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125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "framebuffer.h"
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#include "drivers/display.h"
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#include "system/logging.h"
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#include "system/passert.h"
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#include "util/bitset.h"
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#include <stdint.h>
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#include <string.h>
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const int FrameBuffer_MaxX = DISP_COLS;
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const int FrameBuffer_MaxY = DISP_ROWS;
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static FrameBuffer* s_current_framebuffer;
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static uint8_t s_current_flush_line;
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static void flush_complete(void);
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static bool flush_get_next_line(DisplayRow* row);
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static void framebuffer_reset_dirty_lines(FrameBuffer* f);
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uint32_t* framebuffer_get_line(FrameBuffer* f, uint8_t y) {
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PBL_ASSERT(y < FrameBuffer_MaxY, "Y coordinate is outside of framebuffer dimensions");
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return f->buffer + (y * FRAMEBUFFER_WORDS_PER_ROW);
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}
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void framebuffer_clear(FrameBuffer* f) {
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memset(f->buffer, 0xffffffff, FRAMEBUFFER_SIZE_BYTES);
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memset(f->dirty_lines, 0xff, DISP_ROWS / 8);
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f->is_dirty = true;
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f->is_cleared = false;
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}
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void framebuffer_clear_line(FrameBuffer* f, uint8_t y) {
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uint32_t* line = framebuffer_get_line(f, y);
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memset(line, 0xffffffff, FRAMEBUFFER_SIZE_BYTES);
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bitset8_set(f->dirty_lines, y);
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f->is_dirty = true;
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}
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void framebuffer_mark_dirty_rect(FrameBuffer* f, GRect rect) {
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const uint16_t y_start = rect.origin.y;
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const uint16_t y_end = y_start + rect.size.h;
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for (uint16_t y = y_start; y < y_end; ++y) {
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bitset8_update(f->dirty_lines, y, is_dirty);
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}
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f->is_dirty = true;
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}
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void framebuffer_set_line(FrameBuffer* f, uint8_t y, const uint32_t* buffer) {
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memcpy(framebuffer_get_line(f, y), buffer, FRAMEBUFFER_WORDS_PER_ROW);
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bitset8_set(f->dirty_lines, y);
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f->is_dirty = true;
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}
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void framebuffer_set_lines(FrameBuffer* f, uint8_t y, const uint8_t num_lines, const uint32_t* buffer) {
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uint32_t* line = framebuffer_get_line(f, y);
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memcpy(line, buffer, num_lines * FRAMEBUFFER_WORDS_PER_ROW);
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const GRect dirty_rect = GRect(0, y, DISP_COLS, num_lines);
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framebuffer_mark_dirty_rect(f, dirty_rect);
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}
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void framebuffer_flush(FrameBuffer* f) {
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// If the framebuffer hasn't been cleared but it is dirty, issue a
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// display command to blank the screen.
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if (f->is_cleared) {
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display_clear();
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f->is_cleared = false;
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}
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if (!f->is_dirty) {
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return;
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}
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s_current_framebuffer = f;
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s_current_flush_line = 0;
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display_update(&flush_get_next_line, &flush_complete);
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}
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static void flush_complete(void) {
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s_current_flush_line = 0;
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framebuffer_reset_dirty_lines(s_current_framebuffer);
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}
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static bool flush_get_next_line(DisplayRow* row) {
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while (s_current_flush_line < DISP_ROWS) {
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if (bitset8_get(s_current_framebuffer->dirty_lines, s_current_flush_line)) {
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row->address = s_current_flush_line;
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row->data = framebuffer_get_line(s_current_framebuffer, s_current_flush_line);
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s_current_flush_line++;
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return true;
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}
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s_current_flush_line++;
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}
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return false;
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}
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static void framebuffer_reset_dirty(FrameBuffer* f) {
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memset(f->dirty_lines, 0x00, DISP_ROWS / 8);
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f->is_dirty = false;
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f->is_cleared = false;
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}
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