dsx2016/phtotest
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Keep album full-screen after GIF and reduce motion-region flicker.

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Unify STRETCH layout for all photos, decode GIF 1:1 with disposal restore, and ship a 160x120 sample GIF.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
DESKTOP-PUHFO60\dsx2016
2026-10-19 18:29:16 +08:00
parent 083a197108
commit 4bd97975eb
8 changed files with 91 additions and 73 deletions
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106
src/photo_view.cpp
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@@ -271,60 +271,76 @@ static int32_t gif_seek(GIFFILE *pFile, int32_t iPosition) {
return pFile->iPos;
}
// GIF disposal tracking (apply previous frame's disposal at start of next frame).
static uint8_t g_gif_pend_disposal = 0;
static int16_t g_gif_pend_x = 0;
static int16_t g_gif_pend_y = 0;
static int16_t g_gif_pend_w = 0;
static int16_t g_gif_pend_h = 0;
static uint16_t g_gif_bg565 = 0x0000;
static void gif_fill_rect(uint16_t *dst, int x0, int y0, int w, int h,
uint16_t color) {
if (!dst || w <= 0 || h <= 0) {
return;
}
for (int y = y0; y < y0 + h; y++) {
if (y < 0 || y >= (int)CANVAS_H) {
continue;
}
for (int x = x0; x < x0 + w; x++) {
if (x < 0 || x >= (int)CANVAS_W) {
continue;
}
dst[(size_t)y * CANVAS_W + (size_t)x] = color;
}
}
}
// 1:1 blit into canvas (centered / clipped). No per-frame downscale — that
// caused moving-region flicker with disposal + transparency.
static void gif_draw(GIFDRAW *pDraw) {
if (!pDraw || !g_draw_dst || g_src_w <= 0 || g_dst_w <= 0) {
if (!pDraw || !g_draw_dst || g_src_w <= 0) {
return;
}
if (g_gif_stop) {
return;
}
const int src_y = pDraw->iY + pDraw->y;
uint16_t *dst = g_draw_dst;
// Fast path: 1:1 into canvas region
if (g_src_w == g_dst_w && g_src_h == g_dst_h) {
const int y = g_off_y + src_y;
if (y < 0 || y >= (int)CANVAS_H) {
return;
if (pDraw->y == 0) {
// Restore previous frame rect to background before drawing this frame.
if (g_gif_pend_disposal == 2) {
gif_fill_rect(dst, g_gif_pend_x, g_gif_pend_y, g_gif_pend_w, g_gif_pend_h,
g_gif_bg565);
}
uint16_t *row = dst + (size_t)y * CANVAS_W + (size_t)g_off_x + pDraw->iX;
for (int x = 0; x < pDraw->iWidth; x++) {
const uint8_t idx = pDraw->pPixels[x];
if (pDraw->ucHasTransparency && idx == pDraw->ucTransparent) {
continue;
}
row[x] = pDraw->pPalette[idx];
g_gif_pend_disposal = pDraw->ucDisposalMethod;
g_gif_pend_x = (int16_t)(g_off_x + pDraw->iX);
g_gif_pend_y = (int16_t)(g_off_y + pDraw->iY);
g_gif_pend_w = (int16_t)pDraw->iWidth;
g_gif_pend_h = (int16_t)pDraw->iHeight;
if (pDraw->pPalette) {
g_gif_bg565 = pDraw->pPalette[pDraw->ucBackground];
}
}
const int y = g_off_y + pDraw->iY + pDraw->y;
if (y < 0 || y >= (int)CANVAS_H) {
return;
}
// Scaled: only dest rows that sample this source line
int dy = 0;
while (dy < g_dst_h && (dy * g_src_h) / g_dst_h < src_y) {
dy++;
}
while (dy < g_dst_h && (dy * g_src_h) / g_dst_h == src_y) {
const int y = g_off_y + dy;
if (y >= 0 && y < (int)CANVAS_H) {
for (int dx = 0; dx < g_dst_w; dx++) {
const int sx = (dx * g_src_w) / g_dst_w;
const int lx = sx - pDraw->iX;
if (lx < 0 || lx >= pDraw->iWidth) {
continue;
}
const uint8_t idx = pDraw->pPixels[lx];
if (pDraw->ucHasTransparency && idx == pDraw->ucTransparent) {
continue;
}
const int x = g_off_x + dx;
if (x < 0 || x >= (int)CANVAS_W) {
continue;
}
dst[(size_t)y * CANVAS_W + (size_t)x] = pDraw->pPalette[idx];
}
const int x0 = g_off_x + pDraw->iX;
for (int i = 0; i < pDraw->iWidth; i++) {
const int x = x0 + i;
if (x < 0 || x >= (int)CANVAS_W) {
continue;
}
dy++;
const uint8_t idx = pDraw->pPixels[i];
if (pDraw->ucHasTransparency && idx == pDraw->ucTransparent) {
continue;
}
dst[(size_t)y * CANVAS_W + (size_t)x] = pDraw->pPalette[idx];
}
}
@@ -381,12 +397,16 @@ static void gif_task(void * /*arg*/) {
continue;
}
g_dst_w = CANVAS_W;
g_dst_h = CANVAS_H;
// 1:1 into canvas (center; clip if GIF larger than 160x120).
g_off_x = ((int)CANVAS_W - g_src_w) / 2;
g_off_y = ((int)CANVAS_H - g_src_h) / 2;
g_dst_w = g_src_w;
g_dst_h = g_src_h;
g_img_w = CANVAS_W;
g_img_h = CANVAS_H;
g_off_x = 0;
g_off_y = 0;
g_gif_pend_disposal = 0;
g_gif_pend_w = 0;
g_gif_pend_h = 0;
// Double-buffer: show A, decode into B (B starts as copy of A).
g_show = g_pixels;