74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
#include "Display_PNG.h"
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static PNG png;
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static File Image_file;
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static int16_t xpos = 0;
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static int16_t ypos = 0;
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// ── PNG callbacks ─────────────────────────────────────────────────────────────
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static void* pngOpen(const char* filePath, int32_t* size) {
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Image_file = SD_MMC.open(filePath);
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if (!Image_file) { printf("PNG: failed to open %s\r\n", filePath); return nullptr; }
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*size = Image_file.size();
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return &Image_file;
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}
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static void pngClose(void* handle) {
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File* fp = (File*)handle;
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if (fp && *fp) fp->close();
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}
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static int32_t pngRead(PNGFILE* page, uint8_t* buffer, int32_t length) {
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if (!Image_file) return 0;
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return Image_file.read(buffer, length);
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}
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static int32_t pngSeek(PNGFILE* page, int32_t position) {
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if (!Image_file) return 0;
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return Image_file.seek(position);
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}
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static uint16_t lineBuffer[MAX_IMAGE_WIDTH];
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static void pngDraw(PNGDRAW* pDraw) {
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png.getLineAsRGB565(pDraw, lineBuffer, PNG_RGB565_BIG_ENDIAN, 0xffffffff);
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uint32_t w = pDraw->iWidth;
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for (size_t i = 0; i < w; i++) lineBuffer[i] = __builtin_bswap16(lineBuffer[i]);
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LCD_addWindow(xpos, pDraw->y, xpos + w - 1, ypos + pDraw->y, lineBuffer);
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}
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// ── Screen fill ───────────────────────────────────────────────────────────────
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static void clearScreen() {
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static uint16_t blackLine[MAX_IMAGE_WIDTH];
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memset(blackLine, 0, sizeof(blackLine));
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for (int y = 0; y < LCD_HEIGHT; y++)
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LCD_addWindow(0, y, LCD_WIDTH - 1, y, blackLine);
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}
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// ── Public API ────────────────────────────────────────────────────────────────
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void Display_Image_From_SD(const char* fullPath) {
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printf("PNG: loading %s\r\n", fullPath);
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int16_t rc = png.open(fullPath, pngOpen, pngClose, pngRead, pngSeek, pngDraw);
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if (rc != PNG_SUCCESS) {
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printf("PNG: open failed, rc=%d\r\n", rc);
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return;
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}
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if (png.getWidth() > MAX_IMAGE_WIDTH) {
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printf("PNG: image too wide (%d px)\r\n", png.getWidth());
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png.close();
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return;
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}
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clearScreen();
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png.decode(NULL, 0);
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png.close();
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}
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void Display_Memory_Photo(int memoryIndex) {
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if (memoryIndex < 0 || memoryIndex >= g_memoryCount) {
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printf("PNG: invalid memory index %d\r\n", memoryIndex);
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return;
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}
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char path[120];
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snprintf(path, sizeof(path), "/photos/%s", g_memories[memoryIndex].photo);
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Display_Image_From_SD(path);
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}
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