62 lines
2.2 KiB
C
62 lines
2.2 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 "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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//Image has an 8x8 pixel margin, so we can also resolve e.g. [-3, 243]
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x+=8;
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y+=8;
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return pixels[y][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++) xofs[x]=sin(frame*0.15+x*0.06)*4;
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for (int y=0; y<240; y++) yofs[y]=sin(frame*0.1+y*0.05)*4;
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for (int x=0; x<320; x++) xcomp[x]=sin(frame*0.11+x*0.12)*4;
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for (int y=0; y<240; y++) ycomp[y]=sin(frame*0.07+y*0.15)*4;
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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()
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{
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return decode_image(&pixels);
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}
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