAL void acc_conic_to (double cx, double cy, double x, double y);
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HB_INTERNAL void acc_cubic_to (double c1x, double c1y,
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double c2x, double c2y,
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double x, double y);
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HB_INTERNAL void acc_close_path ();
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};
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#endif /* HB_GPU_DRAW_HH */
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