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67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/*
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This code generates an effect that should pass the 'fancy graphics' qualification
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as set in the comment in the spi_master code.
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <math.h>
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#include "pretty_effect.h"
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#include "sdkconfig.h"
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#include "decode_image.h"
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uint16_t *pixels;
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//Grab a rgb16 pixel from the esp32_tiles image
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static inline uint16_t get_bgnd_pixel(int x, int y)
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{
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//Get color of the pixel on x,y coords
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return (uint16_t) * (pixels + (y * IMAGE_W) + x);
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}
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//This variable is used to detect the next frame.
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static int prev_frame = -1;
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//Instead of calculating the offsets for each pixel we grab, we pre-calculate the valueswhenever a frame changes, then re-use
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//these as we go through all the pixels in the frame. This is much, much faster.
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static int8_t xofs[320], yofs[240];
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static int8_t xcomp[320], ycomp[240];
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//Calculate the pixel data for a set of lines (with implied line size of 320). Pixels go in dest, line is the Y-coordinate of the
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//first line to be calculated, linect is the amount of lines to calculate. Frame increases by one every time the entire image
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//is displayed; this is used to go to the next frame of animation.
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void pretty_effect_calc_lines(uint16_t *dest, int line, int frame, int linect)
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{
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if (frame != prev_frame) {
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//We need to calculate a new set of offset coefficients. Take some random sines as offsets to make everything
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//look pretty and fluid-y.
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for (int x = 0; x < 320; x++) {
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xofs[x] = sin(frame * 0.15 + x * 0.06) * 4;
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}
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for (int y = 0; y < 240; y++) {
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yofs[y] = sin(frame * 0.1 + y * 0.05) * 4;
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}
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for (int x = 0; x < 320; x++) {
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xcomp[x] = sin(frame * 0.11 + x * 0.12) * 4;
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}
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for (int y = 0; y < 240; y++) {
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ycomp[y] = sin(frame * 0.07 + y * 0.15) * 4;
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}
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prev_frame = frame;
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}
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for (int y = line; y < line + linect; y++) {
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for (int x = 0; x < 320; x++) {
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*dest++ = get_bgnd_pixel(x + yofs[y] + xcomp[x], y + xofs[x] + ycomp[y]);
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}
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}
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}
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esp_err_t pretty_effect_init(void)
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{
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return decode_image(&pixels);
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}
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