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https://github.com/openmv/openmv.git
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337 lines
11 KiB
C
337 lines
11 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2013-2024 OpenMV, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* Framebuffer functions.
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*/
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#include <stdio.h>
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#include "py/mphal.h"
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#include "mpprint.h"
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#include "fmath.h"
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#include "framebuffer.h"
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#include "omv_boardconfig.h"
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extern char _fb_memory_start;
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extern char _fb_memory_end;
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static framebuffer_t framebuffer;
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extern char _jpeg_memory_start;
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extern char _jpeg_memory_end;
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jpegbuffer_t jpegbuffer;
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void framebuffer_init0() {
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// Save enable flag before resetting the state.
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int fb_enabled = jpegbuffer.enabled;
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// Initialize the static frame buffer.
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framebuffer_init(&framebuffer, &_fb_memory_start, &_fb_memory_end - &_fb_memory_start, false);
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// Initialize jpeg buffer.
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memset(&jpegbuffer, 0, sizeof(jpegbuffer_t));
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mutex_init0(&jpegbuffer.lock);
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jpegbuffer.enabled = fb_enabled;
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jpegbuffer.pixels = (uint8_t *) &_jpeg_memory_start;
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jpegbuffer.quality = ((OMV_JPEG_QUALITY_HIGH - OMV_JPEG_QUALITY_LOW) / 2) + OMV_JPEG_QUALITY_LOW;
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}
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void framebuffer_init(framebuffer_t *fb, void *buff, size_t size, bool dynamic) {
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// Clear framebuffers
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memset(fb, 0, sizeof(framebuffer_t));
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fb->raw_size = size;
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fb->raw_base = buff;
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fb->dynamic = dynamic;
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}
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void framebuffer_init_image(framebuffer_t *fb, image_t *img) {
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if (img != NULL) {
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vbuffer_t *buffer = framebuffer_acquire(fb, FB_FLAG_USED | FB_FLAG_PEEK);
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img->w = fb->w;
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img->h = fb->h;
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img->size = fb->size;
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img->pixfmt = fb->pixfmt;
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img->pixels = (buffer == NULL) ? NULL : buffer->data;
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}
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}
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void framebuffer_init_from_image(framebuffer_t *fb, image_t *img) {
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fb->w = img->w;
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fb->h = img->h;
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fb->size = img->size;
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fb->pixfmt = img->pixfmt;
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}
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static void jpegbuffer_init_from_image(image_t *img) {
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if (img == NULL) {
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jpegbuffer.w = 0;
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jpegbuffer.h = 0;
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jpegbuffer.size = 0;
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} else {
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jpegbuffer.w = img->w;
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jpegbuffer.h = img->h;
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jpegbuffer.size = img->size;
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}
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}
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framebuffer_t *framebuffer_get(size_t id) {
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return &framebuffer;
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}
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char *framebuffer_pool_start(framebuffer_t *fb, size_t buf_count) {
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size_t qsize = (buf_count <= 3) ? 0 : queue_calc_size(buf_count);
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return fb->raw_base + OMV_ALIGN_TO(qsize * 2, FRAMEBUFFER_ALIGNMENT);
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}
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char *framebuffer_pool_end(framebuffer_t *fb) {
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char *pool_start = framebuffer_pool_start(fb, fb->buf_count);
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return pool_start + ((fb->buf_size + sizeof(vbuffer_t)) * fb->buf_count);
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}
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void *framebuffer_pool_get(framebuffer_t *fb, int32_t index) {
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char *pool_start = framebuffer_pool_start(fb, fb->buf_count);
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return pool_start + ((fb->buf_size + sizeof(vbuffer_t)) * index);
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}
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void framebuffer_flush(framebuffer_t *fb) {
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// Invalidate the frame buffer.
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fb->pixfmt = PIXFORMAT_INVALID;
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// Drop all frame buffers.
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if (fb->buf_count) {
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queue_flush(fb->free_queue);
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queue_flush(fb->used_queue);
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}
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for (size_t i=0; i<fb->buf_count; i++) {
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vbuffer_t *buffer = framebuffer_pool_get(fb, i);
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// Reset the buffer's state.
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framebuffer_reset(buffer);
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// Discard any cached CPU writes.
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#ifdef __DCACHE_PRESENT
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SCB_InvalidateDCache_by_Addr(buffer->data, fb->buf_size);
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#endif
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// Push it back the free queue.
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queue_push(fb->free_queue, buffer);
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}
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}
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int framebuffer_resize(framebuffer_t *fb, size_t count, bool expand) {
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size_t buf_size = 0;
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// Queue size given the requested buffer count.
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size_t queue_size = queue_calc_size(count);
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// Maximum usable memory size without queues.
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size_t max_size = fb->raw_size - queue_size * 2;
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size_t min_size = fb->frame_size + sizeof(vbuffer_t);
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// Use the frame buffer memory for big queues.
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char *queue_memory = (count > 3) ? fb->raw_base : fb->raw_static;
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// Calculate a single buffer size (including vbuffer header).
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if (!expand) {
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// No expansion: buffer size equals frame size plus header.
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buf_size = OMV_ALIGN_TO(min_size, FRAMEBUFFER_ALIGNMENT);
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} else if (fb->dynamic) {
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// Expanding a dynamic FB: divide the raw buffer size evenly.
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buf_size = OMV_ALIGN_DOWN(max_size / count, FRAMEBUFFER_ALIGNMENT);
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} else {
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// Expanding a static FB: calculate the free FB memory size.
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size_t fb_size = fb_alloc_sp() - framebuffer_pool_start(fb, count);
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max_size = IM_MIN(max_size, fb_size);
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buf_size = OMV_ALIGN_DOWN(max_size / count, FRAMEBUFFER_ALIGNMENT);
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}
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// Ensure that the buffer size is reasonable.
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if (buf_size < min_size || buf_size * count > max_size) {
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return -1;
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}
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// Initialize the frame buffer.
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fb->expanded = expand;
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fb->buf_count = count;
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fb->buf_size = buf_size - sizeof(vbuffer_t);
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// Initialize the buffer queues.
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queue_init(&fb->free_queue, count, &queue_memory[queue_size * 0]);
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queue_init(&fb->used_queue, count, &queue_memory[queue_size * 1]);
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// Flush and reset the queues.
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framebuffer_flush(fb);
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return 0;
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}
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bool framebuffer_writable(framebuffer_t *fb) {
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return !queue_is_empty(fb->free_queue);
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}
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bool framebuffer_readable(framebuffer_t *fb) {
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return !queue_is_empty(fb->used_queue);
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}
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vbuffer_t *framebuffer_acquire(framebuffer_t *fb, uint32_t flags) {
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queue_t *queue = (flags & FB_FLAG_USED) ? fb->used_queue : fb->free_queue;
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vbuffer_t *buffer = queue_pop(queue, (flags & FB_FLAG_PEEK));
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#ifdef __DCACHE_PRESENT
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// Discard any cached CPU writes.
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if (buffer && (flags & FB_FLAG_INVALIDATE)) {
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SCB_InvalidateDCache_by_Addr(buffer->data, fb->buf_size);
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}
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#endif
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return buffer;
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}
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vbuffer_t *framebuffer_release(framebuffer_t *fb, uint32_t flags) {
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vbuffer_t *buffer = NULL;
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if ((flags & FB_FLAG_CHECK_LAST) && queue_size(fb->free_queue) == 1) {
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if (fb->buf_count == 2) {
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// Double buffer: Reset but do Not release the buffer.
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vbuffer_t *buffer = queue_pop(fb->free_queue, true);
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framebuffer_reset(buffer);
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return NULL;
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} else if (fb->buf_count == 3) {
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// Triple buffer: Swap the old buffer with the latest.
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vbuffer_t *buffer = queue_swap(fb->used_queue, fb->free_queue);
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framebuffer_reset(buffer);
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return NULL;
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}
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}
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if ((buffer = framebuffer_acquire(fb, flags))) {
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if (flags & FB_FLAG_USED) {
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// Invalidate the frame buffer.
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fb->pixfmt = PIXFORMAT_INVALID;
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// Move the buffer back to the free queue.
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framebuffer_reset(buffer);
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queue_push(fb->free_queue, buffer);
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} else {
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// Move the buffer back to the used queue.
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queue_push(fb->used_queue, buffer);
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}
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}
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return buffer;
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}
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void framebuffer_update_jpeg_buffer(image_t *src) {
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static int overflow_count = 0;
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const size_t max_size = (&_jpeg_memory_end - &_jpeg_memory_start) - sizeof(jpegbuffer_t);
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// Check if JPEG buffer is disabled, image is NULL or format is not set.
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if (!jpegbuffer.enabled || !src->data || src->pixfmt == PIXFORMAT_INVALID) {
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return;
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}
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// Lock the JPEG buffer.
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if (!mutex_try_lock_alternate(&jpegbuffer.lock, MUTEX_TID_OMV)) {
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return;
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}
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if (src->is_compressed) {
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if (max_size < src->size) {
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jpegbuffer_init_from_image(NULL);
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mp_printf(MP_PYTHON_PRINTER, "\x1b[40O\n");
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} else {
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jpegbuffer_init_from_image(src);
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memcpy(jpegbuffer.pixels, src->pixels, src->size);
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}
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} else {
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image_t dst = {
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.w = src->w,
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.h = src->h,
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.pixfmt = PIXFORMAT_JPEG,
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.size = max_size,
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.pixels = jpegbuffer.pixels
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};
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bool compress = true;
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bool overflow = false;
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#if OMV_RAW_PREVIEW_ENABLE
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if (src->is_mutable) {
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// Down-scale the frame (if necessary) and send the raw frame.
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dst.size = src->bpp;
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dst.pixfmt = src->pixfmt;
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if (src->w <= OMV_RAW_PREVIEW_WIDTH && src->h <= OMV_RAW_PREVIEW_HEIGHT) {
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if (image_size(&dst) <= max_size) {
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memcpy(dst.pixels, src->pixels, image_size(src));
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compress = false;
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}
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} else {
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float x_scale = OMV_RAW_PREVIEW_WIDTH / (float) src->w;
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float y_scale = OMV_RAW_PREVIEW_HEIGHT / (float) src->h;
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float scale = IM_MIN(x_scale, y_scale);
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dst.w = fast_floorf(src->w * scale);
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dst.h = fast_floorf(src->h * scale);
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if (image_size(&dst) <= max_size) {
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imlib_draw_image(&dst, src, 0, 0, scale, scale, NULL, -1, 255, NULL, NULL,
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IMAGE_HINT_BILINEAR | IMAGE_HINT_BLACK_BACKGROUND, NULL,
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NULL, NULL);
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compress = false;
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}
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}
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}
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#endif
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if (compress) {
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// For all other formats, send a compressed frame.
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overflow = jpeg_compress(src, &dst, jpegbuffer.quality, false, JPEG_SUBSAMPLING_AUTO);
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}
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if (overflow) {
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// JPEG buffer overflowed, reduce JPEG quality for the next frame
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// and skip the current frame. The IDE doesn't receive this frame.
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if (jpegbuffer.quality > 1) {
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// Keep this quality for the next n frames
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overflow_count = 60;
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jpegbuffer.quality = IM_MAX(1, (jpegbuffer.quality / 2));
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}
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jpegbuffer_init_from_image(NULL);
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} else {
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if (overflow_count) {
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overflow_count--;
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}
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// Dynamically adjust our quality if the image is huge.
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bool big_frame = image_size(src) > OMV_JPEG_QUALITY_THRESHOLD;
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int quality_max = big_frame ? OMV_JPEG_QUALITY_LOW : OMV_JPEG_QUALITY_HIGH;
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// No buffer overflow, increase quality up to max quality based on frame size...
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if ((!overflow_count) && (jpegbuffer.quality < quality_max)) {
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jpegbuffer.quality++;
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}
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jpegbuffer_init_from_image(&dst);
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}
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}
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// Unlock the JPEG buffer.
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mutex_unlock(&jpegbuffer.lock, MUTEX_TID_OMV);
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}
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