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285 lines
11 KiB
C
285 lines
11 KiB
C
// Copyright 2022 Nick Brassel (@tzarc)
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "color.h"
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#include "qp_rgb565_surface.h"
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#include "qp_draw.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Common
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// Device definition
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typedef struct rgb565_surface_painter_device_t {
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painter_driver_t base; // must be first, so it can be cast to/from the painter_device_t* type
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// The target buffer
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uint16_t *buffer;
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// Manually manage the viewport for streaming pixel data to the display
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uint16_t viewport_l;
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uint16_t viewport_t;
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uint16_t viewport_r;
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uint16_t viewport_b;
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// Current write location to the display when streaming pixel data
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uint16_t pixdata_x;
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uint16_t pixdata_y;
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// Maintain a dirty region so we can stream only what we need
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bool is_dirty;
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uint16_t dirty_l;
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uint16_t dirty_t;
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uint16_t dirty_r;
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uint16_t dirty_b;
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} rgb565_surface_painter_device_t;
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// Driver storage
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rgb565_surface_painter_device_t surface_drivers[RGB565_SURFACE_NUM_DEVICES] = {0};
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Helpers
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static inline void increment_pixdata_location(rgb565_surface_painter_device_t *surface) {
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// Increment the X-position
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surface->pixdata_x++;
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// If the x-coord has gone past the right-side edge, loop it back around and increment the y-coord
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if (surface->pixdata_x > surface->viewport_r) {
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surface->pixdata_x = surface->viewport_l;
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surface->pixdata_y++;
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}
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// If the y-coord has gone past the bottom, loop it back to the top
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if (surface->pixdata_y > surface->viewport_b) {
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surface->pixdata_y = surface->viewport_t;
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}
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}
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static inline void setpixel(rgb565_surface_painter_device_t *surface, uint16_t x, uint16_t y, uint16_t rgb565) {
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// Skip messing with the dirty info if the original value already matches
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if (surface->buffer[y * surface->base.panel_width + x] != rgb565) {
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// Maintain dirty region
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if (surface->dirty_l > x) {
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surface->dirty_l = x;
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}
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if (surface->dirty_r < x) {
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surface->dirty_r = x;
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}
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if (surface->dirty_t > y) {
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surface->dirty_t = y;
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}
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if (surface->dirty_b < y) {
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surface->dirty_b = y;
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}
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// Always dirty after a setpixel
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surface->is_dirty = true;
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// Update the pixel data in the buffer
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surface->buffer[y * surface->base.panel_width + x] = rgb565;
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}
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}
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static inline void append_pixel(rgb565_surface_painter_device_t *surface, uint16_t rgb565) {
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setpixel(surface, surface->pixdata_x, surface->pixdata_y, rgb565);
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increment_pixdata_location(surface);
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}
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static inline void stream_pixdata(rgb565_surface_painter_device_t *surface, const uint16_t *data, uint32_t native_pixel_count) {
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for (uint32_t pixel_counter = 0; pixel_counter < native_pixel_count; ++pixel_counter) {
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append_pixel(surface, data[pixel_counter]);
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Driver vtable
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static bool qp_rgb565_surface_init(painter_device_t device, painter_rotation_t rotation) {
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painter_driver_t * driver = (painter_driver_t *)device;
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rgb565_surface_painter_device_t *surface = (rgb565_surface_painter_device_t *)driver;
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memset(surface->buffer, 0, driver->panel_width * driver->panel_height * driver->native_bits_per_pixel / 8);
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return true;
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}
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static bool qp_rgb565_surface_power(painter_device_t device, bool power_on) {
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// No-op.
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return true;
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}
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static bool qp_rgb565_surface_clear(painter_device_t device) {
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painter_driver_t *driver = (painter_driver_t *)device;
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driver->driver_vtable->init(device, driver->rotation); // Re-init the surface
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return true;
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}
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static bool qp_rgb565_surface_flush(painter_device_t device) {
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painter_driver_t * driver = (painter_driver_t *)device;
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rgb565_surface_painter_device_t *surface = (rgb565_surface_painter_device_t *)driver;
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surface->dirty_l = surface->dirty_t = UINT16_MAX;
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surface->dirty_r = surface->dirty_b = 0;
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surface->is_dirty = false;
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return true;
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}
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static bool qp_rgb565_surface_viewport(painter_device_t device, uint16_t left, uint16_t top, uint16_t right, uint16_t bottom) {
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painter_driver_t * driver = (painter_driver_t *)device;
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rgb565_surface_painter_device_t *surface = (rgb565_surface_painter_device_t *)driver;
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// Set the viewport locations
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surface->viewport_l = left;
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surface->viewport_t = top;
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surface->viewport_r = right;
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surface->viewport_b = bottom;
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// Reset the write location to the top left
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surface->pixdata_x = left;
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surface->pixdata_y = top;
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return true;
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}
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// Stream pixel data to the current write position in GRAM
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static bool qp_rgb565_surface_pixdata(painter_device_t device, const void *pixel_data, uint32_t native_pixel_count) {
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painter_driver_t * driver = (painter_driver_t *)device;
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rgb565_surface_painter_device_t *surface = (rgb565_surface_painter_device_t *)driver;
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stream_pixdata(surface, (const uint16_t *)pixel_data, native_pixel_count);
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return true;
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}
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// Pixel colour conversion
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static bool qp_rgb565_surface_palette_convert_rgb565_swapped(painter_device_t device, int16_t palette_size, qp_pixel_t *palette) {
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for (int16_t i = 0; i < palette_size; ++i) {
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RGB rgb = hsv_to_rgb_nocie((HSV){palette[i].hsv888.h, palette[i].hsv888.s, palette[i].hsv888.v});
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uint16_t rgb565 = (((uint16_t)rgb.r) >> 3) << 11 | (((uint16_t)rgb.g) >> 2) << 5 | (((uint16_t)rgb.b) >> 3);
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palette[i].rgb565 = __builtin_bswap16(rgb565);
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}
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return true;
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}
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// Append pixels to the target location, keyed by the pixel index
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static bool qp_rgb565_surface_append_pixels_rgb565(painter_device_t device, uint8_t *target_buffer, qp_pixel_t *palette, uint32_t pixel_offset, uint32_t pixel_count, uint8_t *palette_indices) {
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uint16_t *buf = (uint16_t *)target_buffer;
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for (uint32_t i = 0; i < pixel_count; ++i) {
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buf[pixel_offset + i] = palette[palette_indices[i]].rgb565;
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}
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return true;
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}
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// Append data to the target location
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static bool qp_rgb565_surface_append_pixdata(painter_device_t device, uint8_t *target_buffer, uint32_t pixdata_offset, uint8_t pixdata_byte) {
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target_buffer[pixdata_offset] = pixdata_byte;
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return true;
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}
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const painter_driver_vtable_t rgb565_surface_driver_vtable = {
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.init = qp_rgb565_surface_init,
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.power = qp_rgb565_surface_power,
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.clear = qp_rgb565_surface_clear,
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.flush = qp_rgb565_surface_flush,
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.pixdata = qp_rgb565_surface_pixdata,
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.viewport = qp_rgb565_surface_viewport,
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.palette_convert = qp_rgb565_surface_palette_convert_rgb565_swapped,
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.append_pixels = qp_rgb565_surface_append_pixels_rgb565,
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.append_pixdata = qp_rgb565_surface_append_pixdata,
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Comms vtable
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static bool qp_rgb565_surface_comms_init(painter_device_t device) {
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// No-op.
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return true;
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}
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static bool qp_rgb565_surface_comms_start(painter_device_t device) {
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// No-op.
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return true;
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}
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static void qp_rgb565_surface_comms_stop(painter_device_t device) {
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// No-op.
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}
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uint32_t qp_rgb565_surface_comms_send(painter_device_t device, const void *data, uint32_t byte_count) {
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// No-op.
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return byte_count;
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}
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painter_comms_vtable_t rgb565_surface_driver_comms_vtable = {
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// These are all effective no-op's because they're not actually needed.
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.comms_init = qp_rgb565_surface_comms_init,
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.comms_start = qp_rgb565_surface_comms_start,
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.comms_stop = qp_rgb565_surface_comms_stop,
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.comms_send = qp_rgb565_surface_comms_send};
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Factory function for creating a handle to an rgb565 surface
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painter_device_t qp_rgb565_make_surface(uint16_t panel_width, uint16_t panel_height, void *buffer) {
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for (uint32_t i = 0; i < RGB565_SURFACE_NUM_DEVICES; ++i) {
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rgb565_surface_painter_device_t *driver = &surface_drivers[i];
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if (!driver->base.driver_vtable) {
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driver->base.driver_vtable = &rgb565_surface_driver_vtable;
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driver->base.comms_vtable = &rgb565_surface_driver_comms_vtable;
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driver->base.native_bits_per_pixel = 16; // RGB565
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driver->base.panel_width = panel_width;
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driver->base.panel_height = panel_height;
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driver->base.rotation = QP_ROTATION_0;
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driver->base.offset_x = 0;
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driver->base.offset_y = 0;
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driver->buffer = (uint16_t *)buffer;
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return (painter_device_t)driver;
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}
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}
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return NULL;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Drawing routine to copy out the dirty region and send it to another device
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bool qp_rgb565_surface_draw(painter_device_t surface, painter_device_t display, uint16_t x, uint16_t y) {
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painter_driver_t * surface_driver = (painter_driver_t *)surface;
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rgb565_surface_painter_device_t *surface_handle = (rgb565_surface_painter_device_t *)surface_driver;
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// If we're not dirty... we're done.
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if (!surface_handle->is_dirty) {
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return true;
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}
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// Set the target drawing area
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bool ok = qp_viewport(display, x + surface_handle->dirty_l, y + surface_handle->dirty_t, x + surface_handle->dirty_r, y + surface_handle->dirty_b);
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if (!ok) {
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return false;
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}
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// Housekeeping of the amount of pixels to transfer
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uint32_t total_pixel_count = QUANTUM_PAINTER_PIXDATA_BUFFER_SIZE / sizeof(uint16_t);
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uint32_t pixel_counter = 0;
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uint16_t *target_buffer = (uint16_t *)qp_internal_global_pixdata_buffer;
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// Fill the global pixdata area so that we can start transferring to the panel
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for (uint16_t y = surface_handle->dirty_t; y <= surface_handle->dirty_b; ++y) {
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for (uint16_t x = surface_handle->dirty_l; x <= surface_handle->dirty_r; ++x) {
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// Update the target buffer
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target_buffer[pixel_counter++] = surface_handle->buffer[y * surface_handle->base.panel_width + x];
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// If we've accumulated enough data, send it
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if (pixel_counter == total_pixel_count) {
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ok = qp_pixdata(display, qp_internal_global_pixdata_buffer, pixel_counter);
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if (!ok) {
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return false;
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}
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// Reset the counter
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pixel_counter = 0;
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}
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}
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}
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// If there's any leftover data, send it
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if (pixel_counter > 0) {
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ok = qp_pixdata(display, qp_internal_global_pixdata_buffer, pixel_counter);
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if (!ok) {
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return false;
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}
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}
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// Clear the dirty info for the surface
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return qp_flush(surface);
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}
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