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Pico Graphics: Double buffer scanline conversion

pull/422/head
Mike Bell 2022-07-02 11:49:16 +01:00 zatwierdzone przez Mike Bell
rodzic 05ef0d7f03
commit f341c15fa7
3 zmienionych plików z 18 dodań i 15 usunięć
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11
libraries/pico_graphics/pico_graphics_pen_p4.cpp
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@ -135,8 +135,9 @@ namespace pimoroni {
// Treat our void* frame_buffer as uint8_t // Treat our void* frame_buffer as uint8_t
uint8_t *src = (uint8_t *)frame_buffer; uint8_t *src = (uint8_t *)frame_buffer;
// Allocate a per-row temporary buffer // Allocate two per-row temporary buffers, as the callback may transfer by DMA
uint16_t row_buf[bounds.w]; // while we're preparing the next row
uint16_t row_buf[2][bounds.w];
for(auto y = 0; y < bounds.h; y++) { for(auto y = 0; y < bounds.h; y++) {
/*if(scanline_interrupt != nullptr) { /*if(scanline_interrupt != nullptr) {
scanline_interrupt(y); scanline_interrupt(y);
@ -150,11 +151,11 @@ namespace pimoroni {
uint8_t c = src[(bounds.w * y / 2) + (x / 2)]; uint8_t c = src[(bounds.w * y / 2) + (x / 2)];
uint8_t o = (~x & 0b1) * 4; // bit offset within byte uint8_t o = (~x & 0b1) * 4; // bit offset within byte
uint8_t b = (c >> o) & 0xf; // bit value shifted to position uint8_t b = (c >> o) & 0xf; // bit value shifted to position
row_buf[x] = cache[b]; row_buf[y & 1][x] = cache[b];
} }
// Callback to the driver with the row data // Callback to the driver with the row data
callback(row_buf, bounds.w * sizeof(RGB565)); callback(row_buf[y & 1], bounds.w * sizeof(RGB565));
} }
} }
} }
} }

11
libraries/pico_graphics/pico_graphics_pen_p8.cpp
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@ -109,15 +109,16 @@ namespace pimoroni {
// Treat our void* frame_buffer as uint8_t // Treat our void* frame_buffer as uint8_t
uint8_t *src = (uint8_t *)frame_buffer; uint8_t *src = (uint8_t *)frame_buffer;
// Allocate a per-row temporary buffer // Allocate two per-row temporary buffers, as the callback may transfer by DMA
uint16_t row_buf[bounds.w]; // while we're preparing the next row
uint16_t row_buf[2][bounds.w];
for(auto y = 0; y < bounds.h; y++) { for(auto y = 0; y < bounds.h; y++) {
for(auto x = 0; x < bounds.w; x++) { for(auto x = 0; x < bounds.w; x++) {
row_buf[x] = cache[src[bounds.w * y + x]]; row_buf[y & 1][x] = cache[src[bounds.w * y + x]];
} }
// Callback to the driver with the row data // Callback to the driver with the row data
callback(row_buf, bounds.w * sizeof(RGB565)); callback(row_buf[y & 1], bounds.w * sizeof(RGB565));
} }
} }
} }
} }

11
libraries/pico_graphics/pico_graphics_pen_rgb332.cpp
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@ -84,16 +84,17 @@ namespace pimoroni {
// Treat our void* frame_buffer as uint8_t // Treat our void* frame_buffer as uint8_t
uint8_t *src = (uint8_t *)frame_buffer; uint8_t *src = (uint8_t *)frame_buffer;
// Allocate a per-row temporary buffer // Allocate two per-row temporary buffers, as the callback may transfer by DMA
uint16_t row_buf[bounds.w]; // while we're preparing the next row
uint16_t row_buf[2][bounds.w];
for(auto y = 0; y < bounds.h; y++) { for(auto y = 0; y < bounds.h; y++) {
for(auto x = 0; x < bounds.w; x++) { for(auto x = 0; x < bounds.w; x++) {
row_buf[x] = rgb332_to_rgb565_lut[*src]; row_buf[y & 1][x] = rgb332_to_rgb565_lut[*src];
src++; src++;
} }
// Callback to the driver with the row data // Callback to the driver with the row data
callback(row_buf, bounds.w * sizeof(RGB565)); callback(row_buf[y & 1], bounds.w * sizeof(RGB565));
} }
} }
} }
@ -118,4 +119,4 @@ namespace pimoroni {
} }
} }
} }
} }