mirror of
https://github.com/ByteWelder/Tactility.git
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87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// Tactility's Material themes (Modules/lvgl-module) derive both widget metrics (switch/checkbox/
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// slider sizes, radius, borders, ...) and spacing (padding/gaps) from the display DPI. On this
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// high-DPI panel (`display.dpi` = 326) those metrics are far too large relative to the text, but
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// simply lowering the DPI to tighten the spacing also shrinks the widgets to unusable sizes - the
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// switch track, for example, is LV_DPX_CALC(dpi, 52) x LV_DPX_CALC(dpi, 32).
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//
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// So the two are decoupled here, board-locally, with link-time wrappers (the same mechanism used
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// elsewhere) instead of editing core Tactility/LVGL source:
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// - lv_display_create(): the display DPI tracks the text font, so widget sizes stay usable;
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// - lv_style_set_pad_*(): the theme's style paddings/gaps are divided, so spacing stays tight.
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// Only the two theme files use style-based padding (apps use lv_obj_set_style_*, which does not go
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// through these setters), so the padding wrappers affect the theme and nothing else.
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#include <tactility/log.h>
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#include <lvgl/fonts.h>
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#include <lvgl/lvgl.h>
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constexpr auto* TAG = "waveshare-s3-touch-amoled-206";
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namespace {
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// Widget metrics scale with the display DPI; this puts them near Material's baseline at the
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// default 22 px font (e.g. the switch track is ~50 x 31 px).
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constexpr int32_t WIDGET_DPI_PER_FONT_PIXEL = 7;
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// Spacing is divided by this instead of following the widget DPI (e.g. the theme's largest control
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// padding, dp(24), becomes ~3 px).
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constexpr int32_t PADDING_DIVISOR = 8;
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int32_t scalePadding(int32_t value) {
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// Keep zero and negative values (handle/knob geometry) as the theme designed them.
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if (value <= 0) {
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return value;
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}
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return (value + PADDING_DIVISOR / 2) / PADDING_DIVISOR;
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}
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int32_t displayDpiForFontSize(int32_t font_size) {
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return font_size * WIDGET_DPI_PER_FONT_PIXEL;
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}
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} // namespace
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extern "C" {
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lv_display_t* __real_lv_display_create(int32_t hor_res, int32_t ver_res);
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lv_display_t* __wrap_lv_display_create(int32_t hor_res, int32_t ver_res) {
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lv_display_t* display = __real_lv_display_create(hor_res, ver_res);
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if (display == nullptr) {
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return display;
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}
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const int32_t font_size = static_cast<int32_t>(lvgl_get_text_font_height(FONT_SIZE_DEFAULT));
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if (font_size <= 0) {
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return display;
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}
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const int32_t dpi = displayDpiForFontSize(font_size);
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if (lv_display_get_dpi(display) != dpi) {
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lv_display_set_dpi(display, dpi);
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LOG_I(TAG, "LVGL display DPI set to %d for text font %d px", (int)dpi, (int)font_size);
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}
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return display;
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}
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// lv_style_set_pad_all/hor/ver/gap are static inline and call these base setters, so wrapping the
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// six base ones covers every padding a theme style sets.
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#define WRAP_PADDING_SETTER(name) \
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void __real_##name(lv_style_t* style, int32_t value); \
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void __wrap_##name(lv_style_t* style, int32_t value) { __real_##name(style, scalePadding(value)); }
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WRAP_PADDING_SETTER(lv_style_set_pad_top)
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WRAP_PADDING_SETTER(lv_style_set_pad_bottom)
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WRAP_PADDING_SETTER(lv_style_set_pad_left)
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WRAP_PADDING_SETTER(lv_style_set_pad_right)
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WRAP_PADDING_SETTER(lv_style_set_pad_row)
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WRAP_PADDING_SETTER(lv_style_set_pad_column)
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#undef WRAP_PADDING_SETTER
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} // extern "C"
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