esqueleto nivel 1

source/core/rendering/sprites/dissolve_sprite.cpp

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+#include "core/rendering/sprites/dissolve_sprite.hpp"
+
+#include <algorithm>  // Para min
+#include <cstdint>    // Para uint32_t
+
+#include "core/rendering/surface.hpp"  // Para Surface
+
+// Hash 2D estable per a dithering (rank aleatori per posició de píxel)
+static auto pixelRank(int col, int row) -> float {
+    auto h = (static_cast<uint32_t>(col) * 2246822519U) ^ (static_cast<uint32_t>(row) * 2654435761U);
+    h ^= (h >> 13);
+    h *= 1274126177U;
+    h ^= (h >> 16);
+    return static_cast<float>(h & 0xFFFFU) / 65536.0F;
+}
+
+// Rang per a un píxel tenint en compte direcció (70% direccional + 30% aleatori)
+auto DissolveSprite::computePixelRank(int col, int row, int frame_h, DissolveDirection dir) -> float {
+    const float RANDOM = pixelRank(col, row);
+    if (dir == DissolveDirection::NONE || frame_h <= 0) {
+        return RANDOM;
+    }
+
+    float y_factor = 0.0F;
+    if (dir == DissolveDirection::DOWN) {
+        y_factor = static_cast<float>(row) / static_cast<float>(frame_h);
+    } else {
+        y_factor = static_cast<float>(frame_h - 1 - row) / static_cast<float>(frame_h);
+    }
+
+    return (y_factor * 0.7F) + (RANDOM * 0.3F);
+}
+
+// Constructor per a surface directa (sense AnimationResource)
+DissolveSprite::DissolveSprite(std::shared_ptr<Surface> surface, SDL_FRect pos)
+    : AnimatedSprite(std::move(surface), pos) {
+    if (surface_) {
+        const int W = static_cast<int>(surface_->getWidth());
+        const int H = static_cast<int>(surface_->getHeight());
+        surface_display_ = std::make_shared<Surface>(W, H);
+        surface_display_->setTransparentColor(surface_->getTransparentColor());
+        surface_display_->clear(surface_->getTransparentColor());
+    }
+}
+
+// Constructor
+DissolveSprite::DissolveSprite(const AnimationResource& data)
+    : AnimatedSprite(data) {
+    if (surface_) {
+        const int W = static_cast<int>(surface_->getWidth());
+        const int H = static_cast<int>(surface_->getHeight());
+        surface_display_ = std::make_shared<Surface>(W, H);
+        surface_display_->setTransparentColor(surface_->getTransparentColor());
+        // Inicialitza tots els píxels com a transparents
+        surface_display_->clear(surface_->getTransparentColor());
+    }
+}
+
+// Reconstrueix la surface_display_ filtrant píxels per progress_
+void DissolveSprite::rebuildDisplaySurface() {
+    if (!surface_ || !surface_display_) {
+        return;
+    }
+
+    const SDL_FRect CLIP = clip_;
+    const int SX = static_cast<int>(CLIP.x);
+    const int SY = static_cast<int>(CLIP.y);
+    const int SW = static_cast<int>(CLIP.w);
+    const int SH = static_cast<int>(CLIP.h);
+
+    if (SW <= 0 || SH <= 0) {
+        return;
+    }
+
+    auto src_data = surface_->getSurfaceData();
+    auto dst_data = surface_display_->getSurfaceData();
+
+    const int SRC_W = static_cast<int>(src_data->width);
+    const int DST_W = static_cast<int>(dst_data->width);
+    const Uint8 TRANSPARENT = surface_->getTransparentColor();
+
+    // Esborra frame anterior si ha canviat
+    if (prev_clip_.w > 0 && prev_clip_.h > 0 &&
+        (prev_clip_.x != CLIP.x || prev_clip_.y != CLIP.y ||
+            prev_clip_.w != CLIP.w || prev_clip_.h != CLIP.h)) {
+        surface_display_->fillRect(&prev_clip_, TRANSPARENT);
+    }
+
+    // Esborra la zona del frame actual (reconstrucció neta)
+    surface_display_->fillRect(&CLIP, TRANSPARENT);
+
+    // Copia píxels filtrats per progress_
+    for (int row = 0; row < SH; ++row) {
+        for (int col = 0; col < SW; ++col) {
+            const Uint8 COLOR = src_data->data[((SY + row) * SRC_W) + (SX + col)];
+            if (COLOR == TRANSPARENT) {
+                continue;
+            }
+            const float RANK = computePixelRank(col, row, SH, direction_);
+            if (RANK >= progress_) {
+                const Uint8 OUT = (COLOR == source_color_) ? target_color_ : COLOR;
+                dst_data->data[((SY + row) * DST_W) + (SX + col)] = OUT;
+            }
+        }
+    }
+
+    prev_clip_ = CLIP;
+    needs_rebuild_ = false;
+}
+
+// Actualitza animació, moviment i transició temporal
+void DissolveSprite::update(float delta_time) {
+    const SDL_FRect OLD_CLIP = clip_;
+    AnimatedSprite::update(delta_time);
+
+    // Detecta canvi de frame d'animació
+    if (clip_.x != OLD_CLIP.x || clip_.y != OLD_CLIP.y ||
+        clip_.w != OLD_CLIP.w || clip_.h != OLD_CLIP.h) {
+        needs_rebuild_ = true;
+    }
+
+    // Actualitza transició temporal si activa
+    if (transition_mode_ != TransitionMode::NONE) {
+        transition_elapsed_ += delta_time * 1000.0F;
+        const float T = std::min(transition_elapsed_ / transition_duration_, 1.0F);
+        progress_ = (transition_mode_ == TransitionMode::DISSOLVING) ? T : (1.0F - T);
+        needs_rebuild_ = true;
+        if (T >= 1.0F) {
+            transition_mode_ = TransitionMode::NONE;
+        }
+    }
+
+    if (needs_rebuild_) {
+        rebuildDisplaySurface();
+    }
+}
+
+// Renderitza: usa surface_display_ (amb color replace) si disponible
+void DissolveSprite::render() {
+    if (!surface_display_) {
+        AnimatedSprite::render();
+        return;
+    }
+    surface_display_->render(static_cast<int>(pos_.x), static_cast<int>(pos_.y), &clip_, flip_);
+}
+
+// Estableix el progrés manualment
+void DissolveSprite::setProgress(float progress) {
+    progress_ = std::min(std::max(progress, 0.0F), 1.0F);
+    needs_rebuild_ = true;
+}
+
+// Inicia dissolució temporal (visible → invisible)
+void DissolveSprite::startDissolve(float duration_ms, DissolveDirection dir) {
+    direction_ = dir;
+    transition_mode_ = TransitionMode::DISSOLVING;
+    transition_duration_ = duration_ms;
+    transition_elapsed_ = 0.0F;
+    progress_ = 0.0F;
+    needs_rebuild_ = true;
+}
+
+// Inicia generació temporal (invisible → visible)
+void DissolveSprite::startGenerate(float duration_ms, DissolveDirection dir) {
+    direction_ = dir;
+    transition_mode_ = TransitionMode::GENERATING;
+    transition_duration_ = duration_ms;
+    transition_elapsed_ = 0.0F;
+    progress_ = 1.0F;
+    needs_rebuild_ = true;
+}
+
+// Atura la transició temporal
+void DissolveSprite::stopTransition() {
+    transition_mode_ = TransitionMode::NONE;
+}
+
+// Retorna si la transició ha acabat
+auto DissolveSprite::isTransitionDone() const -> bool {
+    return transition_mode_ == TransitionMode::NONE;
+}
+
+// Configura substitució de color per a la reconstrucció
+void DissolveSprite::setColorReplace(Uint8 source, Uint8 target) {
+    source_color_ = source;
+    target_color_ = target;
+    needs_rebuild_ = true;
+}